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Vulnerability record · CVE-2026-3841 · published 12 March 2026

CVE-2026-3841: Tp-link tl-mr6400 firmware os command injection vulnerability

Tp Link · Tl Mr6400 Firmware

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.

8.5 CVSS 4.0 High EPSS 2.7% · top 14.4% CWE-78 · OS command injection
8.5CVSS 4.0 base score
2.7%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

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.

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://www.tp-link.com/en/support/download/tl-mr6400/v5.30/#Firmware Product
https://www.tp-link.com/us/support/faq/5016/ Vendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-3841), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.