CVE-2021-41435 : What You Need to Know
Learn about CVE-2021-41435, a critical ASUS router vulnerability allowing remote attackers to bypass CAPTCHA protection and conduct unlimited login attempts. Discover mitigation steps here.
A brute-force protection bypass vulnerability in CAPTCHA protection in multiple ASUS routers allows remote attackers to attempt unlimited login credentials through a specific HTTP request.
Understanding CVE-2021-41435
This CVE involves a security flaw in CAPTCHA protection on various ASUS router models, enabling unauthorized individuals to try numerous login attempts remotely.
What is CVE-2021-41435?
The vulnerability in CAPTCHA protection in ASUS routers permits attackers to conduct multiple login attempts via a particular HTTP request, bypassing brute-force protection.
The Impact of CVE-2021-41435
The exploit enables remote threat actors to perform an unlimited number of login attempts, potentially leading to unauthorized access to the affected routers' configurations and sensitive information.
Technical Details of CVE-2021-41435
This section delves deeper into the technical aspects of the vulnerability.
Vulnerability Description
The flaw allows bypassing of brute-force protection in CAPTCHA, impacting several ASUS router models, such as RT-AX88U and TUF Gaming AX5400.
Affected Systems and Versions
- ASUS ROG Rapture GT-AX11000
- RT-AX56U_V2
- RT-AX82U GUNDAM EDITION
- RT-AX86 Series
- TUF Gaming AX3000
- ASUS ZenWiFi XD6
- ASUS ZenWiFi AX (XT8)
- RT-AX68U
Exploitation Mechanism
Attackers exploit the vulnerability by sending crafted HTTP requests, circumventing CAPTCHA protection to attempt unauthorized login activities.
Mitigation and Prevention
Protect your systems from CVE-2021-41435 with the following strategies.
Immediate Steps to Take
- Disable remote management access to the affected routers.
- Implement strong, unique passwords for router login credentials.
- Monitor network activity for any suspicious login attempts.
- Update router firmware to the latest version provided by ASUS.
Long-Term Security Practices
- Regularly change router login passwords.
- Enable multi-factor authentication where possible.
- Conduct periodic security audits on your network infrastructure.
Patching and Updates
Ensure timely installation of firmware updates released by ASUS to address the CVE-2021-41435 vulnerability.