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.
Published: 2026-07-09
Score: 7.5 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Sun, 12 Jul 2026 07:45:00 +0000

Type Values Removed Values Added
Title RTSP Content-Length Header Exploit Causes TCP Resource Leak and Denial of Service on Tenda CP3

Sat, 11 Jul 2026 19:45:00 +0000

Type Values Removed Values Added
Title RTSP Content‑Length Header Exploit Causes Device Denial of Service

Sat, 11 Jul 2026 04:30:00 +0000

Type Values Removed Values Added
Title RTSP Content‑Length Header Exploit Causes Device Denial of Service

Fri, 10 Jul 2026 10:15:00 +0000

Type Values Removed Values Added
First Time appeared Tenda
Tenda cp3 V3
Vendors & Products Tenda
Tenda cp3 V3

Thu, 09 Jul 2026 18:30:00 +0000

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'}


Thu, 09 Jul 2026 17:15:00 +0000

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

cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-07-09T17:43:42.929Z

Reserved: 2026-06-08T00:00:00.000Z

Link: CVE-2026-51600

cve-icon Vulnrichment

Updated: 2026-07-09T17:43:35.809Z

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-07-12T07:30:05Z

Weaknesses