Vulnerability · Published Jun 5, 2026 · Assigned by Arista
CVE-2025-5089Arista EOS SysDB Agent Denial of Service via Malformed CVX Client/Server Messages
Medium 6.5
In plain English
A medium-severity improper input validation in EOS / CloudVision eXchange (CVX) from Arista Networks. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 14% of all known vulnerabilities).
Official description
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Arista Networks | EOS / CloudVision eXchange (CVX) | 4.34.0F – through 4.34.1F4.33.0M – through 4.33.4M4.32.0M – through 4.32.6M4.31.0M – through 4.31.8M4.30.0 – before 4.31.0 |
Weakness: CWE-20 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H