Improper Authorization in Arista Extensible Operating System (EOS) - CVE-2021-28503
Published: May 17, 2025
Vulnerability identifier: #VU109303
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2021-28503
CWE-ID: CWE-285
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Arista Networks
Affected software:
Arista Extensible Operating System (EOS)
Arista Extensible Operating System (EOS)
Detailed vulnerability description
The vulnerability allows a remote attacker to bypass authorization.
The vulnerability exists due to an error in the eAPI implementation that may skip re-evaluating user credentials when certificate based authentication is used. A remote attacker can bypass authorization checks and gain access to the system.
How to mitigate CVE-2021-28503
Install updates from vendor's website.