Command Injection Vulnerability in TP-Link Routers

CVE-2026-3227

What is CVE-2026-3227?

CVE-2026-3227 is a command injection vulnerability found in specific models of TP-Link routers, specifically the TL-WR802N v4, TL-WR841N v14, and TL-WR840N v6. This vulnerability arises from improper handling of certain characters within the router's configuration import function. When an authenticated attacker uploads a specially crafted configuration file, it can lead to the execution of operating system commands with root privileges during the port-trigger processing. As a result, this vulnerability poses a severe risk to organizations that rely on these routers, as it allows an attacker to gain full control over the affected device, potentially compromising the network security and integrity.

Potential impact of CVE-2026-3227

1. Full Device Compromise: Successful exploitation of this vulnerability can enable an attacker to execute arbitrary commands on the router with root privileges, leading to total control over the device. This can facilitate further attacks on the internal network and connected devices.

2. Network Security Breach: With administrative access to the router, an attacker could manipulate network traffic, redirect users to malicious sites, or intercept sensitive data. This can result in significant security breaches and data leakage for organizations utilizing these routers.

3. Persistence of Threats: Once an attacker has compromised a router, they can establish persistence mechanisms, allowing them to maintain control even after potential mitigation attempts. This persistent threat could lead to long-term vulnerabilities in the organization’s overall cybersecurity posture.

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