CVE-2026-51603 Memory corruption in n/a
An unauthenticated remote attacker can crash the RTSP service on Tenda CP3 cameras by sending a crafted SETUP request, causing denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-51603?
CVE-2026-51603 is a high-severity memory corruption vulnerability in n/a, published on 9 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A stack-based buffer overflow vulnerability in the RTSP service of Tenda CP3 V3.0 (firmware V31.1.9.91) allows an unauthenticated remote attacker to cause a denial of service via a crafted second SETUP request. After completing the OPTIONS, DESCRIBE, and a legitimate first SETUP request to obtain a valid session ID, the RTSP service's second-stage URL routing parser fails to validate the length of the URL field in the subsequent SETUP request. By supplying a URL consisting of exactly four consecutive repetitions of a valid RTSP URL, an attacker can bypass first-stage format validation and trigger a stack buffer overflow, causing an immediate crash of the RTSP service process and rendering the device inaccessible to all clients on the local network.
Weakness: CWE-121
Which versions are affected by CVE-2026-51603?
How do I fix CVE-2026-51603?
No fix has been published for CVE-2026-51603 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-51603 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-51603 exists.
Sources
Also known as GHSA-vmqq-vpj5-fgxw.