CVE-2025-5089 MEDIUM

CVE-2025-5089: Arista EOS SysDB Agent Denial of Service via Malformed CVX Client/Server Messages

Vendor Arista Networks
Product EOS / CloudVision eXchange (CVX)
Weakness CWE-20 · Input validation
Published June 5, 2026
Last update June 9, 2026

CVSS base score

6.5/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality None
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

What the vulnerability does

01Description

In a CVX cluster, an EOS switch connected to a CVX server is not resilient to certain malformed messages received from the connected CVX server. Similarly, the CVX server is not resilient to certain malformed messages received from the connected EOS switch. This leads to either a Sysdb agent crash on the EOS device causing a soft reset of the switch or agent crashes on the CVX server causing instability of the CVX cluster. An attacker could use this behavior to create a denial of service (DoS) scenario. Note that this would require the attacker to already have a high privilege access to the connected device to be able to send custom TCP packets. EOS switches that are not connected to a CVX server are not impacted.

Key dates

02Disclosure timeline

June 5, 2026 CVE published
June 9, 2026 Record updated