Tenda F456 Routers Hit by Critical Buffer Overflow

A high-severity stack-based buffer overflow (CVE-2026-6198) has been identified in Tenda F456 routers, specifically affecting version 1.0.0.5. According to the National Vulnerability Database, this critical flaw resides within the fromNatStaticSetting function of the /goform/NatStaticSetting file. The vulnerability can be triggered by manipulating the page argument, leading to a remote attack vector.

With a CVSSv3.1 score of 8.8 (HIGH), this vulnerability poses a significant risk. The nature of the flaw — a stack-based buffer overflow — is a classic attack vector, often leading to remote code execution (RCE) if exploited successfully. Given that the exploit has been publicly disclosed, the window for threat actors to weaponize this is wide open. This isn’t just a theoretical vulnerability; it’s actively out there in the wild, waiting for an opportune moment.