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Vulnerability DatabaseCVE-2021-23034

CVE-2021-23034: 
F5 BIG-IP Advanced Firewall Manager vulnerability analysis and mitigation

Overview

The vulnerability CVE-2021-23034 affects BIG-IP systems version 16.x before 16.1.0 and 15.1.x before 15.1.3.1. The vulnerability occurs when a DNS profile using a DNS cache resolver is configured on a virtual server, where undisclosed requests can cause the Traffic Management Microkernel (TMM) process to terminate (MITRE CVE).

Technical details

The vulnerability has been assigned a CVSS score of 7.5, indicating a high-severity security issue. The vulnerability specifically affects the DNS cache resolver functionality when configured on a virtual server, potentially leading to service disruption through the termination of the Traffic Management Microkernel process (Hacker News).

Impact

When successfully exploited, this vulnerability can cause the Traffic Management Microkernel (TMM) process to terminate, potentially leading to service disruption and affecting the availability of the BIG-IP system (MITRE CVE).

Mitigation and workarounds

F5 has released patches to address this vulnerability. Users are strongly advised to update their BIG-IP systems to version 16.1.0 or 15.1.3.1 or later, depending on their current version. Given the critical nature of BIG-IP devices in network infrastructure, administrators are recommended to install the updated software as soon as possible (Hacker News).

Additional resources

Source: This report was generated using AI

Related F5 BIG-IP Advanced Firewall Manager vulnerabilities:

CVE ID

Severity

Score

Technologies

Component name

CISA KEV exploit

Has fix

Published date

CVE-2025-41433HIGH8.7
  • F5 BIG-IP Advanced Firewall ManagerF5 BIG-IP Advanced Firewall Manager
  • cpe:2.3:a:f5:big-ip_access_policy_manager
NoYesMay 07, 2025
CVE-2025-41431HIGH8.7
  • F5 BIG-IP Advanced Firewall ManagerF5 BIG-IP Advanced Firewall Manager
  • cpe:2.3:a:f5:big-ip_local_traffic_manager
NoYesMay 07, 2025
CVE-2025-41414HIGH8.7
  • F5 BIG-IP Advanced Firewall ManagerF5 BIG-IP Advanced Firewall Manager
  • cpe:2.3:a:f5:big-ip_access_policy_manager
NoYesMay 07, 2025
CVE-2025-41399HIGH8.7
  • F5 BIG-IP Advanced Firewall ManagerF5 BIG-IP Advanced Firewall Manager
  • cpe:2.3:a:f5:big-ip_application_security_manager
NoYesMay 07, 2025
CVE-2025-54500MEDIUM6.9
  • F5 BIG-IP Advanced Firewall ManagerF5 BIG-IP Advanced Firewall Manager
  • cpe:2.3:a:f5:big-ip_access_policy_manager
NoYesAug 13, 2025

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