CVE-2021-41436 Explained : Impact and Mitigation

An HTTP request smuggling vulnerability in web applications in various ASUS routers allows a remote attacker to perform a denial of service attack.

Understanding CVE-2021-41436

This Common Vulnerabilities and Exposures (CVE) entry describes a critical HTTP request smuggling vulnerability affecting ASUS routers.

What is CVE-2021-41436?

CVE-2021-41436 is an HTTP request smuggling vulnerability found in web applications of ASUS routers like RT-AX3000, RT-AX56U, and others, enabling a remote attacker to execute a denial of service attack.

The Impact of CVE-2021-41436

The vulnerability permits a remote unauthenticated attacker to trigger a denial of service (DoS) by sending a specifically crafted HTTP packet.

Technical Details of CVE-2021-41436

This section covers the technical details of the CVE entry.

Vulnerability Description

The vulnerability exists in the web application of ASUS routers, allowing attackers to exploit it by sending malicious HTTP packets.

Affected Systems and Versions

ASUS ROG Rapture GT-AX11000
RT-AX3000
RT-AX55
RT-AX56U and RT-AX56U_V2
RT-AX58U
Many more models

Exploitation Mechanism

Attackers, by sending crafted HTTP packets, can exploit the vulnerability to perform a DoS attack remotely.

Mitigation and Prevention

Learn how to mitigate and prevent this vulnerability.

Immediate Steps to Take

Apply security patches provided by ASUS promptly.
Monitor network traffic for suspicious activities.
Implement network segmentation to limit the attack surface.

Long-Term Security Practices

Keep firmware and software up to date.
Regularly conduct security assessments and audits.

Patching and Updates

Ensure timely installation of firmware updates and security patches from ASUS.