Vulnerability · Published Apr 23, 2026 · Assigned by TPLink
CVE-2026-5039Predictable Default Cryptographic Key Used for DES Encryption in TP-Link TL-WL841N
Medium 6.1
In plain English
A medium-severity security flaw in TL-WL841N v13 from TP-Link Systems Inc.. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 3% of all known vulnerabilities).
Official description
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 (as reported)
| Vendor | Product | Versions |
|---|---|---|
| TP-Link Systems Inc. | TL-WL841N v13 | 0 – before 0.9.1 Build 20231120 Rel.62366 |
Weakness: CWE-1394 · 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