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Vulnerability DatabaseCVE-2021-22977

CVE-2021-22977: 
F5 BIG-IP Advanced Firewall Manager vulnerability analysis and mitigation

Overview

CVE-2021-22977 affects BIG-IP versions 16.0.0-16.0.1 and 14.1.2.4-14.1.3. The vulnerability involves cooperation between malicious HTTP client code and a malicious server that may cause TMM (Traffic Management Microkernel) to restart and generate a core file (MITRE CVE). The vulnerability was discovered and disclosed in early 2021, with the CVE being created on January 6, 2021.

Technical details

The vulnerability has received a CVSS v3.1 score of 8.3 (HIGH) and CVSS v2.0 score of 5.1 (MEDIUM) (NVD). The vulnerability affects multiple BIG-IP modules including LTM, AAM, Advanced WAF, AFM, Analytics, APM, ASM, DDHD, DNS, FPS, GTM, Link Controller, PEM, and SSLO (CERT-FR).

Impact

When exploited, this vulnerability can cause the Traffic Management Microkernel (TMM) to restart and generate a core file, potentially leading to service disruption (MITRE CVE).

Mitigation and workarounds

The vulnerability has been addressed in versions 14.1.3.1, 15.1.2.1, and 16.0.1.1 with the latest patches. Organizations running affected versions should upgrade to these patched versions (CERT-FR).

Additional resources

Source: This report was generated using AI

Related F5 BIG-IP Advanced Firewall Manager vulnerabilities:

CVE ID

Severity

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Technologies

Component name

CISA KEV exploit

Has fix

Published date

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NoYesAug 13, 2025

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