CVE-2026-121368

HighCVSS 8.6/10Last modified Nov 12, 2026

Description

On affected platforms running Arista EOS with Bidirectional Forwarding Detection (BFD) configured to use keyed MD5 or keyed SHA1 authentication, an unauthenticated attacker with network adjacency (direct or multi-hop) to a BFD-enabled interface can send a specially crafted BFD packet resulting in a system reboot.

Metrics

CVSS 3.1 8.6/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Weakness enumeration

CWE-787

Affected software

Source: the vendor's advisory (CNA). NVD analysis pending.

Vendor	Product	Versions
Arista Networks	EOS	>= 4.36.0F, <= 4.36.2F; >= 4.35.0F, <= 4.35.6M; >= 4.34.0F, <= 4.34.8M; >= 4.33.0F, <= 4.33.10M; >= 4.32.0F, < 4.33.0F; >= 1.0.0, < 4.32.0F

References

https://www.arista.com/en/support/advisories-notices/security-advisory/25028-security-advisory-0206

Timeline

Published: Nov 10, 2026
Last modified: Nov 12, 2026
NVD status: Awaiting Analysis

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