268 lines
18 KiB
JSON
268 lines
18 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-2026-73440",
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"assignerOrgId": "c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7",
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"state": "PUBLISHED",
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"assignerShortName": "Arista",
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"dateReserved": "2026-08-12T16:39:35.977Z",
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"datePublished": "2026-09-16T09:55:14.571Z",
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"dateUpdated": "2026-11-08T10:31:44.396Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7",
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"shortName": "Arista",
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"dateUpdated": "2026-11-08T10:31:44.396Z"
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},
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"title": "Security Advisory 0178",
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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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"cweId": "CWE-212",
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"description": "CWE-212 Improper Removal of Sensitive Information Before Storage or Transfer",
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"type": "CWE"
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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": "Arista Networks",
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"product": "EOS",
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"platforms": [
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"710 Series",
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"720D Series",
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"720XP/722XPM Series",
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"750X Series",
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"7010TX Series",
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"7020R/R4 Series",
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"7130 Series running EOS",
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"7150 Series",
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"7170 Series",
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"7050X3/X4 Series",
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"7060X/X2/X4/X5/X6 Series",
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"7260X/X3 Series",
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"7280R/R2/R3/R4 Series",
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"7300X/X3 Series",
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"7320X Series",
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"7358X4 Series",
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"7368X4 Series",
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"7388X5 Series",
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"7500R/R2/R3 Series",
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"7800R3/R4 Series",
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"7700R4 Series",
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"AWE 5000 Series",
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"AWE 7200R Series",
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"CloudEOS",
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"cEOS-lab",
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"vEOS-lab",
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"CloudVision eXchange",
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"virtual or physical appliance"
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],
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"versions": [
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{
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"status": "affected",
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"version": "4.36.0F",
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"lessThanOrEqual": "4.36.2F",
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"versionType": "custom"
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},
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{
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"status": "affected",
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"version": "4.35.0F",
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"lessThanOrEqual": "4.35.6M",
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"versionType": "custom"
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},
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{
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"status": "affected",
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"version": "4.34.0F",
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"lessThanOrEqual": "4.34.8M",
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"versionType": "custom"
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},
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{
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"status": "affected",
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"version": "4.33.0F",
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"lessThanOrEqual": "4.33.10M",
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"versionType": "custom"
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},
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{
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"status": "affected",
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"version": "1.0.0",
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"lessThan": "4.33.0F",
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"versionType": "custom"
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}
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],
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"defaultStatus": "unaffected"
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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": "On affected platforms running Arista EOS with Simple Network Management Protocol (SNMP) configured, SNMPv3 local or remote user credentials may be exposed as a one-way hashed, localized key value within the device's running and sanitized configurations. An authenticated user who gains access to this sensitive information could leverage it to perform unauthorized read operations on SNMP tables or to send fraudulent trap notifications to the Network Management System (NMS).\n\n\n\nThis issue was discovered internally by Arista, and the company is not aware of any malicious exploitation of this vulnerability in customer networks.",
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"supportingMedia": [
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{
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"type": "text/html",
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"base64": false,
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"value": "<p>On affected platforms running Arista EOS with Simple Network Management Protocol (SNMP) configured, SNMPv3 local or remote user credentials may be exposed as a one-way hashed, localized key value within the device's running and sanitized configurations. An authenticated user who gains access to this sensitive information could leverage it to perform unauthorized read operations on SNMP tables or to send fraudulent trap notifications to the Network Management System (NMS).</p><p>This issue was discovered internally by Arista, and the company is not aware of any malicious exploitation of this vulnerability in customer networks.</p>"
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}
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]
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}
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],
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"references": [
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{
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"url": "https://www.arista.com/en/support/advisories-notices/security-advisory/24734-security-advisory-0178",
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"name": "Security Advisory 0178",
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"tags": [
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"vendor-advisory"
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]
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}
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],
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"metrics": [
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{
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"format": "CVSS",
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"scenarios": [
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{
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"lang": "en",
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"value": "GENERAL"
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}
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],
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"cvssV3_1": {
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"version": "3.1",
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"attackVector": "NETWORK",
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"attackComplexity": "HIGH",
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"privilegesRequired": "LOW",
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"userInteraction": "NONE",
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"scope": "UNCHANGED",
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"confidentialityImpact": "LOW",
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"integrityImpact": "LOW",
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"availabilityImpact": "NONE",
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"baseSeverity": "MEDIUM",
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"baseScore": 4.2,
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"vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N"
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}
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},
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{
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"format": "CVSS",
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"scenarios": [
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{
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"lang": "en",
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"value": "GENERAL"
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}
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],
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"cvssV4_0": {
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"attackVector": "NETWORK",
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"attackComplexity": "LOW",
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"attackRequirements": "PRESENT",
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"privilegesRequired": "LOW",
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"userInteraction": "NONE",
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"vulnConfidentialityImpact": "LOW",
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"subConfidentialityImpact": "NONE",
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"vulnIntegrityImpact": "LOW",
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"subIntegrityImpact": "NONE",
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"vulnAvailabilityImpact": "NONE",
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"subAvailabilityImpact": "NONE",
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"exploitMaturity": "NOT_DEFINED",
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"Safety": "NOT_DEFINED",
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"Automatable": "NOT_DEFINED",
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"Recovery": "NOT_DEFINED",
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"valueDensity": "NOT_DEFINED",
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"vulnerabilityResponseEffort": "NOT_DEFINED",
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"providerUrgency": "NOT_DEFINED",
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"version": "4.0",
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"baseSeverity": "LOW",
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"baseScore": 2.3,
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"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N"
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}
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}
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],
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"configurations": [
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{
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"lang": "en",
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"value": "In order to be vulnerable to CVE-2026-73440, the following conditions must all be met:\n\n * SNMPv3 must be configured with at least one local or remote user that has an authentication key.\n * The SNMPv3 user CLI configuration uses the legacy syntax and does not include the updated \"key <algo> <encrypted_text>\" syntax.\n\n\n\n\nFor example:\n\n\n\nswitch# show running-config | section snmp-server\nsnmp-server user alice group_alice v3 localized f5717f2cdde9bb946d00 auth sha256 f4b9ec9a299a10a5dec3541f44f44000484254ee56fa404236730520e10ce689\n\n\n\nTo verify whether any SNMPv3 users with authentication are configured:\n\n\n\nswitch# show snmp user\n\nUser name : alice\nSecurity model : v3\nEngine ID : f5717f2cdde9bb946d00\nAuthentication : SHA-256\nPrivacy : None\nGroup : group_alice\n\n\n\nIf SNMP is not configured or no SNMPv3 users are configured, there is no exposure to this issue:\n\n\n\nswitch>show snmp\nChassis: XXXXXXXXXXX\nSNMP agent enabled in VRFs: default\nTransmit message maximum size: 65536\nSNMP agent disabled: Either no communities and no users are configured, or no VRFs are configured.",
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"supportingMedia": [
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{
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"type": "text/html",
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"base64": false,
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"value": "<p>In order to be vulnerable to CVE-2026-73440, the following conditions must all be met:</p><ul><li>SNMPv3 must be configured with at least one local or remote user that has an authentication key.</li><li>The SNMPv3 user CLI configuration uses the legacy syntax and does not include the updated "key <algo> <encrypted_text>" syntax.</li></ul><p>For example:</p><pre>switch# show running-config | section snmp-server\nsnmp-server user alice group_alice v3 localized f5717f2cdde9bb946d00 auth sha256 f4b9ec9a299a10a5dec3541f44f44000484254ee56fa404236730520e10ce689</pre><p>To verify whether any SNMPv3 users with authentication are configured:</p><pre>switch# show snmp user\n\nUser name : alice\nSecurity model : v3\nEngine ID : f5717f2cdde9bb946d00\nAuthentication : SHA-256\nPrivacy : None\nGroup : group_alice</pre><p>If SNMP is not configured or no SNMPv3 users are configured, there is no exposure to this issue:</p><pre>switch>show snmp\nChassis: XXXXXXXXXXX\nSNMP agent enabled in VRFs: default\nTransmit message maximum size: 65536\nSNMP agent disabled: Either no communities and no users are configured, or no VRFs are configured.</pre>"
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}
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]
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}
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],
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"workarounds": [
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{
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"lang": "en",
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"value": "CVE-2026-73440 can be remediated using the hotfix detailed below. This hotfix is strictly applicable to the listed releases. All non-listed versions must be upgraded to a fixed release as specified above.\n\n \n\n * 4.36.2F\n * 4.35.6M\n * 4.34.8M\n * 4.33.10M\n\n\n\n\nPost hotfix installation, users are required to execute the syntax conversion command to fix the malformed keys.\n\n\n\nNote: Installing/uninstalling the SWIX will cause the ConfigAgent process to restart.\n\nVersion: 1.0\nURL: SecurityAdvisory178_CVE-2026-73440_Hotfix.swix https://www.arista.com/support/advisories-notices/sa-download/ \n\n\n\nSWIX hash:\n8a11df104d6ada97f0d63ca87a6a03071524038af1f8cd4a0bbcba490ab80245c7b2cfb86be81c5e6773e05801f3df098120f6053b130938230c79193386fe74\n\n \n\n\n\nFor instructions on installation and verification of the hotfix patch, refer to the “ managing eos extensions https://www.arista.com/en/um-eos/eos-managing-eos-extensions ” section in the EOS User Manual. Ensure that the patch is made persistent across reboots by running the command ‘copy installed-extensions boot-extensions’.",
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"supportingMedia": [
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{
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"type": "text/html",
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"base64": false,
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"value": "<div>CVE-2026-73440 can be remediated using the hotfix detailed below. This hotfix is strictly applicable to the listed releases. All non-listed versions must be upgraded to a fixed release as specified above.</div><div> </div><ul><li>4.36.2F</li><li>4.35.6M</li><li>4.34.8M</li><li>4.33.10M</li></ul><p>Post hotfix installation, users are required to execute the syntax conversion command to fix the malformed keys.</p><p>Note: Installing/uninstalling the SWIX will cause the ConfigAgent process to restart.</p><div>Version: 1.0<br>URL: <a href=\"https://www.arista.com/support/advisories-notices/sa-download/?sa178-SecurityAdvisory178_CVE-2026-73440.swix\">SecurityAdvisory178_CVE-2026-73440_Hotfix.swix</a></div><pre>SWIX hash:<br>8a11df104d6ada97f0d63ca87a6a03071524038af1f8cd4a0bbcba490ab80245c7b2cfb86be81c5e6773e05801f3df098120f6053b130938230c79193386fe74</pre><div> </div><p>For instructions on installation and verification of the hotfix patch, refer to the “<a href=\"https://www.arista.com/en/um-eos/eos-managing-eos-extensions?searchword=eos%20section%206%206%20managing%20eos%20extensions\" target=\"_blank\" rel=\"noopener noreferrer\">managing eos extensions</a>” section in the EOS User Manual. Ensure that the patch is made persistent across reboots by running the command ‘<b>copy installed-extensions boot-extensions</b>’.</p>"
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}
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]
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}
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],
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"solutions": [
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{
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"lang": "en",
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"value": "The recommended resolution is to upgrade to a remediated software version at your earliest convenience. Arista recommends customers move to the latest version of each release that contains all the fixes listed below.\n\n\n\nFollowing the system upgrade, users are required to execute the syntax conversion command specified below to adopt the updated, encrypted SNMPv3 CLI format:\n\n\n\nswitch# configure convert new-syntax\n\n\n\nThe updated encrypted SNMPv3 CLI configuration follows this structure, incorporating the newly introduced \"key <algo> <encrypted_text>\" syntax:\n\n\n\nswitch# show running-config | grep snmp-server\nsnmp-server user alice group_alice v3 localized f5717f2cdde9bb946d00 auth sha256 key 7 005D110205085E520B754E1B591C504542585F557D2F217064607A10034752035500080755575640440F5C00505053515F08525208035C1605525E0A040E781F4D\n\n\n\nCVE-2026-73440 has been fixed in the following releases:\n\n * 4.36.3M and later releases in the 4.36.x train\n * 4.35.7M and later releases in the 4.35.x train\n * 4.34.9M and later releases in the 4.34.x train\n * 4.33.11M and later releases in the 4.33.x train",
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"supportingMedia": [
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{
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"type": "text/html",
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"base64": false,
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"value": "<p>The recommended resolution is to upgrade to a remediated software version at your earliest convenience. Arista recommends customers move to the latest version of each release that contains all the fixes listed below.</p><p>Following the system upgrade, users are required to execute the syntax conversion command specified below to adopt the updated, encrypted SNMPv3 CLI format:</p><pre>switch# configure convert new-syntax</pre><p>The updated encrypted SNMPv3 CLI configuration follows this structure, incorporating the newly introduced \"key <algo> <encrypted_text>\" syntax:</p><pre>switch# show running-config | grep snmp-server\nsnmp-server user alice group_alice v3 localized f5717f2cdde9bb946d00 auth sha256 key 7 005D110205085E520B754E1B591C504542585F557D2F217064607A10034752035500080755575640440F5C00505053515F08525208035C1605525E0A040E781F4D</pre><p>CVE-2026-73440 has been fixed in the following releases:</p><ul><li>4.36.3M and later releases in the 4.36.x train</li><li>4.35.7M and later releases in the 4.35.x train</li><li>4.34.9M and later releases in the 4.34.x train</li><li>4.33.11M and later releases in the 4.33.x train</li></ul>"
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}
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]
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}
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],
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"source": {
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"advisory": "Security Advisory 0178",
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"discovery": "INTERNAL",
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"defects": [
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"BUG 1856462",
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"BUG 1966273"
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]
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},
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"x_generator": {
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"engine": "Vulnogram 1.0.5"
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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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"timestamp": "2026-09-16T13:40:14.055400Z",
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"id": "CVE-2026-73440",
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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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"role": "CISA Coordinator",
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"version": "2.0.3"
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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": "2026-09-16T13:40:25.872Z"
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}
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}
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]
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}
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} |