What’s Vulnerable › Vulnerabilities
CVE-2025-5089: Arista EOS SysDB Agent Denial of Service via Malformed CVX Client/Server Messages
- Severity: medium (CVSS 6.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-06-05 · updated 2026-10-07
- Weakness: CWE-20
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
- Arista Networks EOS / CloudVision eXchange (CVX): from 4.34.0F through 4.34.1F; from 4.33.0M through 4.33.4M; from 4.32.0M through 4.32.6M; from 4.31.0M through 4.31.8M; from 4.30.0 before 4.31.0 — fixed in 4.31.0
How to fix
Upgrade to a fixed version: Arista Networks EOS / CloudVision eXchange (CVX) 4.31.0. Check the vendor advisory for mitigations.
References
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