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

Source: https://junglewise.ai/threats/cve-2026-5039-tp-link-tl-wr841n-v13-uses-des-cbc-encryption-in-the-tddpv2-debug  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-04-23  
License: CC BY 4.0 with a link back

CVE-2026-5039 · Severity: high · CVSS 8.8 · Published 2026-04-23

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.

Technologies: [TP-Link TL-WR841N](https://junglewise.ai/threats/technologies/tl-wr841n). Vendors: [TP-Link](https://junglewise.ai/threats/vendors/tp-link).

## Quick answers

**Is CVE-2026-5039 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-5039 being exploited in the wild.

**How severe is CVE-2026-5039?** High severity, with a CVSS score of 8.8, published 23 April 2026.

**Which products and versions are affected?** TP-Link TL-WR841N, TP-Link Tl-Wr841n Firmware. The advisory does not name versions.

**Is there a fix for CVE-2026-5039?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**Am I affected by CVE-2026-5039?** Check whether you run TP-Link TL-WR841N or TP-Link Tl-Wr841n Firmware. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- TP-Link TL-WR841N
- TP-Link Tl-Wr841n Firmware

## Related threats

- [TP-Link TL-WR841N OS command injection in IPv6 WAN configuration](https://junglewise.ai/threats/cve-2026-102294-tp-link-tl-wr841n-contains-an-authenticated-os-command-injection)
- [TP-Link TL-WR841N buffer overflow in HTTP service](https://junglewise.ai/threats/cve-2026-76651-tp-link-tl-wr841n-buffer-overflow-in-http-service)
- [TP-Link TL-WR841N v14 NULL pointer dereference in UPnP](https://junglewise.ai/threats/cve-2026-76650-tp-link-tl-wr841n-v14-null-pointer-dereference-in-upnp)
- [TP-Link TL-WR841N NULL pointer dereference in UPnP service](https://junglewise.ai/threats/cve-2026-76649-tp-link-tl-wr841n-null-pointer-dereference-in-upnp-service)
- [TP-Link TL-WR841N stack overflow in web management interface](https://junglewise.ai/threats/cve-2026-9105-tp-link-tl-wr841n-stack-overflow-in-web-management-interface)