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HIGH · 7.5

CVE-2021-23000

On BIG-IP versions 13.1.3.4-13.1.3.6 and 12.1.5.2, if the tmm.http.rfc.enforcement BigDB key is enabled in a BIG-IP system, or the Bad host header value is checked in the AFM HTTP security profile ass...

Vulnerability Description

On BIG-IP versions 13.1.3.4-13.1.3.6 and 12.1.5.2, if the tmm.http.rfc.enforcement BigDB key is enabled in a BIG-IP system, or the Bad host header value is checked in the AFM HTTP security profile associated with a virtual server, in rare instances, a specific sequence of malicious requests may cause TMM to restart. Note: Software versions which have reached End of Software Development (EoSD) are not evaluated.

CVSS Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH

Affected Products

VendorProductVersions
F5Big-Ip Access Policy Manager>= 13.1.3.4, < 13.1.3.6
F5Big-Ip Advanced Firewall Manager>= 13.1.3.4, < 13.1.3.6
F5Big-Ip Advanced Web Application Firewall>= 13.1.3.4, < 13.1.3.6
F5Big-Ip Analytics>= 13.1.3.4, < 13.1.3.6
F5Big-Ip Application Acceleration Manager>= 13.1.3.4, < 13.1.3.6
F5Big-Ip Application Security Manager>= 13.1.3.4, < 13.1.3.6
F5Big-Ip Ddos Hybrid Defender>= 13.1.3.4, < 13.1.3.6
F5Big-Ip Domain Name System>= 13.1.3.4, < 13.1.3.6
F5Big-Ip Fraud Protection Service>= 13.1.3.4, < 13.1.3.6
F5Big-Ip Global Traffic Manager>= 13.1.3.4, < 13.1.3.6
F5Big-Ip Link Controller>= 13.1.3.4, < 13.1.3.6
F5Big-Ip Local Traffic Manager>= 13.1.3.4, < 13.1.3.6
F5Big-Ip Policy Enforcement Manager>= 13.1.3.4, < 13.1.3.6
F5Ssl Orchestrator>= 13.1.3.4, < 13.1.3.6

References

FAQ

What is CVE-2021-23000?

CVE-2021-23000 is a vulnerability with a CVSS score of 7.5 (HIGH). On BIG-IP versions 13.1.3.4-13.1.3.6 and 12.1.5.2, if the tmm.http.rfc.enforcement BigDB key is enabled in a BIG-IP system, or the Bad host header value is checked in the AFM HTTP security profile ass...

How severe is CVE-2021-23000?

CVE-2021-23000 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2021-23000?

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.