CVE-2026-51600

Published Jul 9, 2026 CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Description
Tenda CP3 V3.0 firmware V31.1.9.91 does not validate the Content-Length header field in RTSP requests (including DESCRIBE, SETUP, and PLAY methods). When a request carrying a Content-Length header is received without a corresponding message body, the RTSP parser enters a persistent body-awaiting state, causing the affected TCP connection to become permanently non-functional. The device does not actively close the connection, resulting in a TCP resource leak. This issue can be exploited by an unauthenticated remote attacker to cause a denial-of-service condition.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Title Unvalidated RTSP Content‑Length Header Causes Denial of Service on Tenda CP3 V3.0
Type Values Removed Values Added
Title Unvalidated RTSP Content‑Length Header Causes Denial of Service on Tenda CP3 V3.0
Type Values Removed Values Added
Title Denial‑of‑Service via Unvalidated RTSP Content‑Length Header in Tenda CP3 Firmware
Type Values Removed Values Added
Title Denial‑of‑Service via Unvalidated RTSP Content‑Length Header in Tenda CP3 Firmware
Type Values Removed Values Added
Title RTSP Content-Length Parsing Vulnerability Causes Denial of Service
Type Values Removed Values Added
Title RTSP Content-Length Parsing Vulnerability Causes Denial of Service
Type Values Removed Values Added
Title RTSP Content-Length Header Exploit Causes TCP Resource Leak and Denial of Service on Tenda CP3
Type Values Removed Values Added
Title RTSP Content-Length Header Exploit Causes TCP Resource Leak and Denial of Service on Tenda CP3
Type Values Removed Values Added
Title RTSP Content‑Length Header Exploit Causes Device Denial of Service
Type Values Removed Values Added
Title RTSP Content‑Length Header Exploit Causes Device Denial of Service
Type Values Removed Values Added
First Time appeared Tenda
Tenda cp3 V3
Vendors & Products Tenda
Tenda cp3 V3
Type Values Removed Values Added
Weaknesses CWE-400
CWE-703
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description Tenda CP3 V3.0 firmware V31.1.9.91 does not validate the Content-Length header field in RTSP requests (including DESCRIBE, SETUP, and PLAY methods). When a request carrying a Content-Length header is received without a corresponding message body, the RTSP parser enters a persistent body-awaiting state, causing the affected TCP connection to become permanently non-functional. The device does not actively close the connection, resulting in a TCP resource leak. This issue can be exploited by an unauthenticated remote attacker to cause a denial-of-service condition.
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
mitre
Published
Updated
Jul 9, 2026, 5:43 PM
Reserved
Jun 8, 2026, 12:00 AM
Status
Deferred
Published
Jul 9, 2026, 5:16 PM
Modified
Jul 10, 2026, 5:41 PM