Executive brief
Tenda F3 wireless routers are affected by a security flaw in their network management interface. An attacker could potentially crash the device or gain unauthorized control by sending specially crafted network configuration data. This could lead to a loss of internet connectivity for connected users or allow an attacker to intercept network traffic.
Technical details
A classic buffer overflow (CWE-120) exists in the Tenda F3 router firmware, specifically within the 'goform/setNAT' endpoint. The vulnerability is triggered by providing an overly long string to the 'macFilterList' parameter, which the application fails to properly bounds-check before copying into memory. While the attack vector is listed as network-based, the CVSS score reflects high complexity, likely due to specific configuration requirements or environmental factors needed to reach the vulnerable code path. Successful exploitation could lead to memory corruption, resulting in a denial-of-service (DoS) condition or potentially remote code execution (RCE). As of the advisory date, the vendor has not officially confirmed a patch for this specific version range.
Affected products
- Tenda F3 Firmware 12.01.01.48_multi and later
Timeline
- 2025-09-10: advisory
- 2025-09-10: disclosed