CVE-2026-7100 is a high-severity buffer overflow vulnerability affecting Tenda F456 firmware version 1.0.0.5. The vulnerability resides in the fromNatlimitof function of the /goform/Natlimit file within the httpd component. Remote attackers can exploit this flaw without authentication or user interaction, potentially leading to severe consequences such as code execution or denial of service. The vulnerability has a CVSS 4.0 base score of 8.7, indicating high impact and exploitability. While a proof-of-concept exploit is publicly available, no official patch or remediation has been disclosed by the vendor to date.

Successful exploitation of this buffer overflow vulnerability could allow remote attackers to execute arbitrary code or cause a denial of service on affected Tenda F456 devices running version 1.0.0.5. The vulnerability does not require user interaction and has a high attack vector score, increasing the risk of remote compromise. However, there are currently no reports of active exploitation in the wild.

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, such as restricting remote access to the httpd service. Monitor vendor communications for updates regarding patches or official mitigations.