CVE-2026-73438

Security Advisory 0172

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 3 (OSPFv3) configured, an unauthenticated attacker on the same OSPFv3 broadcast domain can send a specially crafted set of packets that can cause the Ospf3 agent to restart unexpectedly. The crash results in the loss of all OSPFv3 adjacencies on the affected device and may disrupt routing across the broader OSPF domain until the agent recovers.

This issue was reported externally by Dravanet Inc., and Arista is not aware of any malicious exploitation of this vulnerability in customer networks.

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	5.3 Medium	CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H	Arista

Weaknesses

CWE-617 Reachable Assertion

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 0172vendor-advisory

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