# CVE-2026-120981: Security Advisory 0214

Status: published. Published: 2026-11-10. Updated: 2026-11-13.

On affected platforms running Arista EOS with VPLS-BGP enabled, an attacker who has established a BGP session with the PE router can affect the route advertisements of VPLS pseudowires, causing a churn of the established routes with other legitimate BGP peers.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Arista Networks / EOS: ≥ 4.33.0F; ≤ 4.33.10M (affected, custom); ≥ 4.34.0F; ≤ 4.34.8M (affected, custom); ≥ 4.35.0F; ≤ 4.35.6M (affected, custom); ≥ 4.36.0F; ≤ 4.36.2F (affected, custom). Source: CNA: Arista; platforms: 7280R3 Series, 7500R3 Series, 7800R3 Series

## Severity and prioritization

- CVSS 3.1: 5.3 (medium); CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H; source: CNA: Arista

- CVSS 4.0: 6 (medium); CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:L/SA:L; source: CNA: Arista

- CVSS 4.0: 6 (medium); CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:L/SA:L/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; source: NVD: psirt@arista.com

- CVSS 3.1: 5.3 (medium); CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H; source: NVD: psirt@arista.com

- CISA KEV: No listing in collected sources

- EPSS: 0.27% as of 2026-11-13; percentile 18.70%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-772

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://www.arista.com/en/support/advisories-notices/security-advisory/25036-security-advisory-0214 (CNA: Arista; vendor-advisory)

- https://www.arista.com/en/support/advisories-notices/security-advisory/25036-security-advisory-0214 (psirt@arista.com)

## Provenance

- CNA: Arista: https://www.cve.org/CVERecord?id=CVE-2026-120981; retrieved 2026-11-13; source updated 2026-11-13

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-120981; retrieved 2026-11-13; source updated 2026-11-12

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-120981; retrieved 2026-11-13; source updated Not reported

Revision: da09bc30673c5e51baeb29a19e5cca9a1ea8d7173276680e98f5875f46838fea

Canonical: https://y2.dev/cve/CVE-2026-120981

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