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CVE-2026-5039

TP-Link Tl-wr841n Firmware vulnerability

8.8 HIGHEPSS 0.21%
  1. Published23 Apr 2026

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.

CVSS 3.1 breakdown

Attack vectorAdjacent
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

TP-Link Tl-wr841n Firmware< 231120

Remediation

Fixed in
TP-Link Tl-wr841n Firmware≥ 231120

References

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Frequently asked

Is CVE-2026-5039 being actively exploited?

CVE-2026-5039 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.21%.

How severe is CVE-2026-5039?

CVE-2026-5039 has a CVSS 3.1 base score of 8.8, rated high. EPSS estimates a 0.21% probability of exploitation.

Which products are affected by CVE-2026-5039?

Affected products include TP-Link Tl-wr841n Firmware.

How do I fix CVE-2026-5039?

Upgrade affected software to a fixed version, for example TP-Link Tl-wr841n Firmware 231120 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-5039 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.