CVE-2026-85109: Buffer Overflow in Tenda HG10

This vulnerability affects the Tenda HG10 device's Boa Web Server, specifically the formLogin function in the /boaform/formLogin file. An attacker can remotely trigger a buffer overflow by manipulating the Username parameter, potentially leading to arbitrary code execution or denial of service. The vulnerability has a CVSS 4.0 score of 9.3, indicating critical severity. Although the exploit is publicly known, no vendor-provided fix or mitigation details are currently available.

Successful exploitation of this buffer overflow vulnerability could allow an unauthenticated remote attacker to execute arbitrary code or cause a denial of service on the affected device. Given the critical CVSS score and public exploit disclosure, the risk of exploitation is significant. However, there is no evidence of active exploitation in the wild at this time.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, users should consider limiting network exposure of the affected device and monitor for unusual activity. No vendor-provided mitigation or temporary fix is currently available.