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CVE-2021-23009

HIGHCVSS 7.5/10EPSS 0.99%

Last modified

CVE-2021-23009 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. On BIG-IP version 16.0.x before 16.0.1.1 and 15.1.x before 15.1.3, malformed HTTP/2 requests may cause an infinite loop which causes a Denial of Service for Data Plane traffic. TMM takes the configured HA action when the TMM process is aborted. EPSS estimates a 0.99% chance of exploitation in the next 30 days.

Description

On BIG-IP version 16.0.x before 16.0.1.1 and 15.1.x before 15.1.3, malformed HTTP/2 requests may cause an infinite loop which causes a Denial of Service for Data Plane traffic. TMM takes the configured HA action when the TMM process is aborted. There is no control plane exposure, this is a data plane issue only. Note: Software versions which have reached End of Technical Support (EoTS) 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
0.99%

58.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
F5Big-Ip Access Policy Manager>= 15.1.0, < 15.1.3
F5Big-Ip Access Policy Manager>= 16.0.0, < 16.0.1.1
F5Big-Ip Advanced Firewall Manager>= 15.1.0, < 15.1.3
F5Big-Ip Advanced Firewall Manager>= 16.0.0, < 16.0.1.1
F5Big-Ip Advanced Web Application Firewall>= 15.1.0, < 15.1.3
F5Big-Ip Advanced Web Application Firewall>= 16.0.0, < 16.0.1.1
F5Big-Ip Analytics>= 15.1.0, < 15.1.3
F5Big-Ip Analytics>= 16.0.0, < 16.0.1.1
F5Big-Ip Application Acceleration Manager>= 15.1.0, < 15.1.3
F5Big-Ip Application Acceleration Manager>= 16.0.0, < 16.0.1.1
F5Big-Ip Application Security Manager>= 15.1.0, < 15.1.3
F5Big-Ip Application Security Manager>= 16.0.0, < 16.0.1.1
F5Big-Ip Ddos Hybrid Defender>= 15.1.0, < 15.1.3
F5Big-Ip Ddos Hybrid Defender>= 16.0.0, < 16.0.1.1
F5Big-Ip Domain Name System>= 15.1.0, < 15.1.3
F5Big-Ip Domain Name System>= 16.0.0, < 16.0.1.1
F5Big-Ip Fraud Protection Service>= 15.1.0, < 15.1.3
F5Big-Ip Fraud Protection Service>= 16.0.0, < 16.0.1.1
F5Big-Ip Global Traffic Manager>= 15.1.0, < 15.1.3
F5Big-Ip Global Traffic Manager>= 16.0.0, < 16.0.1.1
F5Big-Ip Link Controller>= 15.1.0, < 15.1.3
F5Big-Ip Link Controller>= 16.0.0, < 16.0.1.1
F5Big-Ip Local Traffic Manager>= 15.1.0, < 15.1.3
F5Big-Ip Local Traffic Manager>= 16.0.0, < 16.0.1.1
F5Big-Ip Policy Enforcement Manager>= 15.1.0, < 15.1.3
F5Big-Ip Policy Enforcement Manager>= 16.0.0, < 16.0.1.1
F5Big-Ip Ssl Orchestrator>= 15.1.0, < 15.1.3
F5Big-Ip Ssl Orchestrator>= 16.0.0, < 16.0.1.1

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2021-23009?
On BIG-IP version 16.0.x before 16.0.1.1 and 15.1.x before 15.1.3, malformed HTTP/2 requests may cause an infinite loop which causes a Denial of Service for Data Plane traffic. TMM takes the configured HA action when the TMM process is aborted. There is no control plane exposure, this is a data plane issue only. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
How severe is CVE-2021-23009?
CVE-2021-23009 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.99% probability of exploitation in the next 30 days.
How do I fix CVE-2021-23009?
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