CVE-2026-5039

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.

CVSS v3 8.8 HIGH

8.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.8 / Impact : 5.9

Attack Vector ADJACENT_NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://www.tp-link.com/us/support/download/tl-wr841n/v13/#Firmware	Product

Configurations

Configuration 1 (hide)

AND

cpe:2.3:o:tp-link:tl-wr841n_firmware:*:*:*:*:*:*:*:*

cpe:2.3:h:tp-link:tl-wr841n:13.0:*:*:*:*:*:*:*

History

05 May 2026, 14:11

Type	Values Removed	Values Added
CPE		cpe:2.3:h:tp-link:tl-wr841n:13.0:::::::* cpe:2.3:o:tp-link:tl-wr841n_firmware::::::::
First Time		Tp-link Tp-link tl-wr841n Tp-link tl-wr841n Firmware
References	~~() https://www.tp-link.com/us/support/download/tl-wr841n/v13/#Firmware -~~	() https://www.tp-link.com/us/support/download/tl-wr841n/v13/#Firmware - Product
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 8.8

23 Apr 2026, 18:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-04-23 18:16

Updated : 2026-05-05 14:11

NVD link : CVE-2026-5039

Mitre link : CVE-2026-5039

CVE.ORG link : CVE-2026-5039

JSON object : View

Products Affected

tp-link

tl-wr841n
tl-wr841n_firmware

CWE

CWE-1394

Use of Default Cryptographic Key

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