Review reviewHigh

CVE-2026-3227

TP-Link Systems Inc. TL-WR802N v4, TL-WR841N v14, TL-WR840N v6

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: 8.5
EPSS: 1.13%
CISA KEV: Not listed
Published: 2026.03.16

PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability1.13%

Technical severityCVSS 8.5

Vulnerability overview

Affected product and versions

Product: TP-Link Systems Inc. TL-WR802N v4, TL-WR841N v14, TL-WR840N v6
Affected versions: < 260304, < 260303
Fixed versions: 260304, 260303

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

1
Identify
Confirm that TP-Link Systems Inc. TL-WR802N v4, TL-WR841N v14, TL-WR840N v6 and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CWE: CWE-78