CVE-2025-12611: Tenda AC21 Firmware

Critical severity, CVSS 9.8. EPSS: 0.7% chance of exploitation in the next 30 days.

A vulnerability was identified in Tenda AC21 16.03.08.16. This vulnerability affects the function formSetPPTPServer of the file /goform/SetPptpServerCfg. The manipulation of the argument startIp leads to buffer overflow. Remote exploitation of the attack is possible. The exploit is publicly available and might be used.

Affected products

• Tenda AC21 Firmware: version 16.03.08.16 only

Published 2025-11-03. Last modified 2026-06-17.