CVE-2026-5039 MEDIUM

CVE-2026-5039: Predictable Default Cryptographic Key Used for DES Encryption in TP-Link TL-WL841N

Vendor Tp-Link Systems Inc.
Product TL-WL841N v13
Weakness CWE-1394
Published April 23, 2026
Last update April 28, 2026

CVSS base score

6.1/10
Attack vector Adjacent
Attack complexity Low
Privileges required None
User interaction None
Confidentiality
Integrity

CVSS vector

CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:H/SC:N/SI:N/SA:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

April 23, 2026 CVE published
April 28, 2026 Record updated