RCE in TP-Link Tl-Mr6400
CVE-2026-3841
A command injection vulnerability has been identified in the Telnet command-line interface (CLI) of TP-Link TL-MR6400 v5.3. This issue is caused by insufficient sanitization of data processed during specific CLI operations. An authenticated attacker with elevated privileges may be able to execute arbitrary system commands. Successful exploitation may lead to full device compromise, including potential loss of confidentiality, integrity, and availability.
Vulnerability class: Command Injection (OS Command Injection)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.027 (85.7th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 86th percentile — 85.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.018 · newest: 0.027 · change: +0.010
Affected products
- TP-Link Tl-Mr6400 — versions 5.3
- TP-Link Tl-Mr6400 Firmware
- TP-Link Systems Inc. Tl-Mr6400 V5.3 — versions 0
Weakness classification (CWE)
References
- f23511db-6c3e-4e32-a477-6aa17d310630 (Product, patch)
- f23511db-6c3e-4e32-a477-6aa17d310630 (vendor-advisory, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-3841?
- CVE-2026-3841 is a high-severity vulnerability in TP-Link Tl-Mr6400, classified under OS Command Injection. CVSS score: 8.8/10. Published 2026-03-12.
- How severe is CVE-2026-3841?
- High severity. CVSS v3 base score is 8.8 out of 10.