CVE-2021-23035 : What You Need to Know

A detailed analysis of the vulnerability identified as CVE-2021-23035 affecting BIG-IP systems.

Understanding CVE-2021-23035

This section provides insights into the nature and impact of the CVE-2021-23035 vulnerability.

What is CVE-2021-23035?

The CVE-2021-23035 vulnerability exists in BIG-IP versions 14.1.x before 14.1.4.4. It triggers a termination of the Traffic Management Microkernel (TMM) under specific circumstances involving chunked responses in the presence of an HTTP profile on a virtual server.

The Impact of CVE-2021-23035

The vulnerability can lead to abrupt terminations of the Traffic Management Microkernel (TMM) on affected systems, potentially causing service disruptions or denial of service.

Technical Details of CVE-2021-23035

In-depth technical information about the CVE-2021-23035 vulnerability.

Vulnerability Description

On BIG-IP 14.1.x before 14.1.4.4, the issue arises due to a specific sequence of packets causing chunked responses to terminate the Traffic Management Microkernel (TMM).

Affected Systems and Versions

The vulnerability impacts BIG-IP versions 14.1.x before 14.1.4.4.

Exploitation Mechanism

An attacker can exploit this vulnerability by sending specially crafted chunked responses to the HTTP profile configured on a virtual server, triggering TMM termination.

Mitigation and Prevention

Preventive measures and actions to mitigate the risks associated with CVE-2021-23035.

Immediate Steps to Take

Upgrade affected systems to BIG-IP version 14.1.4.4 or newer to address the vulnerability and prevent further exploitation.

Long-Term Security Practices

Adopt robust security practices, including regular security audits, to identify and address vulnerabilities in a proactive manner.

Patching and Updates

Stay informed about security patches and updates released by F5 Networks to ensure the timely application of fixes for known vulnerabilities.