CVE-2026-121289

{
  "etk_id": "ETK-2026-4096",
  "cve_id": "CVE-2026-121289",
  "display_id": "CVE-2026-121289",
  "ghsa_id": "GHSA-rrpp-332g-xvjw",
  "euvd_id": "EUVD-2026-122810",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Stack buffer overflow in Arista EOS BGP agent",
  "summary": "Arista EOS devices with BGP configured are affected by a stack buffer overflow in the BGP agent. A remote attacker may terminate the agent, dropping BGP sessions and disrupting routing; code execution may also be possible.",
  "mitigation": "Upgrade EOS to version 4.33.0F. Until upgrades are complete, limit BGP connectivity to trusted peers where operationally feasible.",
  "vendor": "Arista Networks",
  "product": "EOS",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 4.36.0F, <= 4.36.2F",
        ">= 4.35.0F, <= 4.35.6M",
        ">= 4.34.0F, <= 4.34.8M",
        ">= 4.33.0F, <= 4.33.10M",
        ">= 4.25.1F, < 4.33.0F"
      ],
      "ecosystem": null,
      "fixed_versions": [
        "4.33.0F"
      ],
      "package_name": "EOS",
      "purl": null
    }
  ],
  "cwes": [
    121
  ],
  "cvss_score": 9.3,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "contextual",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 82.26051225,
  "t0_at": "2026-11-10T20:09:56.814000+00:00",
  "signals": {
    "trigger_signal": {
      "at": "2026-11-10T20:09:56.814000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-11-10T20:09:56.814000+00:00",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-121289"
    }
  }
}