290 lines
14 KiB
JSON
290 lines
14 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-2026-19655",
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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": "2026-08-12T18:51:29.572Z",
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"datePublished": "2026-09-15T20:56:46.678Z",
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"dateUpdated": "2026-09-16T18:03:27.624Z"
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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": "2026-09-15T20:56:46.678Z"
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},
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"title": "On affected platforms running Arista EOS with Dynamic Host Configuration Protocol (DHCP) relay/snooping configured with the information option (Option 82), or with the DHCP server configured with match criteria based on the information option, an unauthent",
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"datePublic": "2026-09-09T20:56:00.000Z",
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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-20",
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"description": "CWE-20 Improper Input Validation",
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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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"impacts": [
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{
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"capecId": "CAPEC-153",
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"descriptions": [
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{
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"lang": "en",
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"value": "CAPEC-153 Input Data Manipulation"
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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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"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": "4.35.0",
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"lessThanOrEqual": "4.35.5M",
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"changes": [
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{
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"at": "4.35.6M",
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"status": "unaffected"
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}
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],
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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": "4.34.0",
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"lessThanOrEqual": "4.34.7.1M",
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"changes": [
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{
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"at": "4.34.8M",
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"status": "unaffected"
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}
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],
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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": "4.33.0",
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"lessThanOrEqual": "4.33.9M",
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"changes": [
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{
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"at": "4.33.10M",
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"status": "unaffected"
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}
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],
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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 Dynamic Host Configuration Protocol (DHCP) relay/snooping configured with the information option (Option 82), or with the DHCP server configured with match criteria based on the information option, an unauthenticated attacker connected to a client-facing VLAN(s) where the relay is configured can send a specially crafted packet that causes the DHCP Relay service to restart.",
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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 Dynamic Host Configuration Protocol (DHCP) relay/snooping configured with the information option (Option 82), or with the DHCP server configured with match criteria based on the information option, an unauthenticated attacker connected to a client-facing VLAN(s) where the relay is configured can send a specially crafted packet that causes the DHCP Relay service to restart.</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/24711-security-advisory-0155",
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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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"configurations": [
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{
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"lang": "en",
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"value": "In order to be vulnerable to CVE-2026-19655, any of the following conditions must be met:\n\n\n\n1. Configure \"ip dhcp relay\" with the \"information option\" (Option 82) and at least one helper-address on an interface:\n\n\n\ninterface Vlan100\n ip helper-address 1.1.1.2\n ip dhcp relay information option\n\n\n\n2. Configure \"ip dhcp snooping\" with the \"information option\":\n\n\n\nswitch#show running-config | grep snooping\nip dhcp snooping\nip dhcp snooping information option\nip dhcp snooping vlan 100\n\n\n\n3. The DHCP server uses match criteria based on the information option, configured with \"information option arista-switch\" commands:\n\n\n\ndhcp server\n client class ipv4 definition name\n assignments\n private-option 224 always-send type string data \"data1\"\n !\n match\n information option arista-switch Ethernet55/1 vlan 100\n !\n subnet 1.0.0.0/24\n range 1.0.0.1 1.0.0.5\ninterface Vlan10\n dhcp server ipv4",
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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-2026-19655, any of the following conditions must be met:</p><p>1. Configure \"ip dhcp relay\" with the \"information option\" (Option 82) and at least one helper-address on an interface:</p><pre>interface Vlan100\n ip helper-address 1.1.1.2\n ip dhcp relay information option</pre><p>2. Configure \"ip dhcp snooping\" with the \"information option\":</p><pre>switch#show running-config | grep snooping\nip dhcp snooping\nip dhcp snooping information option\nip dhcp snooping vlan 100</pre><p>3. The DHCP server uses match criteria based on the information option, configured with \"information option arista-switch\" commands:</p><pre>dhcp server\n client class ipv4 definition name\n assignments\n private-option 224 always-send type string data \"data1\"\n !\n match\n information option arista-switch Ethernet55/1 vlan 100\n !\n subnet 1.0.0.0/24\n range 1.0.0.1 1.0.0.5\ninterface Vlan10\n dhcp server ipv4</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": "There is no workaround known for this issue.",
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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>There is no workaround known for this issue.</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. CVE-2026-19655 has been fixed in the following releases:\n\n * 4.35.6M and later releases in the 4.35.x train\n * 4.34.8M and later releases in the 4.34.x train\n * 4.33.10M 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. CVE-2026-19655 has been fixed in the following releases:</p><ul><li>4.35.6M and later releases in the 4.35.x train</li><li>4.34.8M and later releases in the 4.34.x train</li><li>4.33.10M 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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"credits": [
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{
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"lang": "en",
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"value": "This issue was discovered internally by Arista.",
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"type": "finder"
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}
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],
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"source": {
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"defect": [
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"1770194"
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],
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"advisory": "155",
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"discovery": "INTERNAL"
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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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"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": "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": "UNCHANGED",
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"confidentialityImpact": "NONE",
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"integrityImpact": "NONE",
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"availabilityImpact": "HIGH",
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"baseSeverity": "MEDIUM",
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"baseScore": 6.5,
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"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
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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": "ADJACENT",
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"attackComplexity": "LOW",
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"attackRequirements": "NONE",
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"privilegesRequired": "NONE",
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"userInteraction": "NONE",
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"vulnConfidentialityImpact": "NONE",
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"subConfidentialityImpact": "NONE",
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"vulnIntegrityImpact": "NONE",
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"subIntegrityImpact": "NONE",
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"vulnAvailabilityImpact": "HIGH",
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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": "HIGH",
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"baseScore": 7.1,
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"vectorString": "CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"
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}
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}
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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": "2026-09-16T18:02:48.292435Z",
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"id": "CVE-2026-19655",
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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": "2026-09-16T18:03:27.624Z"
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}
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}
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]
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}
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} |