CVE-2026-73435

Security Advisory 0171

State: Published
Severity: 7.0 High
Published: Sep 16, 2026
Updated: Sep 16, 2026
Reserved: Aug 12, 2026

Description

On affected platforms running Arista EOS with Open Shortest Path First version 2 (OSPFv2) configured, a specially crafted OSPFv2 packet from an unauthenticated attacker on the same broadcast segment, with OSPFv2 authentication configured can cause adjacency flapping and packet loss. The disruption can affect routing across the broader OSPF domain.

Scores

CVSS	Score	Vector	Source
4.0	7.0 High	CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H	Arista
3.1	8.2 High	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:H	Arista

Weaknesses

CWE-345 Insufficient Verification of Data Authenticity

Affected Products

Product	Versions
EOSArista Networks	4.36.0F through 4.36.1FAffected 4.35.0F through 4.35.5MAffected 4.34.0F through 4.34.7MAffected 4.33.0F through 4.33.9MAffected 1.0.0 to before 4.33.0FAffected

References

Security Advisory 0171vendor-advisory

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