ACTIVELY EXPLOITED
CVE-2021-22991: F5 BIG-IP Traffic Management Microkernel Buffer Overflow
| Vendor | F5 |
|---|---|
| Product | BIG-IP Traffic Management Microkernel |
| Actively exploited | Yes |
| Added to CISA KEV | 18 Jan 2022 |
| CISA federal deadline | 1 Feb 2022 |
| Weakness (CWE) | CWE-119 |
Required action (CISA's text)
Apply updates per vendor instructions.
Description (NVD)
The Traffic Management Microkernel of BIG-IP ASM Risk Engine has a buffer overflow vulnerability, leading to a bypassing of URL-based access controls.
SOURCES
Other F5 flaws
- CVE-2026-94127: F5 BIG-IP APM Heap-based Buffer Overflow Vulnerability
- CVE-2025-53521: F5 BIG-IP Stack-Based Buffer Overflow Vulnerability
- CVE-2023-46748: F5 BIG-IP Configuration Utility SQL Injection Vulnerability
- CVE-2023-46747: F5 BIG-IP Configuration Utility Authentication Bypass Vulnerability
- CVE-2022-1388: F5 BIG-IP Missing Authentication Vulnerability
Data from NVD, CISA KEV, FIRST EPSS and vendor advisories. Updated 10 Nov 2026.