CVE-2026-3227

Analyzed Analyzed - Analysis Complete

Command Injection in TP-Link Routers Allows Root Execution

Publication date: 2026-03-16

Last updated on: 2026-07-01

Assigner: TPLink

Description

A command injection vulnerability was identified in TP-Link TL-WR802N v4, TL-WR841N v14, and TL-WR840N v6 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 Scores

EPSS Scores

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Meta Information

Published

2026-03-16

Last Modified

2026-07-01

Generated

2026-07-06

AI Q&A

2026-03-16

EPSS Evaluated

2026-07-05

NVD

CVE-2026-3227

EUVD

EUVD-2026-12171

Affected Vendors & Products

Vendor	Product	Version / Range
tp-link	tl-wr802n_firmware	to 260304 (exc)
tp-link	tl-wr841n_firmware	to 260303 (exc)
tp-link	tl-wr840n_firmware	to 260304 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-78	The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.

Attack-Flow Graph

Executive Summary

[{'type': 'paragraph', 'content': "CVE-2026-3227 is a command injection vulnerability found in certain TP-Link router models: TL-WR802N v4, TL-WR841N v14, and TL-WR840N v6. The issue arises because the router's configuration import function does not properly neutralize special characters used in operating system commands."}, {'type': 'paragraph', 'content': 'An authenticated attacker can exploit this by uploading a specially crafted configuration file. This triggers the execution of arbitrary OS commands with root privileges during the port-trigger processing phase.'}, {'type': 'paragraph', 'content': 'Successful exploitation results in full device compromise, allowing the attacker to execute system commands with the highest level of access.'}] [2]

Impact Analysis

This vulnerability allows an authenticated attacker to execute arbitrary system commands with root privileges on affected TP-Link routers.

The impact includes full compromise of the device, meaning the attacker can control the router completely, potentially intercepting or manipulating network traffic, disrupting network services, or using the device as a foothold for further attacks.

Because the attacker gains root-level access, the security, integrity, and availability of the device and connected network can be severely affected.

Compliance Impact

I don't know

Detection Guidance

I don't know

Mitigation Strategies

To mitigate this vulnerability, TP-Link strongly recommends updating affected devices to the latest firmware versions.

The affected models and their firmware versions to update to are:

TL-WR802N (v4) to firmware version V4_260304 or later
TL-WR841N (v14) to firmware version V14_260303 or later
TL-WR840N (v6) to firmware version V6_260304 or later

Failure to apply these updates leaves devices vulnerable to root-level command execution and full compromise.

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