{"api_version":"1","generated_at":"2026-10-27T11:33:59+00:00","cve":"CVE-2026-73455","urls":{"html":"https://cve.report/CVE-2026-73455","api":"https://cve.report/api/cve/CVE-2026-73455.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-73455","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-73455"},"summary":{"title":"Security Advisory 0173","description":"On affected platforms running Arista EOS with Open Shortest Path First version 3 (OSPFv3) configured, a specially crafted packet can cause the OSPFv3 agent to restart unexpectedly.","state":"PUBLISHED","assigner":"Arista","published_at":"2026-09-16 10:16:52","updated_at":"2026-09-16 19:09:28"},"problem_types":["CWE-130","CWE-130 CWE-130 Improper Handling of Length Parameter 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train\n- 4.35.5M and later in the 4.35.x train\n- 4.36.1F and later in the 4.36.x train\n\nA hotfix (version 1.0) is available for 4.36.0.1F, 4.35.4M, 4.34.6M, and 4.33.8M.","time":"","lang":"en"}],"workarounds":[{"source":"CNA","title":"","value":"Configure OSPFv3 IPsec encryption to authenticate/encrypt OSPFv3 packets.\n\nPer-interface encryption:\n\nswitch(config)# interface <interface-name>\nswitch(config-if)# ospfv3 encryption ipsec spi <spi-value> esp aes-256-cbc sha1 passphrase <shared-passphrase>\n\nPer-area encryption:\n\nswitch(config)# router ospfv3\nswitch(config-router-ospfv3)# address-family ipv4\nswitch(config-router-ospfv3-af)# area <area-id> encryption ipsec spi <spi-value> esp aes-256-cbc sha1 passphrase <shared-passphrase>","time":"","lang":"en"}],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"73455","cve":"CVE-2026-73455","epss":"0.004760000","percentile":"0.399980000","score_date":"2026-09-16","updated_at":"2026-09-17 00:07:16"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"adp":[{"metrics":[{"other":{"content":{"id":"CVE-2026-73455","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","timestamp":"2026-09-16T17:56:02.507882Z","version":"2.0.3"},"type":"ssvc"}}],"providerMetadata":{"dateUpdated":"2026-09-16T17:56:12.396Z","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP"},"title":"CISA ADP Vulnrichment"}],"cna":{"affected":[{"defaultStatus":"unaffected","product":"EOS","vendor":"Arista Networks","versions":[{"lessThan":"4.33.0F","status":"affected","version":"1.0.0","versionType":"custom"},{"lessThanOrEqual":"4.33.8M","status":"affected","version":"4.33.0F","versionType":"custom"},{"lessThanOrEqual":"4.34.6M","status":"affected","version":"4.34.0F","versionType":"custom"},{"lessThanOrEqual":"4.35.4M","status":"affected","version":"4.35.0F","versionType":"custom"},{"lessThanOrEqual":"4.36.0.1F","status":"affected","version":"4.36.0F","versionType":"custom"}]}],"configurations":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"<p>The vulnerability is exploitable when OSPFv3 is configured with at least one active neighbor:</p>\n<pre>\nswitch&gt;show ospfv3\nRouting Process &quot;ospfv3&quot; with ID 192.0.2.0 and Instance 0 VRF default\nIt has 1 fully adjacent neighbors\n\nswitch&gt;show ospfv3 neighbor\nNeighbor 192.0.3.0 VRF default priority is 1, state is Full\n</pre>"}],"value":"The vulnerability is exploitable when OSPFv3 is configured with at least one active neighbor:\n\nswitch>show ospfv3\nRouting Process \"ospfv3\" with ID 192.0.2.0 and Instance 0 VRF default\nIt has 1 fully adjacent neighbors\n\nswitch>show ospfv3 neighbor\nNeighbor 192.0.3.0 VRF default priority is 1, state is Full"}],"datePublic":"2026-09-09T00:00:00.000Z","descriptions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"<p>On affected platforms running Arista EOS with Open Shortest Path First version 3 (OSPFv3) configured, a specially crafted packet can cause the OSPFv3 agent to restart unexpectedly.</p>"}],"value":"On affected platforms running Arista EOS with Open Shortest Path First version 3 (OSPFv3) configured, a specially crafted packet can cause the OSPFv3 agent to restart unexpectedly."}],"impacts":[{"capecId":"CAPEC-231","descriptions":[{"lang":"en","value":"CAPEC-231 Oversized Serialized Data Payloads"}]}],"metrics":[{"cvssV3_1":{"baseScore":7.5,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]},{"cvssV4_0":{"baseScore":8.9,"baseSeverity":"HIGH","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H","version":"4.0"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-130","description":"CWE-130 Improper Handling of Length Parameter Inconsistency","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-09-16T09:46:15.888Z","orgId":"c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7","shortName":"Arista"},"references":[{"tags":["vendor-advisory"],"url":"https://www.arista.com/en/support/advisories-notices/security-advisory/24729-security-advisory-0173"}],"solutions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"<p>The following EOS releases contain the fix:</p>\n<ul>\n<li>4.33.9M and later in the 4.33.x train</li>\n<li>4.34.7M and later in the 4.34.x train</li>\n<li>4.35.5M and later in the 4.35.x train</li>\n<li>4.36.1F and later in the 4.36.x train</li>\n</ul>\n<p>A hotfix (version 1.0) is available for 4.36.0.1F, 4.35.4M, 4.34.6M, and 4.33.8M.</p>"}],"value":"The following EOS releases contain the fix:\n- 4.33.9M and later in the 4.33.x train\n- 4.34.7M and later in the 4.34.x train\n- 4.35.5M and later in the 4.35.x train\n- 4.36.1F and later in the 4.36.x train\n\nA hotfix (version 1.0) is available for 4.36.0.1F, 4.35.4M, 4.34.6M, and 4.33.8M."}],"source":{"advisory":"Security Advisory 0173","defects":["BUG1307559"],"discovery":"INTERNAL"},"title":"Security Advisory 0173","workarounds":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"<p>Configure OSPFv3 IPsec encryption to authenticate/encrypt OSPFv3 packets.</p>\n<p>Per-interface encryption:</p>\n<pre>\nswitch(config)# interface &lt;interface-name&gt;\nswitch(config-if)# ospfv3 encryption ipsec spi &lt;spi-value&gt; esp aes-256-cbc sha1 passphrase &lt;shared-passphrase&gt;\n</pre>\n<p>Per-area encryption:</p>\n<pre>\nswitch(config)# router ospfv3\nswitch(config-router-ospfv3)# address-family ipv4\nswitch(config-router-ospfv3-af)# area &lt;area-id&gt; encryption ipsec spi &lt;spi-value&gt; esp aes-256-cbc sha1 passphrase &lt;shared-passphrase&gt;\n</pre>"}],"value":"Configure OSPFv3 IPsec encryption to authenticate/encrypt OSPFv3 packets.\n\nPer-interface encryption:\n\nswitch(config)# interface <interface-name>\nswitch(config-if)# ospfv3 encryption ipsec spi <spi-value> esp aes-256-cbc sha1 passphrase <shared-passphrase>\n\nPer-area encryption:\n\nswitch(config)# router ospfv3\nswitch(config-router-ospfv3)# address-family ipv4\nswitch(config-router-ospfv3-af)# area <area-id> encryption ipsec spi <spi-value> esp aes-256-cbc sha1 passphrase <shared-passphrase>"}]}},"cveMetadata":{"assignerOrgId":"c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7","assignerShortName":"Arista","cveId":"CVE-2026-73455","datePublished":"2026-09-16T09:46:15.888Z","dateReserved":"2026-08-12T16:45:03.510Z","dateUpdated":"2026-09-16T17:56:12.396Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-16 10:16:52","lastModifiedDate":"2026-09-16 19:09:28","problem_types":["CWE-130","CWE-130 CWE-130 Improper Handling of Length Parameter 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