VulnerabilityAnalyzed

CVE-2026-3841

A command injection vulnerability has been identified in the Telnet command-line interface (CLI) of TP-Link TL-MR6400 v5.3.

HIGH 8.5EPSS 1.77%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (1.77%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

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: 8.5 HIGHCVSS: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/M
EPSS: 1.77% probability · 77th percentile
CISA KEV: Not listed
Weakness: CWE-78
Affected: tp-link/tl-mr6400 firmware
Source: f23511db-6c3e-4e32-a477-6aa17d310630

References

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

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.