CVE-2026-3227
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Command Injection in TP-Link Routers Allows Root Execution

Publication date: 2026-03-16

Last updated on: 2026-04-07

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.
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Meta Information
Published
2026-03-16
Last Modified
2026-04-07
Generated
2026-06-16
AI Q&A
2026-03-16
EPSS Evaluated
2026-06-15
NVD
CVE-2026-3227
EUVD
EUVD-2026-12171
Affected Vendors & Products
Showing 3 associated CPEs
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
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KEV
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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.
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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

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Detection Guidance

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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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