CVE-2026-51601
HighCVSS 7.5Exploitation Probability (EPSS)
Low risk33th percentile - higher than 33% of all known CVEs
Summary
Tenda CP3 V3.0 firmware V31.1.9.91 contains a stack-based buffer overflow 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, which can cause the service to crash.
Risk Assessment
An unauthenticated remote attacker who has completed a standard RTSP session handshake can send a PLAY request with an excessively long clock= value, crashing the RTSP service and potentially disrupting camera functionality.
Recommendation
Update the Tenda CP3 firmware to the latest version if a patch is available. Until then, restrict RTSP service access to trusted networks only.
Other vulnerabilities in Tenda CP3
See all- CVE-2026-51606High
An improper input handling vulnerability in the RTSP service of Tenda CP3 V3.0 (firmware V31.1.9.91) causes the device to abruptly terminate the TCP connection with a RST packet when a request containing an oversized field value is received, without returning any RFC 2326-compliant error response. This behavior affects the request-line URL field and header field values across multiple RTSP request types.
- CVE-2026-51605High
A stack-based buffer overflow vulnerability in the RTSP service of Tenda CP3 V3.0 (firmware V31.1.9.991) allows an unauthenticated remote attacker to cause a denial of service via a crafted TEARDOWN request.
- CVE-2026-51604High
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 PLAY request.
- CVE-2026-51603High
A stack-based buffer overflow vulnerability exists in the RTSP service of Tenda CP3 V3.0 (firmware V31.1.9.91). An unauthenticated remote attacker can cause a denial of service by sending a crafted second SETUP request, crashing the RTSP service.
- CVE-2026-51602High
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 SETUP request. The second-stage URL parser fails to validate the URL length, enabling an attacker to bypass first-stage validation and trigger a stack buffer overflow, causing an immediate crash of the RTSP service and making the device inaccessible to all clients on the local network.
- CVE-2026-51600High
Tenda CP3 V3.0 firmware V31.1.9.91 fails to validate the Content-Length header in RTSP requests (DESCRIBE, SETUP, PLAY). When a request includes this header without a body, the RTSP parser enters a persistent body-awaiting state, permanently blocking the TCP connection. An unauthenticated remote attacker can exploit this to exhaust TCP resources and cause a denial-of-service condition.
Original NVD description (English source)
Tenda CP3 V3.0 firmware V31.1.9.91 contains a stack-based buffer overflow 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.