Improper Authorization in Arista Extensible Operating System (EOS) - CVE-2021-28503
Published: May 17, 2025
Vulnerability identifier: #VU109303
CSH Severity: High
CVSS v4: 9.2 [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]
CVE-ID: CVE-2021-28503
CWE-ID: CWE-285
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
Arista Extensible Operating System (EOS)
How to mitigate CVE-2021-28503
Install updates from vendor's website.
Arista Extensible Operating System (EOS) - addressed in versions 4.23.10, 4.24.8, 4.25.6, 4.26.3