Vulnerability Description
On all versions of BIG-IP 12.1.x and 11.6.x, the original TLS protocol includes a weakness in the master secret negotiation that is mitigated by the Extended Master Secret (EMS) extension defined in RFC 7627. TLS connections that do not use EMS are vulnerable to man-in-the-middle attacks during renegotiation. Note: Software versions which have reached End of Software Development (EoSD) are not evaluated.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| F5 | Big-Ip Access Policy Manager | >= 11.6.1, <= 11.6.5 |
| F5 | Big-Ip Advanced Firewall Manager | >= 11.6.1, <= 11.6.5 |
| F5 | Big-Ip Advanced Web Application Firewall | >= 11.6.1, <= 11.6.5 |
| F5 | Big-Ip Analytics | >= 11.6.1, <= 11.6.5 |
| F5 | Big-Ip Application Acceleration Manager | >= 11.6.1, <= 11.6.5 |
| F5 | Big-Ip Application Security Manager | >= 11.6.1, <= 11.6.5 |
| F5 | Big-Ip Ddos Hybrid Defender | >= 11.6.1, <= 11.6.5 |
| F5 | Big-Ip Domain Name System | >= 11.6.1, <= 11.6.5 |
| F5 | Big-Ip Fraud Protection Service | >= 11.6.1, <= 11.6.5 |
| F5 | Big-Ip Global Traffic Manager | >= 11.6.1, <= 11.6.5 |
| F5 | Big-Ip Link Controller | >= 11.6.1, <= 11.6.5 |
| F5 | Big-Ip Local Traffic Manager | >= 11.6.1, <= 11.6.5 |
| F5 | Big-Ip Policy Enforcement Manager | >= 11.6.1, <= 11.6.5 |
| F5 | Big-Ip Ssl Orchestrator | >= 11.6.1, <= 11.6.5 |
References
- https://support.f5.com/csp/article/K09121542Vendor Advisory
- https://support.f5.com/csp/article/K09121542Vendor Advisory
FAQ
What is CVE-2021-22981?
CVE-2021-22981 is a vulnerability with a CVSS score of 4.8 (MEDIUM). On all versions of BIG-IP 12.1.x and 11.6.x, the original TLS protocol includes a weakness in the master secret negotiation that is mitigated by the Extended Master Secret (EMS) extension defined in R...
How severe is CVE-2021-22981?
CVE-2021-22981 has been rated MEDIUM with a CVSS base score of 4.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-22981?
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.