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CVE-2026-5687 Tenda CVE debrief

A stack-based buffer overflow vulnerability has been identified in Tenda CX12L 16.03.53.12. The issue affects the function fromNatStaticSetting of the file /goform/NatStaticSetting. This manipulation of the argument page causes a stack-based buffer overflow. The attack may be initiated remotely. Network administrators and security teams should prioritize patching this vulnerability to prevent potential remote attacks.

Vendor
Tenda
Product
CX12L
CVSS
HIGH 7.4
CISA KEV
Not listed in stored evidence
Original CVE published
2026-04-06
Original CVE updated
2026-07-24
Advisory published
2026-04-06
Advisory updated
2026-07-24

Who should care

Network administrators and security teams responsible for Tenda CX12L devices should prioritize patching this vulnerability to prevent potential remote attacks. This includes reviewing network configurations, ensuring up-to-date firmware, and monitoring for suspicious activity.

Technical summary

The vulnerability is caused by a stack-based buffer overflow in the fromNatStaticSetting function of the /goform/NatStaticSetting file in Tenda CX12L 16.03.53.12. The attack vector is network-based, and the attack complexity is low. The vulnerability has a CVSS score of 7.4 and a severity of HIGH. Network administrators and security teams responsible for Tenda CX12L devices should prioritize patching this vulnerability to prevent potential remote attacks.

Defensive priority

High priority should be given to patching this vulnerability, as it can be exploited remotely and has a high CVSS score.

Recommended defensive actions

  • Apply the vendor-provided patch or update to a fixed version of the firmware.
  • Implement network segmentation to limit the attack surface.
  • Monitor network traffic and system logs for suspicious activity.
  • Consider implementing compensating controls, such as Web Application Firewalls (WAFs).
  • Conduct regular vulnerability assessments and penetration testing to identify potential vulnerabilities.
  • Review and update incident response plans to include procedures for responding to potential exploitation of this vulnerability.
  • Verify that all Tenda CX12L devices are properly configured and secured according to vendor guidelines.

Evidence notes

The CVE record was published on 2026-04-06T22:16:25.070Z and was last modified on 2026-07-24T09:10:00.153Z. The NVD entry is currently Analyzed. The vulnerability affects Tenda CX12L 16.03.53.12, specifically the fromNatStaticSetting function of the /goform/NatStaticSetting file. The attack vector is network-based, and the attack complexity is low. The CVSS score is 7.4, and the severity is HIGH. Evidence limits suggest remote exploitation is possible but detailed exploit steps are not verified.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-5687 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-5687

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

  • CVE-2026-5687 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-5687

    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.