CVE-2021-28495 Auth bypass in Metamako Operating System

High 7.2 Published 9 Sep 2021 Updated 3 Aug 2024

Attackers can bypass user authentication on Arista Metamako devices when JSON-RPC API access is enabled, potentially gaining unauthorized access.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2021-28495?

CVE-2021-28495 is a high-severity authentication bypass vulnerability in Arista Metamako Operating System, published on 9 Sep 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

In Arista's MOS (Metamako Operating System) software which is supported on the 7130 product line, under certain conditions, user authentication can be bypassed when API access is enabled via the JSON-RPC APIs. This issue affects: Arista Metamako Operating System All releases in the MOS-0.1x train MOS-0.13 and post releases in the MOS-0.1x train MOS-0.26.6 and below releases in the MOS-0.2x train MOS-0.31.1 and below releases in the MOS-0.3x train

Weakness: CWE-287

Which versions are affected by CVE-2021-28495?

It affects 1 product.

Products include Arista Metamako Operating System.

How do I fix CVE-2021-28495?

No fix has been published for CVE-2021-28495 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-2021-28495 being exploited?

There is no known exploitation of CVE-2021-28495 in the wild and no public exploit code.

Sources

Also known as GHSA-cpvp-q5mv-cx2q.