CVE-2022-26517 : Vulnerability Insights and Analysis
Learn about CVE-2022-26517, a medium-severity vulnerability affecting F5 BIG-IP devices. Understand the impact, technical details, and mitigation steps to secure your systems.
This article provides detailed information about CVE-2022-26517, a vulnerability impacting F5 BIG-IP versions prior to 15.1.5.1, 14.1.4.6, and 13.1.5. The vulnerability can result in Traffic Management Microkernel (TMM) termination under specific conditions.
Understanding CVE-2022-26517
CVE-2022-26517 is a medium-severity vulnerability affecting F5 BIG-IP devices, leading to potential service interruptions due to TMM termination.
What is CVE-2022-26517?
The vulnerability exists in F5 BIG-IP versions 15.1.x, 14.1.x, and 13.1.x when the BIG-IP CGNAT Large Scale NAT (LSN) pool is configured alongside packet filtering. Attackers can trigger undisclosed requests, resulting in TMM termination.
The Impact of CVE-2022-26517
The vulnerability poses a high availability impact, potentially disrupting services running on affected F5 BIG-IP devices. The CVSS base score is 5.9, categorizing it as a medium-severity issue.
Technical Details of CVE-2022-26517
Below are the technical details associated with CVE-2022-26517:
Vulnerability Description
F5 BIG-IP versions prior to 15.1.5.1, 14.1.4.6, and 13.1.5 are susceptible to triggering TMM termination through specific undisclosed requests.
Affected Systems and Versions
- Unaffected versions: 12.1.x, 11.6.x, 17.0.0, 16.1.0
- Affected versions: 15.1.x, 14.1.x, 13.1.x
Exploitation Mechanism
Attackers exploit the vulnerability by sending certain requests to the virtual server where the LSN pool is configured, coupled with enabled packet filtering.
Mitigation and Prevention
Given the severity of CVE-2022-26517, it is imperative to take the following mitigative steps:
Immediate Steps to Take
- Update to F5 BIG-IP versions 15.1.5.1, 14.1.4.6, or 13.1.5+ to eliminate the vulnerability.
- Disable the affected configurations until updates can be applied.
Long-Term Security Practices
- Regularly monitor F5 security advisories and apply patches promptly.
- Implement network segmentation to minimize the impact of potential attacks.
Patching and Updates
Stay informed about security updates released by F5 Networks and apply them as soon as possible to ensure the protection of your systems.