CVE-2026-86149

A security vulnerability has been detected in Tenda CP3 27.5.57.101. Impacted is an unknown function of the file custom-x/softap/hostapd. Such manipulation of the argument wpa_passphrase leads to hard-coded credentials. The attack can be launched remotely. The exploit has been disclosed publicly and may be used.

A vulnerability has been discovered in Tenda CP3 27.5.57.101 in the SystemAsh function of the file Apis/system.c of the Kylin component. Manipulation of the AlarmVoiceURL argument results in OS command injection. The attack can be launched remotely.

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.

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.

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.

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.

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.

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.

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.