CVE-2021-22991On BIG-IP versions 16.0.x before 16.0.1.1, 15.1.x before 15.1.2.1, 14.1.x before 14.1.4, 13.1.x before 13.1.3.6, and 12.1.x before 12.1.5.3, undisclosed requests to a virtual server may be incorrectl…
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It affects f5 big-ip_access_policy_manager and 13 other products. Add what you run to find out whether that includes you.
CISA lists it as known exploited since Jan 18, 2022; federal agencies had to remediate by Feb 1, 2022. Treat that date as your deadline.
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On BIG-IP versions 16.0.x before 16.0.1.1, 15.1.x before 15.1.2.1, 14.1.x before 14.1.4, 13.1.x before 13.1.3.6, and 12.1.x before 12.1.5.3, undisclosed requests to a virtual server may be incorrectly handled by the Traffic Management Microkernel (TMM) URI normalization, which may trigger a buffer overflow, resulting in a DoS attack. In certain situations, it may theoretically allow bypass of URL based access control or remote code execution (RCE). Note: Software versions which have reached End of Software Development (EoSD) are not evaluated.
- CVSS
- 9.8 CRITICAL (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-119
- Known exploited
- Added to CISA KEV Jan 18, 2022; federal remediation due Feb 1, 2022Apply updates per vendor instructions.
- EPSS (exploitation in the next 30 days)
- 61.06% (percentile 99)
- Assigned by
- f5
- NVD analysis
- Analyzed
- Record last updated
- Oct 21, 2025
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
f5 big-ip_access_policy_manager 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 | NVD |
f5 big-ip_advanced_firewall_manager 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 | NVD |
f5 big-ip_advanced_web_application_firewall 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 | NVD |
f5 big-ip_analytics 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 | NVD |
f5 big-ip_application_acceleration_manager 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 | NVD |
f5 big-ip_application_security_manager 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 |
f5 big-ip_ddos_hybrid_defender f5:big-ip_ddos_hybrid_defender | 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 |
f5 big-ip_domain_name_system f5:big-ip_domain_name_system | 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 |
f5 big-ip_fraud_protection_service f5:big-ip_fraud_protection_service | 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 |
f5 big-ip_global_traffic_manager f5:big-ip_global_traffic_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 |
f5 big-ip_link_controller f5:big-ip_link_controller | 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 |
f5 big-ip_local_traffic_manager f5:big-ip_local_traffic_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 |
f5 big-ip_policy_enforcement_manager f5:big-ip_policy_enforcement_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 |
f5 ssl_orchestrator f5:ssl_orchestrator | 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 |
References
- https://support.f5.com/csp/article/K56715231x-refsource-misc, vendor-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-22991us-government-resource
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.