261 lines
16 KiB
JSON
261 lines
16 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-2026-73446",
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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": "2026-08-12T16:42:47.920Z",
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"datePublished": "2026-09-15T23:08:19.771Z",
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"dateUpdated": "2026-09-16T19:34:18.384Z"
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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": "2026-09-15T23:08:19.771Z"
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},
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"title": "Security Advisory 0160",
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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-696",
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"description": "CWE-696: Incorrect Behavior Order",
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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-272",
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"descriptions": [
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{
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"lang": "en",
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"value": "CAPEC-272 Protocol 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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"versions": [
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{
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"status": "affected",
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"version": "4.36.0",
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"lessThanOrEqual": "4.36.1F",
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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": "4.35.0",
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"lessThanOrEqual": "4.35.5M",
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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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"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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"versionType": "custom"
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},
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{
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"status": "affected",
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"version": "4.32.0",
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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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"status": "affected",
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"version": "4.31.0",
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"lessThan": "4.32.0F",
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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 IS-IS configured on a broadcast interface, an unauthenticated attacker can send a crafted IS-IS Hello Protocol Data Unit (PDU) that causes the device to tear down an established IS-IS adjacency. This may result in traffic disruption and loss of IP reachability for prefixes advertised through that adjacency.",
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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 IS-IS configured on a broadcast interface, an unauthenticated attacker can send a crafted IS-IS Hello Protocol Data Unit (PDU) that causes the device to tear down an established IS-IS adjacency. This may result in traffic disruption and loss of IP reachability for prefixes advertised through that adjacency.</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/24716-security-advisory-0160",
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"name": "Security Advisory 0160",
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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": "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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"baseSeverity": "HIGH",
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"baseScore": 7.4,
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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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}
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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": "PRESENT",
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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": "HIGH",
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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,
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"vectorString": "CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H"
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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": "IS-IS must be enabled on a broadcast (LAN) interface AND there should be an active IS-IS adjacency on that interface:\n\n\n\nswitch(config-router-isis)#show active\nrouter isis 1\n net 49.0001.1111.1111.1001.00\nswitch(config-if-Et1)#show active\ninterface Ethernet1\n isis enable 1\n\n\n\nswitch#show isis interface detail\nIS-IS Instance: 1 VRF: default\n\n\n Interface Ethernet1:\n Index: 4 SNPA: 2:2:0:1:0:0\n MTU: 1497 Type: broadcast\n Supported address families: IPv4, IPv6\n Area proxy boundary is disabled\n BFD IPv4 is disabled\n BFD IPv6 is disabled\n Hello padding is enabled\n Level 1:\n Metric: 10, Number of adjacencies: 1\n LAN-ID: 1111.1111.1001.04, Priority: 64\n DIS: 1111.1111.1001, DIS priority: 64\n Authentication mode: None\n TI-LFA protection is disabled for IPv4\n TI-LFA protection is disabled for IPv6\n Adjacency 1111.1111.1002:\n State: UP, Level: 1 Type: Level 1 IS\n Advertised hold time: 9\n Neighbor supported address families: IPv4, IPv6\n Address family match: Enabled\n SNPA: 2:2:0:2:0:0, Priority: 64\n IPv4 interface address: 10.0.0.2\n IPv6 interface address: fe80::2:ff:fe02:0\n Area addresses: 49.0001\n\n\n\n\n\nIf IS-IS is not configured OR IS-IS is configured only on point-to-point interfaces, there is no exposure to this issue.\n\n\n\n\n\nswitch#show isis interface detail\nIS-IS Instance: 1 VRF: default\n \n Interface Ethernet1:\n Index: 4 SNPA: P2P\n MTU: 1497 Type: point-to-point\n Supported address families: IPv4, IPv6\n Area proxy boundary is disabled\n BFD IPv4 is disabled\n BFD IPv6 is disabled\n Hello padding is enabled\n Local fast flooding is disabled\n Level 1:\n Metric: 10, Number of adjacencies: 1\n Link-ID: 04\n Authentication mode: None\n TI-LFA protection is disabled for IPv4\n TI-LFA protection is disabled for IPv6\n Adjacency 1111.1111.1002:\n State: UP, Level: 1 Type: Level 1 IS\n Advertised hold time: 30\n Neighbor supported address families: IPv4, IPv6\n Address family match: Enabled\n IPv4 interface address: 1.0.0.2\n IPv6 interface address: fe80::2:ff:fe02:0\n Area addresses: 49.0001\n Peer fast flooding is disabled",
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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>IS-IS must be enabled on a broadcast (LAN) interface AND there should be an active IS-IS adjacency on that interface:</p><pre>switch(config-router-isis)#show active\nrouter isis 1\n net 49.0001.1111.1111.1001.00\nswitch(config-if-Et1)#show active\ninterface Ethernet1\n isis enable 1<br><br><pre>switch#show isis interface detail\nIS-IS Instance: 1 VRF: default\n<br>\n Interface Ethernet1:\n Index: 4 SNPA: 2:2:0:1:0:0\n MTU: 1497 Type: broadcast\n Supported address families: IPv4, IPv6\n Area proxy boundary is disabled\n BFD IPv4 is disabled\n BFD IPv6 is disabled\n Hello padding is enabled\n Level 1:\n Metric: 10, Number of adjacencies: 1\n LAN-ID: 1111.1111.1001.04, Priority: 64\n DIS: 1111.1111.1001, DIS priority: 64\n Authentication mode: None\n TI-LFA protection is disabled for IPv4\n TI-LFA protection is disabled for IPv6\n Adjacency 1111.1111.1002:\n State: UP, Level: 1 Type: Level 1 IS\n Advertised hold time: 9\n Neighbor supported address families: IPv4, IPv6\n Address family match: Enabled\n SNPA: 2:2:0:2:0:0, Priority: 64\n IPv4 interface address: 10.0.0.2\n IPv6 interface address: fe80::2:ff:fe02:0\n Area addresses: 49.0001</pre></pre><p>If IS-IS is not configured OR IS-IS is configured only on point-to-point interfaces, there is no exposure to this issue.<br><br></p><pre>switch#show isis interface detail\nIS-IS Instance: 1 VRF: default\n \n Interface Ethernet1:\n Index: 4 SNPA: P2P\n MTU: 1497 Type: point-to-point\n Supported address families: IPv4, IPv6\n Area proxy boundary is disabled\n BFD IPv4 is disabled\n BFD IPv6 is disabled\n Hello padding is enabled\n Local fast flooding is disabled\n Level 1:\n Metric: 10, Number of adjacencies: 1\n Link-ID: 04\n Authentication mode: None\n TI-LFA protection is disabled for IPv4\n TI-LFA protection is disabled for IPv6\n Adjacency 1111.1111.1002:\n State: UP, Level: 1 Type: Level 1 IS\n Advertised hold time: 30\n Neighbor supported address families: IPv4, IPv6\n Address family match: Enabled\n IPv4 interface address: 1.0.0.2\n IPv6 interface address: fe80::2:ff:fe02:0\n Area addresses: 49.0001\n Peer fast flooding is disabled<br></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": "No workaround is available 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>No workaround is available 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 fixed software version.",
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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 fixed software version.</p>"
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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 and the company is not aware of any malicious uses of these issues in customer networks.",
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"type": "finder"
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}
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],
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"source": {
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"advisory": "0160",
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"discovery": "UNKNOWN",
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"defects": [
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"BUG1840504"
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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": "2026-09-16T19:34:09.117613Z",
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"id": "CVE-2026-73446",
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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": "2026-09-16T19:34:18.384Z"
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}
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}
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]
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}
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} |