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CVE-2026-93740 – Unauthenticated Remote Buffer Overflow – TOTOLINK A3002MU Hh-B20211125.1046

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Summary

CVE-2026-93740 is a critical buffer overflow vulnerability in the formWlEncrypt function of the TOTOLINK A3002MU wireless router, firmware version Hh-B20211125.1046. The flaw allows an unauthenticated remote attacker to send a crafted HTTP request to the device’s embedded web management interface and corrupt memory, with public exploit code already available. The issue carries a maximum CVSS v3.1 base score of 10.0.

Technical details

  • Root cause: the formWlEncrypt handler, exposed via the device’s boa embedded web server at /boafrm/formWlEncrypt, copies the submit-url request argument into a fixed-size buffer without validating its length, resulting in a buffer overflow (CWE-120 / CWE-119).
  • Trigger condition: an attacker submits an HTTP POST request to /boafrm/formWlEncrypt with an oversized submit-url parameter.
  • Attack vector: network-based, requires no authentication and no user interaction, and can be launched remotely against the router’s exposed management interface.
  • Impact: successful exploitation can crash the device (denial of service) or, depending on exploitation technique, corrupt adjacent memory in a way that could enable further compromise of the device.

Affected software

  • TOTOLINK A3002MU — firmware version Hh-B20211125.1046

Severity

  • CVSS v3.1 Base Score: 10.0 (Critical)
  • Vector: AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: no official TOTOLINK firmware update addressing this specific vulnerability has been identified at the time of writing. Check TOTOLINK’s official support channels for a firmware update for the A3002MU and apply it as soon as one is released.
  • If no patch is available: restrict access to the router’s web management interface so it is not reachable from the internet or untrusted networks; disable remote/WAN administration; place the device behind a firewall or on a segmented/isolated network; and monitor for anomalous HTTP POST traffic to /boafrm/formWlEncrypt. Given the device’s exposure and lack of a confirmed patch, consider replacing end-of-life TOTOLINK hardware with actively supported equipment.

References

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