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CVE-2021-23000

HIGHCVSS 7.5/10EPSS 0.93%

Last modified

CVE-2021-23000 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. EPSS estimates a 0.93% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability
0.93%

56.2th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

VendorProductVersions
F5Big-Ip Access Policy Manager>= 13.1.3.4, < 13.1.3.6
F5Big-Ip Access Policy Manager12.1.5.2
F5Big-Ip Advanced Firewall Manager>= 13.1.3.4, < 13.1.3.6
F5Big-Ip Advanced Firewall Manager12.1.5.2
F5Big-Ip Advanced Web Application Firewall>= 13.1.3.4, < 13.1.3.6
F5Big-Ip Advanced Web Application Firewall12.1.5.2
F5Big-Ip Analytics>= 13.1.3.4, < 13.1.3.6
F5Big-Ip Analytics12.1.5.2
F5Big-Ip Application Acceleration Manager>= 13.1.3.4, < 13.1.3.6
F5Big-Ip Application Acceleration Manager12.1.5.2
F5Big-Ip Application Security Manager>= 13.1.3.4, < 13.1.3.6
F5Big-Ip Application Security Manager12.1.5.2
F5Big-Ip Ddos Hybrid Defender>= 13.1.3.4, < 13.1.3.6
F5Big-Ip Ddos Hybrid Defender12.1.5.2
F5Big-Ip Domain Name System>= 13.1.3.4, < 13.1.3.6
F5Big-Ip Domain Name System12.1.5.2
F5Big-Ip Fraud Protection Service>= 13.1.3.4, < 13.1.3.6
F5Big-Ip Fraud Protection Service12.1.5.2
F5Big-Ip Global Traffic Manager>= 13.1.3.4, < 13.1.3.6
F5Big-Ip Global Traffic Manager12.1.5.2
F5Big-Ip Link Controller>= 13.1.3.4, < 13.1.3.6
F5Big-Ip Link Controller12.1.5.2
F5Big-Ip Local Traffic Manager>= 13.1.3.4, < 13.1.3.6
F5Big-Ip Local Traffic Manager12.1.5.2
F5Big-Ip Policy Enforcement Manager>= 13.1.3.4, < 13.1.3.6
F5Big-Ip Policy Enforcement Manager12.1.5.2
F5Ssl Orchestrator>= 13.1.3.4, < 13.1.3.6
F5Ssl Orchestrator12.1.5.2

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is 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 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.
How severe is CVE-2021-23000?
CVE-2021-23000 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.93% probability of exploitation in the next 30 days.
How do I fix CVE-2021-23000?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST