422 lines
17 KiB
JSON
422 lines
17 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-20051",
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"assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
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"state": "PUBLISHED",
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"assignerShortName": "cisco",
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"dateReserved": "2025-10-08T11:59:15.355Z",
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"datePublished": "2026-02-25T16:14:33.859Z",
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"dateUpdated": "2026-02-25T19:05:49.650Z"
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},
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"containers": {
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"cna": {
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"title": "Cisco Nexus 3600-R and 9500-R Series Switching Platforms Layer 2 Loop Denial of Service Vulnerability",
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"metrics": [
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{
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"format": "cvssV3_1",
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
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"baseScore": 7.4,
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"baseSeverity": "HIGH",
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"attackVector": "ADJACENT_NETWORK",
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"attackComplexity": "LOW",
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"privilegesRequired": "NONE",
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"userInteraction": "NONE",
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"scope": "CHANGED",
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"confidentialityImpact": "NONE",
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"integrityImpact": "NONE",
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"availabilityImpact": "HIGH"
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}
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}
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],
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"descriptions": [
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{
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"lang": "en",
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"value": "A vulnerability with the Ethernet VPN (EVPN) Layer 2 ingress packet processing of Cisco Nexus 3600 Platform Switches and Cisco Nexus 9500-R Series Switching Platforms could allow an unauthenticated, adjacent attacker to trigger a Layer 2 traffic loop.\r\n\r\nThis vulnerability is due to a logic error when processing a crafted Layer 2 ingress frame. An attacker could exploit this vulnerability by sending a stream of crafted Ethernet frames through the targeted device. A successful exploit could allow the attacker to cause a Layer 2 Virtual eXtensible LAN (VxLAN) traffic loop, which, in turn, could result in a denial of service (DoS) condition. This Layer 2 loop could oversubscribe the bandwidth on network interfaces, which would result in all data plane traffic being dropped. To exploit this vulnerability, the attacker must be Layer 2-adjacent to the affected device.\r\nNote: To stop active exploitation of this vulnerability, manual intervention is required to both stop the crafted traffic and flap all involved network interfaces. For additional assistance if a Layer 2 loop that is related to this vulnerability is suspected, contact the Cisco Technical Assistance Center (TAC) or the proper support provider. "
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}
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],
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"references": [
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{
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"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-ether-dos-Kv8YNWZ4",
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"name": "cisco-sa-nxos-ether-dos-Kv8YNWZ4"
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}
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],
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"exploits": [
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{
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"lang": "en",
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"value": "The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory."
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}
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],
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"source": {
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"advisory": "cisco-sa-nxos-ether-dos-Kv8YNWZ4",
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"discovery": "EXTERNAL",
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"defects": [
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"CSCwo94451"
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]
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},
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"problemTypes": [
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{
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"descriptions": [
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{
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"lang": "en",
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"description": "Use of Uninitialized Variable",
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"type": "cwe",
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"cweId": "CWE-457"
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}
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]
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}
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],
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"affected": [
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{
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"vendor": "Cisco",
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"product": "Cisco NX-OS Software",
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"versions": [
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{
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"version": "9.2(3)",
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"status": "affected"
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},
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{
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"version": "9.2(2v)",
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"status": "affected"
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},
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{
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"version": "9.2(1)",
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"status": "affected"
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},
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{
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"version": "9.2(2t)",
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"status": "affected"
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},
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{
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"version": "9.2(3y)",
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"status": "affected"
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},
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{
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"version": "9.3(2)",
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"status": "affected"
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},
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{
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"version": "9.2(4)",
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"status": "affected"
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},
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{
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"version": "9.3(1)",
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"status": "affected"
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},
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{
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"version": "9.3(1z)",
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"status": "affected"
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},
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{
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"version": "9.2(2)",
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"status": "affected"
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},
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{
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"version": "9.3(3)",
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"status": "affected"
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},
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{
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"version": "9.3(4)",
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"status": "affected"
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},
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{
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"version": "9.3(5)",
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"status": "affected"
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},
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{
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"version": "9.3(6)",
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"status": "affected"
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},
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{
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"version": "9.3(5w)",
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"status": "affected"
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},
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{
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"version": "9.3(7)",
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"status": "affected"
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},
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{
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"version": "9.3(7k)",
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"status": "affected"
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},
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{
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"version": "10.2(1)",
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"status": "affected"
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},
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{
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"version": "9.3(7a)",
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"status": "affected"
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},
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{
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"version": "9.3(8)",
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"status": "affected"
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},
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{
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"version": "10.2(1q)",
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"status": "affected"
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},
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{
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"version": "10.2(2)",
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"status": "affected"
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},
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{
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"version": "9.3(9)",
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"status": "affected"
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},
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{
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"version": "10.2(3)",
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"status": "affected"
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},
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{
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"version": "10.2(3t)",
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"status": "affected"
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},
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{
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"version": "9.3(10)",
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"status": "affected"
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},
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{
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"version": "10.2(2a)",
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"status": "affected"
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},
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{
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"version": "10.3(1)",
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"status": "affected"
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},
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{
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"version": "10.2(4)",
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"status": "affected"
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},
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{
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"version": "10.3(2)",
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"status": "affected"
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},
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{
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"version": "9.3(11)",
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"status": "affected"
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},
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{
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"version": "10.3(3)",
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"status": "affected"
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},
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{
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"version": "10.2(5)",
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"status": "affected"
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},
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{
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"version": "9.3(12)",
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"status": "affected"
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},
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{
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"version": "10.2(3v)",
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"status": "affected"
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},
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{
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"version": "10.4(1)",
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"status": "affected"
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},
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{
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"version": "10.2(6)",
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"status": "affected"
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},
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{
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"version": "10.3(3w)",
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"status": "affected"
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},
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{
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"version": "10.3(3o)",
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"status": "affected"
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},
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{
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"version": "10.3(4)",
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"status": "affected"
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},
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{
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"version": "10.3(3p)",
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"status": "affected"
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},
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{
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"version": "10.3(4a)",
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"status": "affected"
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},
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{
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"version": "10.4(2)",
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"status": "affected"
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},
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{
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"version": "10.3(3q)",
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"status": "affected"
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},
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{
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"version": "9.3(13)",
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"status": "affected"
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{
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"version": "10.3(5)",
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"status": "affected"
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},
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{
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"version": "10.2(7)",
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"status": "affected"
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},
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{
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"version": "10.4(3)",
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"status": "affected"
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{
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"version": "10.3(3x)",
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"status": "affected"
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},
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{
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"version": "10.3(4g)",
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"status": "affected"
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{
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"version": "10.5(1)",
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"status": "affected"
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},
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{
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"version": "10.2(8)",
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"status": "affected"
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},
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{
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"version": "10.3(3r)",
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"status": "affected"
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},
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{
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"version": "10.3(6)",
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"status": "affected"
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},
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{
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"version": "9.3(14)",
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"status": "affected"
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},
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{
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"version": "10.4(4)",
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"status": "affected"
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},
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{
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"version": "10.3(4h)",
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"status": "affected"
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},
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{
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"version": "10.5(2)",
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"status": "affected"
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},
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{
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"version": "10.3(7)",
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"status": "affected"
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},
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{
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"version": "10.4(5)",
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"status": "affected"
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},
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{
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"version": "10.5(3)",
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"status": "affected"
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},
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{
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"version": "10.2(9)",
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"status": "affected"
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},
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{
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"version": "9.3(15)",
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"status": "affected"
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},
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{
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"version": "10.4(4g)",
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"status": "affected"
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},
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{
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"version": "10.5(4)",
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"status": "affected"
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},
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{
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"version": "10.6(1)",
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"status": "affected"
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},
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{
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"version": "10.5(3t)",
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"status": "affected"
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},
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{
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"version": "10.3(8)",
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"status": "affected"
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},
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{
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"version": "10.4(6)",
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"status": "affected"
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},
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{
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"version": "10.5(3s)",
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"status": "affected"
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},
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{
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"version": "10.5(3e)",
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"status": "affected"
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},
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{
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"version": "10.5(3o)",
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"status": "affected"
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},
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{
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"version": "9.3(16)",
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"status": "affected"
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},
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{
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"version": "10.6(1s)",
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"status": "affected"
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},
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{
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"version": "10.5(3p)",
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"status": "affected"
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}
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],
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"defaultStatus": "unknown"
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}
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],
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"providerMetadata": {
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"orgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
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"shortName": "cisco",
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"dateUpdated": "2026-02-25T16:14:33.859Z"
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}
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},
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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2026-20051",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-02-25T18:18:59.463626Z"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-02-25T19:05:49.650Z"
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}
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}
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]
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}
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} |