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PatchSiren cyber security CVE debrief

CVE-2026-51601 Tenda CVE debrief

CVE-2026-51601 is a stack-based buffer overflow vulnerability in Tenda CP3 V3.0 firmware V31.1.9.91. The RTSP service fails to validate the length of the clock= value in the Range header field when processing a PLAY request. An unauthenticated remote attacker can send a PLAY request with an excessively long clock= value to cause the RTSP service to crash. This vulnerability has a high impact on affected systems and requires immediate attention.

Vendor
Tenda
Product
CP3 V3.0 firmware
CVSS
HIGH 7.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-09
Original CVE updated
2026-07-10
Advisory published
2026-07-09
Advisory updated
2026-07-10

Who should care

Users of Tenda CP3 V3.0 firmware V31.1.9.91 should apply patches or mitigations to prevent exploitation. This includes operators, security teams, and platform administrators who manage or monitor affected systems.

Technical summary

The Tenda CP3 V3.0 firmware V31.1.9.91 contains a stack-based buffer overflow vulnerability 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. An unauthenticated remote attacker who has completed a standard RTSP session handshake can send a PLAY request with an excessively long clock= value to cause the RTSP service to crash. This vulnerability is highly exploitable and can lead to a denial-of-service condition.

Defensive priority

High

Recommended defensive actions

  • Apply patches or updates provided by the vendor
  • Implement network segmentation to limit access to vulnerable systems
  • Monitor RTSP service logs for suspicious activity
  • Consider using a web application firewall to detect and prevent attacks
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record was published on 2026-07-09T17:16:59.810Z and was last modified on 2026-07-10T17:41:47.303Z. The NVD entry is currently Deferred. Evidence is limited to CVE and NVD details. Defenders should verify system exposure and review vendor advisories for patching guidance.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-51601 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-51601

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-51601 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-51601

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.