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CVE-2026-123966 – Heap-Based Buffer Overflow (Unauthenticated RCE Risk) – Tenda AC19 16.03.10.07

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Summary

CVE-2026-123966 is a heap-based buffer overflow in the Tenda AC19 router, firmware version 16.03.10.07. The flaw is in the saveParentControlInfo function and can be exploited remotely without authentication. It is rated Critical (CVSS 10.0), and a public exploit is available.

Note: the CVE record names the Tenda AC19, not the AC1206. No source found during research ties this CVE to the AC1206.

Technical details

  • Root cause: improper handling of the deviceId parameter in the saveParentControlInfo function, which causes a heap-based buffer overflow (CWE-122, CWE-119).
  • Vulnerable endpoint: /goform/saveParentControlInfo.
  • Trigger: a crafted request that manipulates the deviceId argument.
  • Attack vector: network. The attack can be launched remotely and needs no authentication or user interaction.
  • Impact: the CVSS vector rates confidentiality, integrity and availability impact as High. The sources reviewed do not describe a specific exploitation outcome.
  • A public exploit has been published on GitHub.

Affected software

  • Tenda AC19 firmware 16.03.10.07

Severity

  • CVSS v3.1 base score: 10.0 (Critical). The v3.1 vector string was not available in the sources reviewed.
  • CVSS v4.0 base score: 10.0 (Critical), vector CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P

Mitigation and recommended actions

  • Immediate: no fixed firmware version is listed in the sources reviewed. Check the Tenda website for firmware updates and apply one as soon as it is available.
  • Until a fix is available, as general hardening:
    • Do not expose the router’s web management interface to the internet.
    • Restrict access to /goform/ endpoints to trusted internal networks.
    • Consider replacing affected devices if no fix is released.

References

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