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.

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)

EPSS: 0.018 (75.9th percentile) — read the EPSS interpretation.

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.

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)

CWE-78 — OS Command Injection

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.