Improper input validation in Arista Extensible Operating System (EOS) and Arista CloudEOS VM - CVE-2025-5089
Published: April 15, 2026
Vulnerability identifier: #VU126168
CSH Severity: Medium
CVSS v4: 6 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2025-5089
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to improper input validation in the Sysdb agent when processing malformed messages from a connected CVX server or connected EOS switch. A remote user can send specially crafted TCP packets to cause a denial of service.
Only systems with CVX enabled are vulnerable, and EOS switches not connected to a CVX server are not impacted.
Affected software
Arista Extensible Operating System (EOS)
Arista CloudEOS VM
Arista CloudEOS VM
How to mitigate CVE-2025-5089
Install security update from vendor's website.
Arista Extensible Operating System (EOS) - addressed in versions 4.31.9M, 4.32.7M, 4.33.5M, 4.34.2F
Arista CloudEOS VM - addressed in versions 4.31.9M, 4.32.7M, 4.33.5M, 4.34.2F
Arista CloudEOS VM - addressed in versions 4.31.9M, 4.32.7M, 4.33.5M, 4.34.2F