Vulnerability in TP-Link Tl-Wr841n
CVE-2026-5039
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.002 (9.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 10th percentile — 9.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.001 · newest: 0.002 · change: +0.001
Affected products
- TP-Link Tl-Wr841n — versions 13.0
- TP-Link Tl-Wr841n Firmware
- TP-Link Systems Inc. Tl-Wl841n V13 — versions 0
Weakness classification (CWE)
References
- f23511db-6c3e-4e32-a477-6aa17d310630 (Product, patch)
Frequently asked questions
- What is CVE-2026-5039?
- CVE-2026-5039 is a high-severity vulnerability in TP-Link Tl-Wr841n, classified under CWE-1394. CVSS score: 8.8/10. Published 2026-04-23.
- How severe is CVE-2026-5039?
- High severity. CVSS v3 base score is 8.8 out of 10.