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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.

PUBLISHED Reserved 2026-03-27 | Published 2026-04-23 | Updated 2026-04-23 | Assigner TPLink




MEDIUM: 6.1CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:H/SC:N/SI:N/SA:N

Problem types

CWE-1394 Use of default cryptographic key

Product status

Default status
unaffected

Any version before 0.9.1 Build 20231120 Rel.62366
affected

References

www.tp-link.com/us/support/download/tl-wr841n/v13/ patch

cve.org (CVE-2026-5039)

nvd.nist.gov (CVE-2026-5039)

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