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CVE-2026-93741 – Remote Code Execution via Buffer Overflow – TOTOLINK A3002MU (Hh-B20211125.1046)

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Summary

CVE-2026-93741 is a critical buffer overflow vulnerability in the formWlWds function of the /boafrm/formWlWds endpoint on TOTOLINK A3002MU routers running firmware Hh-B20211125.1046. An unauthenticated remote attacker can send a crafted request manipulating the submit-url parameter to corrupt memory on the device. The vulnerability carries the maximum CVSS score of 10.0, and a public exploit is available.

Technical details

  • Root cause: The formWlWds handler in the device’s embedded "boa" web server copies the submit-url request parameter into a fixed-size buffer without validating its length (CWE-120 / CWE-119), leading to a buffer overflow.
  • Trigger conditions: An attacker submits an HTTP request to /boafrm/formWlWds with an oversized or crafted submit-url value.
  • Attack vector: Network-based; no authentication and no user interaction are required to exploit the flaw.
  • Impact: Memory corruption that can result in denial of service and, given the nature of the overflow, potential remote code execution or full device compromise.
  • Exploit status: Proof-of-concept exploit code has been publicly released.

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 vendor patch has been identified for this vulnerability at time of writing. Check TOTOLINK’s official support and firmware download channels regularly for an updated release addressing this issue and apply it as soon as it becomes available.
  • If no patch is available:
    • Do not expose the router’s web management interface (/boafrm/* endpoints) directly to the internet.
    • Restrict access to the administrative interface to trusted internal networks only, using firewall rules or a VPN.
    • Disable remote/WAN-side management if not strictly required.
    • Monitor for anomalous requests to /boafrm/formWlWds and other boafrm endpoints as a potential indicator of exploitation attempts.
    • Consider replacing end-of-life or unsupported TOTOLINK devices with actively maintained hardware.

References

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