# CVE-2026-5039

> Vulnerability · severity: **HIGH** (CVSS 8.8).

## 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.

## Key facts

- **CVE ID:** CVE-2026-5039
- **Published:** 2026-04-23
- **CVSS severity:** HIGH
- **CVSS base score:** 8.8
- **CWE codes:** CWE-1394

## Affected products

- `tp-link:tl-wr841n_firmware`
- `tp-link:tl-wr841n`

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-5039

## Citation

> AI Analytics. CVE-2026-5039. Retrieved 2026-07-26 from https://api.ai-analytics.org/cve/CVE-2026-5039. Derived from NIST NVD. Licensed CC0.

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