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.
CVE-2026-51600
HIGHPre-NVD 7.5Trending — 4 sources updated this weekElevated
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.5Exploit: NoneExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 7.5
- EG Score
- 0.0(none)
- EPSS
- 32.5%
- KEV
- Not listed
Published
July 9, 2026
Last Modified
July 10, 2026
Advisory Details (1)
Auto-updated Jul 9, 2026🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available
cve_ID_report/Tenda_CP3_V3.0/Tenda_CP3_V3.0/Tenda_CP3_V3.0_1th/README.md at main · kkkk2222874/cve_ID_report · GitHub
https://github.com/kkkk2222874/cve_ID_report/blob/main/Tenda_CP3_V3.0/Tenda_CP3_V3.0/Tenda_CP3_V3.0_1th/README.mdVendor Advisories for CVE-2026-51600(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Weakness Classification(2)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 6× in last 7d / 6× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-07-11 08:27 UTCEPSS rescore
- 2026-07-11 08:27 UTCEPSS rescore
- 2026-07-09 18:00 UTCMITRE cvelistV5CVSS v3 → 7.5 · severity → HIGH
- 2026-07-09 17:54 UTCNVD update
- 2026-07-09 17:18 UTCEG score recompute
- 2026-07-09 17:15 UTCMITRE cvelistV5first tracked
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Same CWE
10 shownCWE-400
Frequently asked(5)
What is CVE-2026-51600?
CVE-2026-51600 is a high vulnerability published on July 9, 2026. 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…
When was CVE-2026-51600 disclosed?
CVE-2026-51600 was first published in the National Vulnerability Database on July 9, 2026, with the most recent update on July 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-51600 actively exploited?
CVE-2026-51600 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 32.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-51600?
CVE-2026-51600 has a CVSS v3.1 base score of 7.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 0.0.
How do I remediate CVE-2026-51600?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-51600, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-51600
Is Your Infrastructure Affected by CVE-2026-51600?
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