CVE-2026-73444 Auth bypass in EOS
An attacker on the local network can bypass VRRP authentication to become the master router, allowing them to intercept or modify traffic.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-73444?
CVE-2026-73444 is a medium-severity authentication bypass vulnerability in Arista Networks EOS, published on 15 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
On affected platforms running Arista EOS with VRRPv2 IP Authentication Header (IP-AH) authentication configured, an unauthenticated attacker with access to the layer 2 network segment on which VRRP is running could bypass VRRP authentication and claim the virtual router master role, enabling the attacker to intercept, modify, or discard traffic that hosts on the segment send to the virtual gateway address.
Weakness: CWE-303
Which versions are affected by CVE-2026-73444?
How do I fix CVE-2026-73444?
No fix has been published for CVE-2026-73444 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-73444 being exploited?
There is no known exploitation of CVE-2026-73444 in the wild and no public exploit code.
Sources
Also known as GHSA-c355-4cc9-9547.