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CVE-2026-3227 TP-Link CVE debrief

CVE-2026-3227 is a high-severity command injection vulnerability affecting TP-Link TL-WR802N v4, TL-WR841N v14, and TL-WR840N v6 routers. The vulnerability allows an authenticated attacker to upload a crafted configuration file, leading to the execution of OS commands with root privileges during port-trigger processing. Successful exploitation enables an attacker to execute system commands with root privileges, resulting in full device compromise. The vulnerability has a CVSS score of 8.5 and is considered HIGH severity. The CVE was published on March 16, 2026, and last modified on July 1, 2026.

Vendor
TP-Link
Product
TL-WR802N v4, TL-WR841N v14, TL-WR840N v6
CVSS
HIGH 8.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-03-16
Original CVE updated
2026-07-01
Advisory published
2026-03-16
Advisory updated
2026-07-01

Who should care

Administrators and users of TP-Link TL-WR802N v4, TL-WR841N v14, and TL-WR840N v6 routers should be aware of this vulnerability and take immediate action to mitigate the risk. This vulnerability can be exploited by an authenticated attacker, which makes it particularly concerning for organizations that have these devices in their network. Security teams should prioritize patching or updating affected devices to prevent potential attacks.

Technical summary

The command injection vulnerability in TP-Link routers is caused by improper neutralization of special elements used in an OS command. The vulnerability exists in the router configuration import function, which allows an authenticated attacker to upload a crafted configuration file. This file can be designed to execute OS commands with root privileges during port-trigger processing. The vulnerability has been assigned a CVSS score of 8.5, indicating high severity. The affected devices are TL-WR802N v4, TL-WR841N v14, and TL-WR840N v6.

Defensive priority

High priority should be given to patching or updating affected TP-Link devices. Security teams should ensure that all TL-WR802N v4, TL-WR841N v14, and TL-WR840N v6 routers are updated with the latest firmware to prevent exploitation of this vulnerability.

Recommended defensive actions

  • Update TL-WR802N v4 to the latest firmware version.
  • Update TL-WR841N v14 to the latest firmware version.
  • Update TL-WR840N v6 to the latest firmware version.
  • Restrict access to the router configuration import function.
  • Monitor network activity for suspicious commands.

Evidence notes

The CVE-2026-3227 vulnerability was identified in TP-Link routers and has been documented in the official CVE record and NVD detail pages. The vulnerability allows an authenticated attacker to execute system commands with root privileges, leading to full device compromise. The affected devices and CVSS score have been confirmed through official sources.

Official resources

This article was generated with AI assistance based on the supplied source corpus.