CVE-2026-51603: n/a
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.
AI Analysis
Technical Summary
This vulnerability exists in the RTSP service of Tenda CP3 V3.0 (firmware V31.1.9.91). After a legitimate OPTIONS, DESCRIBE, and first SETUP request establish a valid session ID, the second SETUP request's URL routing parser fails to properly validate the length of the URL field. By sending a URL composed of four consecutive repetitions of a valid RTSP URL, an attacker can bypass first-stage format validation and trigger a stack-based buffer overflow. This overflow causes the RTSP service process to crash immediately, leading to denial of service and loss of device accessibility on the local network.
Potential Impact
The vulnerability allows an unauthenticated remote attacker to cause a denial of service by crashing the RTSP service on the affected device. This results in the device becoming inaccessible to all clients on the local network relying on the RTSP service. There is no information about code execution or other impacts.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or workaround information is provided at this time.
CVE-2026-51603: n/a
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.
CVSS v3.1
Score 7.5high
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability exists in the RTSP service of Tenda CP3 V3.0 (firmware V31.1.9.91). After a legitimate OPTIONS, DESCRIBE, and first SETUP request establish a valid session ID, the second SETUP request's URL routing parser fails to properly validate the length of the URL field. By sending a URL composed of four consecutive repetitions of a valid RTSP URL, an attacker can bypass first-stage format validation and trigger a stack-based buffer overflow. This overflow causes the RTSP service process to crash immediately, leading to denial of service and loss of device accessibility on the local network.
Potential Impact
The vulnerability allows an unauthenticated remote attacker to cause a denial of service by crashing the RTSP service on the affected device. This results in the device becoming inaccessible to all clients on the local network relying on the RTSP service. There is no information about code execution or other impacts.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or workaround information is provided at this time.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mitre
- Date Reserved
- 2026-06-08T00:00:00.000Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a4fd7dd68715ace43c4445d
Added to database: 07/09/2026, 17:18:21 UTC
Last enriched: 07/09/2026, 17:32:30 UTC
Last updated: 07/09/2026, 18:11:36 UTC
Views: 5
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