CVE-2024-6858 Auth bypass in EOS
Unauthenticated hosts may gain switch port access in Arista EOS 802.1X multi-auth mode if an EAPOL device exists in the fallback VLAN.
- 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-2024-6858?
CVE-2024-6858 is a medium-severity authentication bypass vulnerability in Arista Networks EOS, published on 4 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In Arista’s EOS when in 802.1X mode, multi-auth unauthenticated hosts might be allowed access to a switch port if there exists an EAPOL capable device in the fallback VLAN.
Weakness: CWE-1287
Which versions are affected by CVE-2024-6858?
How do I fix CVE-2024-6858?
No fix has been published for CVE-2024-6858 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-2024-6858 being exploited?
There is no known exploitation of CVE-2024-6858 in the wild and no public exploit code.
Sources
Also known as GHSA-gmrx-x399-mfhc.