CVE-2026-73435 (GCVE-0-2026-73435)
Vulnerability from cvelistv5
Published
2026-09-16 09:19
Modified
2026-09-16 15:29
Severity ?
8.2 (High) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:H
7.0 (High) - 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
CWE
  • CWE-345 - Insufficient Verification of Data Authenticity
Summary
On affected platforms running Arista EOS with Open Shortest Path First version 2 (OSPFv2) configured, a specially crafted OSPFv2 packet from an unauthenticated attacker on the same broadcast segment, with OSPFv2 authentication configured can cause adjacency flapping and packet loss. The disruption can affect routing across the broader OSPF domain.
References
Impacted products
Vendor Product Version
Arista Networks EOS Version: 4.36.0F   <
Version: 4.35.0F   <
Version: 4.34.0F   <
Version: 4.33.0F   <
Version: 1.0.0   < 4.33.0F
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              "value": "\u003cp\u003eIn order to be vulnerable to CVE-2026-73435, all of the following conditions must be met:\u003c/p\u003e\u003col\u003e\u003cli\u003eThe vulnerable OSPFv2 instance must have at least two neighbors on the same interface.\u003c/li\u003e\u003cli\u003eThe interface is a broadcast interface.\u003c/li\u003e\u003cli\u003eOSPFv2 cryptographic authentication is configured.\u003c/li\u003e\u003c/ol\u003e\u003cp\u003eHere is an example showing a vulnerable OSPFv2 instance with a minimum of two neighbors on the same interface:\u003c/p\u003e\u003cpre\u003eswitch\u003eshow ip ospf neighbor\nNeighbor ID Instance VRF ... Interface\nX.X.X.X     X       ...  ... \u0026lt;intf\u0026gt;\nX.X.X.X     X       ...  ... \u0026lt;intf\u0026gt;\u003c/pre\u003e\u003cp\u003eHere is an example showing the vulnerable configuration of Network Type \u0026quot;Broadcast\u0026quot; and Message-digest authentication (cryptographic authentication) configured:\u003c/p\u003e\u003cpre\u003eswitch\u003eshow ip ospf interface\n\u0026lt;intf\u0026gt; is up\n  Interface Address X.X.X.X/X, instance X, VRF X, Area X.X.X.X\n  Network Type Broadcast, Cost: X\n  ...\n  Message-digest authentication, using key id X\n  ...\u003c/pre\u003e\u003cp\u003eNote: Both \u0026quot;Message-digest authentication\u0026quot; (MD5) and \u0026quot;Message-digest sha\u0026lt;X\u0026gt; authentication\u0026quot; (SHA) are vulnerable.\u003c/p\u003e\u003cp\u003eTo check area-level authentication, reference the vulnerable interface area ID in \u0026quot;show ip ospf\u0026quot; output:\u003c/p\u003e\u003cpre\u003eswitch\u003eshow ip ospf\nOSPF instance X with ID X.X.X.X VRF X\n...\nArea X.X.X.X\n Number of interface in this area is X\n   It is a X area\n   Traffic engineering is disabled\n   Area has MD5 authentication\u003c/pre\u003e\u003cp\u003eIf the area has \u0026quot;Simple\u0026quot; or \u0026quot;None\u0026quot; authentication, then at the area-level, the third prerequisite is unmet and the system would not be vulnerable to this particular issue.\u003c/p\u003e"
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              "value": "\u003cp\u003eOn affected platforms running Arista EOS with Open Shortest Path First version 2 (OSPFv2) configured, a specially crafted OSPFv2 packet from an unauthenticated attacker on the same broadcast segment, with OSPFv2 authentication configured can cause adjacency flapping and packet loss. The disruption can affect routing across the broader OSPF domain.\u003c/p\u003e\u003cp\u003eThese issues were discovered internally by Arista, and the company is not aware of any malicious uses of these issues in customer networks.\u003c/p\u003e"
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              "value": "\u003cp\u003eThe 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.\u003c/p\u003e\u003cp\u003eCVE-2026-73435 has been fixed in the following releases:\u003c/p\u003e\u003cul\u003e\u003cli\u003e4.36.2F and later releases in the 4.36.x train\u003c/li\u003e\u003cli\u003e4.35.6M and later releases in the 4.35.x train\u003c/li\u003e\u003cli\u003e4.34.7.1M and later releases in the 4.34.x train\u003c/li\u003e\u003cli\u003e4.33.10M and later releases in the 4.33.x train\u003c/li\u003e\u003c/ul\u003e\u003cp\u003eA hotfix is available for the following releases: 4.36.1F, 4.35.5M, 4.34.7M, 4.33.9M.\u003cbr\u003eURL: https://www.arista.com/support/advisories-notices/sa-download/?sa171-SecurityAdvisory171_CVE-2026-73435.swix\u003cbr\u003eSWIX hash (SHA512): 4c4ff053d8165f347b45dfcafc2d20396e3eb00869b0088f3128be7f53b2a028b479fa8279849c800b5916ab9aaf8077718a68e3bf4277d55b44076650de0aa7\u003cbr\u003eNote: Installing/uninstalling the SWIX will cause the Ospf process to restart.\u003c/p\u003e"
            }
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Arista recommends customers move to the latest version of each release that contains all the fixes listed below.\\n\\nCVE-2026-73435 has been fixed in the following releases:\\n- 4.36.2F and later releases in the 4.36.x train\\n- 4.35.6M and later releases in the 4.35.x train\\n- 4.34.7.1M and later releases in the 4.34.x train\\n- 4.33.10M and later releases in the 4.33.x train\\n\\nA hotfix is available for the following releases: 4.36.1F, 4.35.5M, 4.34.7M, 4.33.9M.\\nURL: https://www.arista.com/support/advisories-notices/sa-download/?sa171-SecurityAdvisory171_CVE-2026-73435.swix\\nSWIX hash (SHA512): 4c4ff053d8165f347b45dfcafc2d20396e3eb00869b0088f3128be7f53b2a028b479fa8279849c800b5916ab9aaf8077718a68e3bf4277d55b44076650de0aa7\\nNote: Installing/uninstalling the SWIX will cause the Ospf process to restart.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eThe 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.\u003c/p\u003e\u003cp\u003eCVE-2026-73435 has been fixed in the following releases:\u003c/p\u003e\u003cul\u003e\u003cli\u003e4.36.2F and later releases in the 4.36.x train\u003c/li\u003e\u003cli\u003e4.35.6M and later releases in the 4.35.x train\u003c/li\u003e\u003cli\u003e4.34.7.1M and later releases in the 4.34.x train\u003c/li\u003e\u003cli\u003e4.33.10M and later releases in the 4.33.x train\u003c/li\u003e\u003c/ul\u003e\u003cp\u003eA hotfix is available for the following releases: 4.36.1F, 4.35.5M, 4.34.7M, 4.33.9M.\u003cbr\u003eURL: https://www.arista.com/support/advisories-notices/sa-download/?sa171-SecurityAdvisory171_CVE-2026-73435.swix\u003cbr\u003eSWIX hash (SHA512): 4c4ff053d8165f347b45dfcafc2d20396e3eb00869b0088f3128be7f53b2a028b479fa8279849c800b5916ab9aaf8077718a68e3bf4277d55b44076650de0aa7\u003cbr\u003eNote: Installing/uninstalling the SWIX will cause the Ospf process to restart.\u003c/p\u003e\", \"base64\": false}]}], \"references\": [{\"url\": \"https://www.arista.com/en/support/advisories-notices/security-advisory/24727-security-advisory-0171\", \"name\": \"Security Advisory 0171\", \"tags\": [\"vendor-advisory\"]}], \"workarounds\": [{\"lang\": \"en\", \"value\": \"No mitigation is available for CVE-2026-73435.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eNo mitigation is available for CVE-2026-73435.\u003c/p\u003e\", \"base64\": false}]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"On affected platforms running Arista EOS with Open Shortest Path First version 2 (OSPFv2) configured, a specially crafted OSPFv2 packet from an unauthenticated attacker on the same broadcast segment, with OSPFv2 authentication configured can cause adjacency flapping and packet loss. The disruption can affect routing across the broader OSPF domain.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eOn affected platforms running Arista EOS with Open Shortest Path First version 2 (OSPFv2) configured, a specially crafted OSPFv2 packet from an unauthenticated attacker on the same broadcast segment, with OSPFv2 authentication configured can cause adjacency flapping and packet loss. The disruption can affect routing across the broader OSPF domain.\u003c/p\u003e\u003cp\u003eThese issues were discovered internally by Arista, and the company is not aware of any malicious uses of these issues in customer networks.\u003c/p\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-345\", \"description\": \"CWE-345 Insufficient Verification of Data Authenticity\"}]}], \"configurations\": [{\"lang\": \"en\", \"value\": \"In order to be vulnerable to CVE-2026-73435, all of the following conditions must be met:\\n\\n1. The vulnerable OSPFv2 instance must have at least two neighbors on the same interface.\\n2. The interface is a broadcast interface.\\n3. OSPFv2 cryptographic authentication is configured.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eIn order to be vulnerable to CVE-2026-73435, all of the following conditions must be met:\u003c/p\u003e\u003col\u003e\u003cli\u003eThe vulnerable OSPFv2 instance must have at least two neighbors on the same interface.\u003c/li\u003e\u003cli\u003eThe interface is a broadcast interface.\u003c/li\u003e\u003cli\u003eOSPFv2 cryptographic authentication is configured.\u003c/li\u003e\u003c/ol\u003e\u003cp\u003eHere is an example showing a vulnerable OSPFv2 instance with a minimum of two neighbors on the same interface:\u003c/p\u003e\u003cpre\u003eswitch\u003eshow ip ospf neighbor\\nNeighbor ID Instance VRF ... Interface\\nX.X.X.X     X       ...  ... \u0026lt;intf\u0026gt;\\nX.X.X.X     X       ...  ... \u0026lt;intf\u0026gt;\u003c/pre\u003e\u003cp\u003eHere is an example showing the vulnerable configuration of Network Type \u0026quot;Broadcast\u0026quot; and Message-digest authentication (cryptographic authentication) configured:\u003c/p\u003e\u003cpre\u003eswitch\u003eshow ip ospf interface\\n\u0026lt;intf\u0026gt; is up\\n  Interface Address X.X.X.X/X, instance X, VRF X, Area X.X.X.X\\n  Network Type Broadcast, Cost: X\\n  ...\\n  Message-digest authentication, using key id X\\n  ...\u003c/pre\u003e\u003cp\u003eNote: Both \u0026quot;Message-digest authentication\u0026quot; (MD5) and \u0026quot;Message-digest sha\u0026lt;X\u0026gt; authentication\u0026quot; (SHA) are vulnerable.\u003c/p\u003e\u003cp\u003eTo check area-level authentication, reference the vulnerable interface area ID in \u0026quot;show ip ospf\u0026quot; output:\u003c/p\u003e\u003cpre\u003eswitch\u003eshow ip ospf\\nOSPF instance X with ID X.X.X.X VRF X\\n...\\nArea X.X.X.X\\n Number of interface in this area is X\\n   It is a X area\\n   Traffic engineering is disabled\\n   Area has MD5 authentication\u003c/pre\u003e\u003cp\u003eIf the area has \u0026quot;Simple\u0026quot; or \u0026quot;None\u0026quot; authentication, then at the area-level, the third prerequisite is unmet and the system would not be vulnerable to this particular issue.\u003c/p\u003e\", \"base64\": false}]}], \"providerMetadata\": {\"orgId\": \"c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7\", \"shortName\": \"Arista\", \"dateUpdated\": \"2026-09-16T10:13:38.708Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-73435\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-09-16T15:29:43.316Z\", \"dateReserved\": \"2026-08-12T16:39:35.976Z\", \"assignerOrgId\": \"c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7\", \"datePublished\": \"2026-09-16T09:19:47.285Z\", \"assignerShortName\": \"Arista\"}",
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}


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