How to check if you are exposed to CVE-2021-22991
- Find every F5 BIG-IP Traffic Management Microkernel system you or your clients run, including ones exposed to the internet. Those come first: CISA only lists flaws attackers are already using.
- Compare each version with the fixed versions in the vendor advisory. Where no fix exists yet, apply the vendor’s mitigation or take the system off the internet.
- Run a credentialed vulnerability scan to catch the systems you missed, then check that the next scan no longer reports CVE-2021-22991.
US federal agencies had to fix this by 2022-02-01. Everyone else should treat that deadline as a guide: if it has passed, this is overdue.
Affected versions
Versions the National Vulnerability Database lists as vulnerable to CVE-2021-22991. Check the vendor advisory for the exact fixed builds before you sign anything off.
| Product | Vulnerable versions |
|---|---|
| F5 Big-Ip Access Policy Manager | from 12.1.0 before 12.1.5.3; from 13.1.0 before 13.1.3.6; from 14.1.0 before 14.1.4; from 15.1.0 before 15.1.2.1; from 16.0.0 before 16.0.1.1 |
| F5 Big-Ip Advanced Firewall Manager | from 12.1.0 before 12.1.5.3; from 13.1.0 before 13.1.3.6; from 14.1.0 before 14.1.4; from 15.1.0 before 15.1.2.1; from 16.0.0 before 16.0.1.1 |
| F5 Big-Ip Advanced WEB Application Firewall | from 12.1.0 before 12.1.5.3; from 13.1.0 before 13.1.3.6; from 14.1.0 before 14.1.4; from 15.1.0 before 15.1.2.1; from 16.0.0 before 16.0.1.1 |
| F5 Big-Ip Analytics | from 12.1.0 before 12.1.5.3; from 13.1.0 before 13.1.3.6; from 14.1.0 before 14.1.4; from 15.1.0 before 15.1.2.1; from 16.0.0 before 16.0.1.1 |
| F5 Big-Ip Application Acceleration Manager | from 12.1.0 before 12.1.5.3; from 13.1.0 before 13.1.3.6; from 14.1.0 before 14.1.4; from 15.1.0 before 15.1.2.1; from 16.0.0 before 16.0.1.1 |
| F5 Big-Ip Application Security Manager | from 12.1.0 before 12.1.5.3; from 13.1.0 before 13.1.3.6; from 14.1.0 before 14.1.4; from 15.1.0 before 15.1.2.1; from 16.0.0 before 16.0.1.1 |
NVD lists 8 more affected products; see the full record on NVD.
Timeline
- · Published in the National Vulnerability Database
- · Added to CISA's Known Exploited Vulnerabilities catalog, 293 days after it was published
- · Fix-by date for US federal agencies, passed 1,734 days ago
Weakness type
More exploited F5 vulnerabilities
CISA lists 8 exploited F5 vulnerabilities. The closest matches:
- CVE-2026-94127F5 BIG-IP APM Heap-based Buffer Overflow VulnerabilityAdded 2026-09-22
- CVE-2025-53521F5 BIG-IP Stack-Based Buffer Overflow VulnerabilityAdded 2026-03-27
- CVE-2023-46748F5 BIG-IP Configuration Utility SQL Injection VulnerabilityAdded 2023-10-31
- CVE-2023-46747F5 BIG-IP Configuration Utility Authentication Bypass VulnerabilityAdded 2023-10-31
- CVE-2022-1388F5 BIG-IP Missing Authentication VulnerabilityAdded 2022-05-10
- CVE-2021-22986F5 BIG-IP and BIG-IQ Centralized Management iControl REST Remote Code Execution VulnerabilityAdded 2021-11-03
- CVE-2020-5902F5 BIG-IP Traffic Management User Interface (TMUI) Remote Code Execution VulnerabilityAdded 2021-11-03
Keep going
Sources: CISA Known Exploited Vulnerabilities catalog (version 2026.10.30); EPSS data from FIRST.org; CVSS and descriptions from the NIST National Vulnerability Database. Checked 2026-11-01. This product uses the NVD API but is not endorsed or certified by the NVD.