Vulnerability Description
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 Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| F5 | Big-Ip Access Policy Manager | >= 12.1.0, < 12.1.5.3 |
| F5 | Big-Ip Advanced Firewall Manager | >= 12.1.0, < 12.1.5.3 |
| F5 | Big-Ip Advanced Web Application Firewall | >= 12.1.0, < 12.1.5.3 |
| F5 | Big-Ip Analytics | >= 12.1.0, < 12.1.5.3 |
| F5 | Big-Ip Application Acceleration Manager | >= 12.1.0, < 12.1.5.3 |
| F5 | Big-Ip Application Security Manager | >= 12.1.0, < 12.1.5.3 |
| F5 | Big-Ip Ddos Hybrid Defender | >= 12.1.0, < 12.1.5.3 |
| F5 | Big-Ip Domain Name System | >= 12.1.0, < 12.1.5.3 |
| F5 | Big-Ip Fraud Protection Service | >= 12.1.0, < 12.1.5.3 |
| F5 | Big-Ip Global Traffic Manager | >= 12.1.0, < 12.1.5.3 |
| F5 | Big-Ip Link Controller | >= 12.1.0, < 12.1.5.3 |
| F5 | Big-Ip Local Traffic Manager | >= 12.1.0, < 12.1.5.3 |
| F5 | Big-Ip Policy Enforcement Manager | >= 12.1.0, < 12.1.5.3 |
| F5 | Ssl Orchestrator | >= 12.1.0, < 12.1.5.3 |
Related Weaknesses (CWE)
References
- https://support.f5.com/csp/article/K56715231Vendor Advisory
- https://support.f5.com/csp/article/K56715231Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-US Government Resource
FAQ
What is CVE-2021-22991?
CVE-2021-22991 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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...
How severe is CVE-2021-22991?
CVE-2021-22991 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2021-22991?
Check the references section above for vendor advisories and patch information. Affected products include: F5 Big-Ip Access Policy Manager, F5 Big-Ip Advanced Firewall Manager, F5 Big-Ip Advanced Web Application Firewall, F5 Big-Ip Analytics, F5 Big-Ip Application Acceleration Manager.