CVE-2026-3841

Command Injection Vulnerability in Telnet CLI on TP-Link TL-MR6400

State: Published
Severity: 8.5 High
Published: Mar 12, 2026
Updated: Mar 13, 2026
Reserved: Mar 9, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	8.5 High	CVSS:4.0/AV:A/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N	TPLink

Weaknesses

CWE-78 Improper neutralization of special elements used in an OS command ('OS command injection')

Affected Products

Product	Versions
TL-MR6400 v5.3TP-Link Systems Inc.	before 1.9.0 Build 260108Affected

References

https://www.tp-link.com/en/support/download/tl-mr6400/v5.30/#Firmwarepatch
https://www.tp-link.com/us/support/faq/5016/vendor-advisory

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