{"id":"CVE-2026-121291","aliases":[],"cve":{"records":[{"id":"CVE-2026-121291","source":"Arista","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-11-03T11:21:01.892Z","published":"2026-11-10T20:09:57.730Z","modified":"2026-11-13T17:27:40.172Z"}],"publishers":[{"name":"Arista","role":"CNA","organizationId":"c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7","modified":"2026-11-10T20:09:57.730Z"},{"name":"CISA-ADP","role":"ADP","organizationId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","modified":"2026-11-13T17:27:40.172Z"}],"references":[{"url":"https://www.arista.com/en/support/advisories-notices/security-advisory/25044-security-advisory-0222","tags":["vendor-advisory"],"source":"Arista"}],"weaknesses":[{"id":"CWE-696","description":"CWE-696 Incorrect Behavior Order","source":"Arista"}],"applicability":[],"prioritization":[{"source":"CISA-ADP","type":"SSVC","role":"CISA Coordinator","timestamp":"2026-11-13T17:27:27.385133Z","decisions":[{"name":"Exploitation","value":"none"},{"name":"Automatable","value":"yes"},{"name":"Technical Impact","value":"partial"}]}]},"title":"Security Advisory 0222","titleSource":"Arista","descriptionSource":"Arista","description":"A crafted Error Report can leave EOS stuck believing that a cache reset is in progress, preventing ROA publication, withdrawal reconciliation, and BGP origin-validation updates.","score":8.3,"severity":"high","published":"2026-11-10T20:09:57.730Z","modified":"2026-11-13T17:27:40.172Z","withdrawn":false,"knownExploited":false,"affected":[],"products":[{"vendor":"Arista Networks","name":"EOS","platforms":["710 Series","720D Series","720XP/722XPM Series","750X Series","7010TX Series","7020R/R4 Series","7130 Series running EOS","7170 Series","7050X3/X4 Series","7060X/X2/X4/X5/X6/XE7 Series","7260X/X3 Series","7280R/R2/R3/R4 Series","7300X/X3 Series","7320X Series","7358X4 Series","7368X4 Series","7388X5 Series","7500R/R2/R3 Series","7800R3/R4 Series","7700R4 Series","AWE 5000 Series","AWE 7200R Series","ZTX-7200 Series","CloudEOS","cEOS-lab","vEOS-lab","CloudVision eXchange, virtual or physical appliance"],"versions":[{"version":"4.37.0F","status":"affected","versionType":"custom"},{"version":"4.36.0F","status":"affected","lessThanOrEqual":"4.36.2F","versionType":"custom"},{"version":"4.35.0F","status":"affected","lessThanOrEqual":"4.35.6M","versionType":"custom"}],"defaultStatus":"unaffected","cpes":[],"source":"Arista","url":"https://www.cve.org/CVERecord?id=CVE-2026-121291"}],"remediation":[],"references":["https://www.arista.com/en/support/advisories-notices/security-advisory/25044-security-advisory-0222"],"sources":[{"name":"CVE","id":"CVE-2026-121291","modified":"2026-11-13T17:27:40.172Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-121291"}],"assessments":[{"source":"Arista","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L","score":8.2},{"source":"Arista","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:L/SC:N/SI:L/SA:N","score":8.3}],"sourceAffected":[],"observedAt":"2026-11-14T02:37:58.169Z","kev":{"status":"not-listed","checkedAt":"2026-11-15T02:25:31.038Z"},"coverage":[{"source":"NVD","status":"available","checkedAt":"2026-11-14T03:00:33.784Z","attemptedAt":"2026-11-14T03:00:33.784Z"},{"source":"GHSA","status":"available","checkedAt":"2026-11-14T03:00:33.784Z","attemptedAt":"2026-11-14T03:00:33.784Z"},{"source":"EUVD","status":"available","checkedAt":"2026-11-14T03:00:33.784Z","attemptedAt":"2026-11-14T03:00:33.784Z"},{"source":"EPSS","status":"available","checkedAt":"2026-11-14T03:00:32.832Z","attemptedAt":"2026-11-14T03:00:32.832Z"}],"evidence":[{"source":"FIRST EPSS","id":"CVE-2026-121291","url":"https://www.first.org/epss/","probability":0.00413,"percentile":0.36126,"date":"2026-11-13","checkedAt":"2026-11-14T03:00:32.832Z"},{"source":"ENISA EUVD","id":"EUVD-2026-122812","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-122812","modified":"Nov 13, 2026, 5:27:40 PM","score":8.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:L/SC:N/SI:L/SA:N","checkedAt":"2026-11-14T03:00:33.784Z"},{"source":"NVD","id":"CVE-2026-121291","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121291","modified":"2026-11-13T18:17:29.817","score":8.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:L/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","checkedAt":"2026-11-14T03:00:33.784Z"},{"source":"NVD","id":"CVE-2026-121291","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121291","modified":"2026-11-13T18:17:29.817","score":8.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L","checkedAt":"2026-11-14T03:00:33.784Z"},{"source":"GitHub Advisory Database","id":"GHSA-r4g2-mmcv-4w88","url":"https://github.com/advisories/GHSA-r4g2-mmcv-4w88","modified":"2026-11-10T21:34:29Z","score":8.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L","checkedAt":"2026-11-14T03:00:33.784Z"}],"aiSummary":{"text":"A crafted Error Report can cause Arista EOS versions 4.35.0F to 4.35.6M, 4.36.0F to 4.36.2F, and 4.37.0F to malfunction, preventing certain updates. The weakness is due to incorrect behavior order. Local access may be required to exploit this vulnerability.","model":"@cf/meta/llama-3.3-70b-instruct-fp8-fast","generatedAt":"2026-11-12T10:46:15.657Z","sources":[{"name":"CVE","url":"https://www.cve.org/CVERecord?id=CVE-2026-121291"}]}}