CVE-2026-5039
HIGHDescription
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.
How to fix
TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works
Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.
CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Exploit Intelligence
Low risk: more likely to be exploited than 3% of all known CVEs.
References
Related Vulnerabilities
Other CWE-1394 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2024-48956 | Critical | 9.8 | 0.9% | - | - |
| CVE-2025-44954 | Critical | 9.0 | 0.7% | - | Fix |
| CVE-2024-11619 | Medium | 5.0 | 0.7% | - | - |
| CVE-2024-29037 | Critical | 9.1 | 0.6% | - | Fix |
| CVE-2023-6451 | High | 8.6 | 0.5% | - | Fix |
| CVE-2026-75870 | Critical | 9.1 | 0.5% | - | - |
Common questions
How do I fix CVE-2026-5039?
Upgrade tl-wr841n firmware to 231120 or later.
Is CVE-2026-5039 being actively exploited?
Not that we know of. CVE-2026-5039 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.13% is the estimated probability that it will be exploited in the next 30 days. That is higher than 3% of all scored CVEs.
How severe is CVE-2026-5039?
CVE-2026-5039 has a CVSS v3 base score of 8.8, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
What does CVE-2026-5039 affect?
Published advisories record a fix for tl-wr841n firmware (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.
Embed a live status badge for CVE-2026-5039
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-05.