What’s Vulnerable › Vulnerabilities
CVE-2026-5039: Predictable Default Cryptographic Key Used for DES Encryption in TP-Link TL-WL841N
- Severity: high (CVSS 8.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.1% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-04-23 · updated 2026-10-25
- Weakness: CWE-1394
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
- TP-Link TL-WR841N: before 231120 — fixed in 231120
How to fix
Upgrade to a fixed version: TP-Link TL-WR841N 231120. Check the vendor advisory for mitigations.
References
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