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8.5

TP-Link Routers Allow Malicious File Uploads with Root Access

CVE-2026-3227 · published 7 months ago
Summary

The TP-Link TL-WR802N, TL-WR841N, and TL-WR840N routers are vulnerable to a security risk. An attacker with access to the router can upload a malicious file that allows them to take control of the device with full access. To protect your network, update your router to the latest firmware version or consider replacing the device if an update is not available.

What to do
  • Update tp-link tl-wr802n_firmware to version 260304 or later.
  • Update tp-link tl-wr841n_firmware to version 260303 or later.
  • Update tp-link tl-wr840n_firmware to version 260304 or later.
Affected software
VendorProductAffected versions
tp-link tl-wr802n_firmware < 260304
cpe:2.3:o:tp-link:tl-wr802n_firmware:*:*:*:*:*:*:*:*
tp-link tl-wr841n_firmware < 260303
cpe:2.3:o:tp-link:tl-wr841n_firmware:*:*:*:*:*:*:*:*
tp-link tl-wr840n_firmware < 260304
cpe:2.3:o:tp-link:tl-wr840n_firmware:*:*:*:*:*:*:*:*
Original advisory text
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 co...
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.
References
Fix within
Internet-facing 14 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker full control
Severity
8.5 High
Exploitation
2% chance of attack within 30 days
Type
CWE-78OS Command Injection
Timeline
Published16 Mar 2026
Updated30 Oct 2026
First seen7 Apr 2026
Sources
CVE-2026-3227 · NVD
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