CVE-2025-3820: Tenda i24 Firmware

High severity, CVSS 8.8. EPSS: 12.7% chance of exploitation in the next 30 days.

A vulnerability was found in Tenda W12 and i24 3.0.0.4(2887)/3.0.0.5(3644) and classified as critical. Affected by this issue is the function cgiSysUplinkCheckSet of the file /bin/httpd. The manipulation of the argument hostIp1/hostIp2 leads to stack-based buffer overflow. The attack may be launched remotely. The exploit has been disclosed to the public and may be used.

Affected products

• Tenda i24 Firmware: version 3.0.0.4(2887) only; version 3.0.0.5(3644) only
• Tenda w12 Firmware: version 3.0.0.4(2887) only; version 3.0.0.5(3644) only

Published 2025-04-19. Last modified 2026-06-17.