CVE-2026-73435

8.2 HIGH

Published 2026-09-16 · Updated 2026-09-16

AI risk analysis

Summary: This flaw allows an attacker to cause adjacency flapping and packet loss in OSPFv2-configured networks, disrupting routing within the OSPF domain.
Exploitability: Exploitation requires an attacker to be on the same broadcast segment and have OSPFv2 authentication configured, making it moderately difficult.
Blast radius: If exploited, the disruption can affect routing across the broader OSPF domain, impacting network performance and reliability.
Detection: No reliable host or network indicator is derivable from the published description.
Prioritized remediation: Disable OSPFv2 authentication or ensure all devices on the same broadcast segment are patched to the latest version.

networkroutingospfv2

Analysis generated locally by qwen2.5:7b-instruct (no data left the box). AI-assisted — verify against primary sources before acting.

NVD 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.

CVSS vector

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

Weaknesses

CWE-345

References

https://www.arista.com/en/support/advisories-notices/security-advisory/24727-security-advisory-0171

Data: NVD (public domain). Analysis: local $0 model. Defensive use only.