PT-2026-25022 · Tp Link · Tp-Link Tl-Mr6400

Mrbruh · Published 2026-03-12 · Updated 2026-05-02 · CVE-2026-3841

Positive Technologies (AI Summary)

CVSS v2.0

9.0

High

Base vector

AV:N/AC:L/Au:S/C:C/I:C/A:C

Name of the Vulnerable Software and Affected Versions TP-Link TL-MR6400 version 5.3

Description A command injection issue exists in the Telnet command-line interface (CLI) of the device. This is due to inadequate data sanitization during certain CLI operations. An authenticated attacker with elevated privileges could potentially execute arbitrary system commands. Successful exploitation could result in complete device compromise, potentially leading to loss of confidentiality, integrity, and availability. The vulnerability affects the processing of data within the CLI.

Recommendations Update to a newer version that contains a fix for this vulnerability. As a temporary workaround, restrict access to the Telnet CLI to minimize the risk of exploitation.

Fix

RCE

OS Command Injection

Weakness Enumeration

CWE-78

Related Identifiers

BDU:2026-04458

CVE-2026-3841

Affected Products

Tp-Link Tl-Mr6400

References · 9

• https://tp-link.com/en/support/download/tl-mr6400/v5.30/#Firmware · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-3841 · Security Note
• https://bdu.fstec.ru/vul/2026-04458 · Security Note
• https://tp-link.com/us/support/faq/5016 · Vendor Advisory
• https://twitter.com/SecureChap/status/2050366399852282016 · Twitter Post
• https://twitter.com/CVEnew/status/2032230697398673699 · Twitter Post
• https://t.me/CVEtracker/47279 · Telegram Post
• https://tenable.com/cve/CVE-2026-3841 · Note
• https://twitter.com/solomonneas/status/2044748214956421600 · Twitter Post