# CVE-2026-51603: Tenda CP3 stack buffer overflow in RTSP service

Source: https://junglewise.ai/threats/cve-2026-51603-tenda-cp3-stack-buffer-overflow-in-rtsp-service  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-09. Updated: 2026-07-09  
License: CC BY 4.0 with a link back

CVE-2026-51603 · Severity: info · CVSS 0 · Published 2026-07-09

A security vulnerability exists in the Tenda CP3 IP camera, a device used for home and office surveillance. An attacker on the same network can send a specially crafted series of video streaming requests to crash the camera's communication service. This results in a denial of service, making the camera inaccessible to the official mobile app and other monitoring software until the device is recovered.

Technologies: [Tenda CP3](https://junglewise.ai/threats/technologies/cp3). Vendors: [Tenda](https://junglewise.ai/threats/vendors/tenda).

## Quick answers

**Is CVE-2026-51603 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-51603 being exploited in the wild.

**How severe is CVE-2026-51603?** Informational severity, with a CVSS score of 0, published 9 July 2026.

**Which products and versions are affected?** Tenda CP3 V31.1.9.91.

**Is there a fix for CVE-2026-51603?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-51603 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-51603?** Check whether you run Tenda CP3 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A stack-based buffer overflow exists in the RTSP service of Tenda CP3 V3.0 firmware V31.1.9.91. The vulnerability is located in the second-stage URL routing parser, which fails to validate the length of the URL field during a second SETUP request. To exploit this, an attacker must first complete the OPTIONS, DESCRIBE, and an initial legitimate SETUP handshake to obtain a valid session ID. By then sending a second SETUP request containing a URL composed of four consecutive repetitions of a valid RTSP URL, the attacker bypasses first-stage format validation and triggers the overflow. This results in an immediate crash of the RTSP process (typically on port 554), leading to a denial of service.

## Affected products

- Tenda CP3 V3.0 V31.1.9.91

## Timeline

- 2026-07-09: disclosed
- 2026-07-09: advisory

## References

- [https://github.com/kkkk2222874/cve_ID_report/blob/main/Tenda_CP3_V3.0/Tenda_CP3_V3.0_4th/README.md](https://github.com/kkkk2222874/cve_ID_report/blob/main/Tenda_CP3_V3.0/Tenda_CP3_V3.0_4th/README.md)

## Related threats

- [Tenda CP3 privilege escalation in redirect server](https://junglewise.ai/threats/cve-2026-86153-tenda-cp3-privilege-escalation-in-redirect-server)
- [Tenda CP3 OS command injection in AutoAddWifi](https://junglewise.ai/threats/cve-2026-86152-tenda-cp3-os-command-injection-in-autoaddwifi)
- [Tenda CP3 OS command injection in Network Configuration Management](https://junglewise.ai/threats/cve-2026-86151-tenda-cp3-os-command-injection-in-network-configuration)
- [Tenda CP3 hard-coded credentials in hostapd configuration](https://junglewise.ai/threats/cve-2026-86150-tenda-cp3-hard-coded-credentials-in-hostapd-configuration)
- [Tenda CP3 OS command injection via interface_name argument](https://junglewise.ai/threats/cve-2026-86149-tenda-cp3-os-command-injection-via-interface-name-argument)