CVE-2026-5039: TP-Link TL-WR841N Firmware

High severity, CVSS 8.8. EPSS: 0.2% chance of exploitation in the next 30 days.

TP-Link TL-WR841N v13 uses DES-CBC encryption in the TDDPv2 debug protocol with a cryptographic key derived from default web management credentials, making the key predictable if device is left in default configuration. A network-adjacent attacker can exploit this weakness to gain unauthorized access to the protocol, read debug data, modify certain device configuration values, and trigger device reboot, resulting in loss of integrity and a denial-of-service condition.

Affected products

• TP-Link TL-WR841N Firmware: before 231120 (fixed in 231120)

Published 2026-04-23. Last modified 2026-06-17.