CVE-2021-23000 : What You Need to Know

F5's BIG-IP software versions 13.1.3.4-13.1.3.6 and 12.1.5.2 are affected by a vulnerability that could lead to TMM restart in specific conditions. Here's what you should know about CVE-2021-23000.

Understanding CVE-2021-23000

This section provides insights into the nature of the CVE-2021-23000 vulnerability.

What is CVE-2021-23000?

The vulnerability occurs in BIG-IP versions 13.1.3.4-13.1.3.6 and 12.1.5.2 due to certain configurations related to 'tmm.http.rfc.enforcement' BigDB key or bad host header value in AFM HTTP security profiles, which can trigger TMM restarts.

The Impact of CVE-2021-23000

The vulnerability, if exploited, can result in Denial of Service (DoS) conditions on affected systems running the specified software versions.

Technical Details of CVE-2021-23000

Delve into the technical specifics of CVE-2021-23000 here.

Vulnerability Description

On affected BIG-IP versions, enabling specific configurations may allow a sequence of malicious requests to cause the Traffic Management Microkernel (TMM) to restart, potentially disrupting services.

Affected Systems and Versions

The vulnerability impacts BIG-IP versions 13.1.3.4-13.1.3.6 and 12.1.5.2 running the mentioned configurations.

Exploitation Mechanism

Malicious actors can exploit this vulnerability by sending a specific sequence of requests to the system, triggering a TMM restart and causing service interruptions.

Mitigation and Prevention

Learn how to mitigate the risks associated with CVE-2021-23000 and prevent potential exploitation.

Immediate Steps to Take

To safeguard systems, consider disabling the problematic configurations or applying vendor-recommended workarounds until official patches are available.

Long-Term Security Practices

Implement robust security measures such as network segmentation, access controls, and regular security assessments to fortify your infrastructure against potential threats.

Patching and Updates

Stay informed about security advisories from F5 and promptly apply patches and updates to address the CVE-2021-23000 vulnerability.