CVE-2021-28500 Auth bypass in Arista EOS
Local users with nopassword configuration can gain unrestricted access to Arista EOS devices due to incorrect AAA API usage by OpenConfig and TerminAttr agents.
- 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-2021-28500?
CVE-2021-28500 is a critical authentication bypass vulnerability in Arista EOS, published on 14 Jan 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An issue has recently been discovered in Arista EOS where the incorrect use of EOS's AAA API’s by the OpenConfig and TerminAttr agents could result in unrestricted access to the device for local users with nopassword configuration.
Weakness: CWE-285
Which versions are affected by CVE-2021-28500?
It affects 1 product.
Products include Arista Eos.
How do I fix CVE-2021-28500?
No fix has been published for CVE-2021-28500 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-2021-28500 being exploited?
There is no known exploitation of CVE-2021-28500 in the wild and no public exploit code.
Other vulnerabilities in Arista EOS
Sources
Also known as GHSA-5g2c-wqm3-5vm3.