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 v4.0: 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/E:U/U:Green
CVE-ID: CVE-2025-5089
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Arista Networks
Affected software:
Arista Extensible Operating System (EOS)
Arista CloudEOS VM
Arista Extensible Operating System (EOS)
Arista CloudEOS VM
Detailed vulnerability description
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.
How to mitigate CVE-2025-5089
Install security update from vendor's website.