CVE-2026-51601 Tenda CVE debrief

Who should care

Users of Tenda CP3 V3.0 firmware V31.1.9.91 should apply patches or mitigations to prevent exploitation. This includes operators, security teams, and platform administrators who manage or monitor affected systems.

Technical summary

The Tenda CP3 V3.0 firmware V31.1.9.91 contains a stack-based buffer overflow vulnerability in the RTSP service. The device fails to validate the length of the clock= value in the Range header field when processing a PLAY request. An unauthenticated remote attacker who has completed a standard RTSP session handshake can send a PLAY request with an excessively long clock= value to cause the RTSP service to crash. This vulnerability is highly exploitable and can lead to a denial-of-service condition.

Defensive priority

High

Recommended defensive actions

• Apply patches or updates provided by the vendor
• Implement network segmentation to limit access to vulnerable systems
• Monitor RTSP service logs for suspicious activity
• Consider using a web application firewall to detect and prevent attacks
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record was published on 2026-07-09T17:16:59.810Z and was last modified on 2026-07-10T17:41:47.303Z. The NVD entry is currently Deferred. Evidence is limited to CVE and NVD details. Defenders should verify system exposure and review vendor advisories for patching guidance.

Official resources