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CVE-2026-3841

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

Published: Mar 12, 2026Updated: Apr 2, 2026 Sources: CVE List NVD BDUCWE-78
8.8HIGH
NVD MITRE
EPSS Score
1.8%
Top 24.7%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-78

Affected Products

TL-MR6400 v5.3TP-Link Systems Inc.Networking Infrastructure
tl-mr6400 firmwaretp-linkNetworking Infrastructure
TL-MR6400TP-Link Technologies Co Ltd.Networking Infrastructure
tp-link systems inc.commercialCNNetworking Infrastructureaka tp-link
tp-linkcommercialTWNetworking Infrastructureaka tp-link, tp link
tp-link technologies co ltd.commercialCNNetworking Infrastructureaka tl-wr841n, tl-wr940n, tl-wr886n

Exploitability

Official Patch Available
No detection template yetWe can run the check for you — a free external exposure review, no install. Check my exposure

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Execution
View detailed technique mapping

References

https://www.tp-link.com/en/support/download/tl-mr6400/v5.30/#Firmware
tp-link.com
https://www.tp-link.com/us/support/faq/5016/
tp-link.com
https://www.tp-link.com/us/support/faq/5016/
tp-link.com
and 2 more references View all →

Timeline

Published
Mar 12, 2026
Last Updated
Apr 2, 2026

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