What is CVE-2026-73435?

CVE-2026-73435 is a high-severity vulnerability in Arista Networks Eos, classified under Insufficient Verification of Data Authenticity. CVSS score: 8.2/10. Published 2026-09-16.

How severe is CVE-2026-73435?

High severity. CVSS v3 base score is 8.2 out of 10.

Vulnerability in Arista Networks Eos

CVE-2026-73435

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 v3 metric

CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:H.

Affected products

Arista Networks Eos

Weakness classification (CWE)

CWE-345 — Insufficient Verification of Data Authenticity

References

psirt@arista.com (vendor-advisory)

Frequently asked questions

What is CVE-2026-73435?: CVE-2026-73435 is a high-severity vulnerability in Arista Networks Eos, classified under Insufficient Verification of Data Authenticity. CVSS score: 8.2/10. Published 2026-09-16.
How severe is CVE-2026-73435?: High severity. CVSS v3 base score is 8.2 out of 10.