Security Advisory on Authenticated Command Injection Vulnerability on TP-Link TL-WR802N, TL-WR841N and TL-WR840N (CVE-2026-3227)

Vulnerability and Impact Description:

CVE-2026-3227:

A command injection vulnerability was identified due to improper neutralization of special elements used in an OS command. In the router configuration import function allows an authenticated attacker to upload a crafted configuration file that results in execution of OS commands with root privileges during port-trigger processing.

Successful exploitation allows an authenticated attacker to execute system commands with root privileges, leading to full device compromise.

CVSS v4.0 Score: 8.5 / High

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

Affected Products/Versions and Fixes:

Recommendations:

We strongly recommend that users with affected devices take the following actions:

1. Download and update to the latest firmware version to fix the vulnerabilities.

EN: Download for TL-WR802N | TP-Link

Download for TL-WR841N | TP-Lin

Download for TL-WR840N | TP-Link

US: Download for TL-WR802N | TP-Link

Download for TL-WR841N | TP-Link

Note: TL-WR840N is not sold in the US.

Disclaimer:

If you do not take all recommended actions, this vulnerability will remain. TP-Link cannot bear any responsibility for consequences that could have been avoided by following this advisory.