CVE-2026-3841

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

Published Mar 12, 2026 CVSS 4.0 · 8.5 High EPSS 1.9% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Tp-link tl-mr6400 Firmware
CPEs cpe:2.3:h:tp-link:tl-mr6400:5.3:*:*:*:*:*:*:*
cpe:2.3:o:tp-link:tl-mr6400_firmware:*:*:*:*:*:*:*:*
Vendors & Products Tp-link tl-mr6400 Firmware
Metrics cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Tp-link
Tp-link tl-mr6400
Vendors & Products Tp-link
Tp-link tl-mr6400
Type Values Removed Values Added
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.
Title Command Injection Vulnerability in Telnet CLI on TP-Link TL-MR6400
Weaknesses CWE-78
References
Metrics cvssV4_0

{'score': 8.5, 'vector': '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
TPLink
Published
Updated
Mar 13, 2026, 2:35 PM
Reserved
Mar 9, 2026, 5:28 PM
Status
Analyzed
Published
Mar 12, 2026, 6:16 PM
Modified
Jun 17, 2026, 10:44 AM