# CVE-2026-5039

## Summary

- **CVE ID:** CVE-2026-5039
- **Severity:** MEDIUM
- **CVSS Score:** 6.1 (CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-1394
- **Published:** Apr 23, 2026
- **Last Modified:** Apr 28, 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.

## Affected Products

- TP-Link Systems Inc. — TL-WL841N v13 (0)

## References

- [CNA](https://www.tp-link.com/us/support/download/tl-wr841n/v13/#Firmware)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.13%
- **EPSS Percentile:** 2.9

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._