Arista EOS SysDB Agent Denial of Service via Malformed CVX Client/Server Messages
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.
The recommended resolution is to upgrade to a remediated software version at your earliest convenience. CVE-2025-5089 has been fixed in the following releases:
* 4.34.2F and later releases in the 4.34.x train
* 4.33.5M and later releases in the 4.33.x train
* 4.32.7M and later releases in the 4.32.x train
* 4.31.9M and later releases in the 4.31.x train
Configurations
In order to be vulnerable to CVE-2025-5089, the following condition must be met: CVX must be configured:
cvx1#show cvx
Status: Enabled
Mode: Standalone
Heartbeat interval: 20.0
Heartbeat timeout: 60.0
Client connection state preserving: Disabled
cvx1#show running-config section cvx
cvx
no shutdown