CVE-2021-22976 Explained : Impact and Mitigation
Learn about CVE-2021-22976 affecting BIG-IP Advanced WAF & ASM versions, leading to potential Denial of Service attacks. Take immediate steps to safeguard systems.
This article provides an overview of CVE-2021-22976, a vulnerability found in BIG-IP Advanced WAF and ASM versions before specified releases, leading to potential Denial of Service (DoS) attacks.
Understanding CVE-2021-22976
This section delves into the specifics of the CVE-2021-22976 vulnerability affecting BIG-IP Advanced WAF and ASM.
What is CVE-2021-22976?
The vulnerability occurs in versions of BIG-IP Advanced WAF and ASM before specific releases. It stems from excessive CPU usage in the system when processing WebSocket requests with JSON payloads.
The Impact of CVE-2021-22976
The vulnerability can be exploited to cause a Denial of Service (DoS) condition on affected systems, potentially disrupting services and availability.
Technical Details of CVE-2021-22976
This section outlines technical aspects of the CVE-2021-22976 vulnerability.
Vulnerability Description
The vulnerability arises from an unusually large number of parameters in WebSocket requests with JSON payloads, leading to heightened CPU consumption in the bd process.
Affected Systems and Versions
BIG-IP Advanced WAF and ASM versions 16.0.x before 16.0.1.1, 15.1.x before 15.1.2, 14.1.x before 14.1.3.1, 13.1.x before 13.1.3.6, and all 12.1.x versions are impacted by this vulnerability.
Exploitation Mechanism
Attackers can exploit the vulnerability by sending WebSocket requests with manipulated JSON payloads containing an excessive number of parameters, causing the CPU usage to spike.
Mitigation and Prevention
This section provides guidance on mitigating the risks associated with CVE-2021-22976.
Immediate Steps to Take
Users are advised to update affected systems to the latest patched versions or apply provided security fixes to prevent exploitation.
Long-Term Security Practices
Implementing network security measures, segmenting networks, and monitoring for abnormal traffic patterns can enhance overall security posture.
Patching and Updates
Regularly updating and patching BIG-IP Advanced WAF and ASM systems can help address known vulnerabilities and protect against potential threats.