CVE-2026-5039: TP-Link TL-WR841N v13 uses DES-CBC encryption in the TDDPv2 debug protocol with a cryptographic key derived fr

Q: How do I fix CVE-2026-5039?

tl-wr841n firmware: upgrade to 231120. Exact commands for each OS are on this page.

Q: Is CVE-2026-5039 being exploited?

CVE-2026-5039 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-5039 affect?

CVE-2026-5039 affects tl-wr841n firmware. Severity is high (CVSS 8.8). 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 a

Routine

HIGH 8.8UPGRADE

CVE-2026-5039 is a high-severity flaw (CVSS 8.8) affecting tl-wr841n firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Adjacent network
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.1% (top 97%)
CISA exploited list	No
Weakness	CWE-1394
Published	2026-04-23
Last modified	2026-10-25

Publisher (CNA): TPLink · Vendor: tp-link

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-23 18:16 UTCPublished CVE record published
2026-10-25 23:10 UTCUpdated Record last modified

tp-link tl-wr841n firmware UPGRADE

Affected: < 231120

Fixed in: 231120

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-5039?

tl-wr841n firmware: upgrade to 231120. Exact commands for each OS are on this page.

Is CVE-2026-5039 being exploited?

CVE-2026-5039 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-5039 affect?

CVE-2026-5039 affects tl-wr841n firmware. Severity is high (CVSS 8.8). 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 a

How urgent is CVE-2026-5039?

Priority 31/100. High severity

Software pages

TP-Link vulnerabilities

Related CVEs

CVE-2026-9105 MEDIUM 6.5 UPGRADE An authenticated stack-based buffer overflow vulnerability exists in the web management interface of TP-Link T

References

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