Which versions of Tl Wr802n V4 are affected by CVE-2026-3227?

Organizations using TP-Link TL-WR802N face significant risk from CVE-2026-3227, a OS command injection vulnerability rated CVSS 8.5.. A patch is available.

How to fix or mitigate CVE-2026-3227?

Within 7 days: Identify all affected systems running TP-Link TL-WR802N and apply vendor patches promptly. Validate that input sanitization is in place for all user-controlled parameters.

Tl Wr802n V4 CVE-2026-3227

Q: What is the CVSS score of CVE-2026-3227?

CVE-2026-3227 has a CVSS 4.0 base score of 8.5 (High). 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. EPSS exploitation probability: 0.4%.

EUVD-2026-12171 HIGH

OS Command Injection (CWE-78)

2026-03-13 TPLink

TP-Link Command Injection Tl Wr802n V4 Tl Wr841n V14 Tl Wr840n V6

8.5

CVSS 4.0 · Vendor: TPLink

Severity by source

Vendor (TPLink) PRIMARY

8.5 HIGH

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

Primary rating from Vendor (TPLink) · only source for this CVE.

CVSS VectorVendor: TPLink

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

Attack Vector

Adjacent

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Lifecycle Timeline

EUVD ID Assigned

Mar 13, 2026 - 22:01 euvd

EUVD-2026-12171

Analysis Generated

Mar 13, 2026 - 22:01 vuln.today

Patch released

Mar 13, 2026 - 22:01 nvd

Patch available

CVE Published

Mar 13, 2026 - 21:38 nvd

HIGH 8.5

DescriptionCVE.org

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.

AnalysisAI

Authenticated attackers can achieve root-level command execution on TP-Link TL-WR802N v4, TL-WR841N v14, and TL-WR840N v6 routers by uploading a malicious configuration file through the import function, exploiting improper input validation in the port-trigger processing logic. Successful exploitation grants complete control over the affected device, allowing full compromise of the router and any connected network. A patch is available for this high-severity vulnerability.

Technical ContextAI

Command injection allows an attacker to execute arbitrary OS commands on the host system through a vulnerable application that passes user input to system shells. This vulnerability is classified as OS Command Injection (CWE-78).

RemediationAI

A vendor patch is available — apply it immediately. Avoid passing user input to system commands. Use language-specific APIs instead of shell commands. If unavoidable, use strict input validation and escaping.