CVE-2021-44827 : Vulnerability Insights and Analysis

TP-Link Archer C20i devices are vulnerable to remote authenticated OS command injection, enabling attackers to execute arbitrary commands with root privileges.

Understanding CVE-2021-44827

What is CVE-2021-44827?

CVE-2021-44827 discloses a critical vulnerability in TP-Link Archer C20i routers that allows remote attackers to run unauthorized commands through the X_TP_ExternalIPv6Address HTTP parameter.

The Impact of CVE-2021-44827

This vulnerability enables a remote authenticated attacker to execute malicious commands on the router with elevated root privileges, potentially compromising the entire network.

Technical Details of CVE-2021-44827

Vulnerability Description

The flaw resides in TP-Link Archer C20i 0.9.1 3.2 v003a.0 Build 170221 Rel.55462n devices, facilitating OS command injection via the X_TP_ExternalIPv6Address parameter.

Affected Systems and Versions

Vendor: TP-Link
Product: Archer C20i
Version: 0.9.1 3.2 v003a.0 Build 170221 Rel.55462n

Exploitation Mechanism

The vulnerability occurs due to improper validation of user-supplied data, allowing attackers to inject and execute arbitrary commands.

Mitigation and Prevention

Immediate Steps to Take

Disable remote management protocols if not necessary
Implement strong and unique passwords for device access
Regularly monitor network traffic for suspicious activities

Long-Term Security Practices

Keep router firmware up to date with the latest security patches
Conduct regular security audits and penetration testing

Patching and Updates

Ensure that the router firmware is promptly updated with security patches provided by TP-Link.