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CVE-2021-22999

HIGHCVSS 7.5/10EPSS 0.96%

Last modified

CVE-2021-22999 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. On versions 15.0.x before 15.1.0 and 14.1.x before 14.1.4, the BIG-IP system provides an option to connect HTTP/2 clients to HTTP/1.x servers. When a client is slow to accept responses and it closes a connection prematurely, the BIG-IP system may indefinitely retain some streams unclosed. EPSS estimates a 0.96% chance of exploitation in the next 30 days.

Description

On versions 15.0.x before 15.1.0 and 14.1.x before 14.1.4, the BIG-IP system provides an option to connect HTTP/2 clients to HTTP/1.x servers. When a client is slow to accept responses and it closes a connection prematurely, the BIG-IP system may indefinitely retain some streams unclosed. 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
0.96%

57.0th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

VendorProductVersions
F5Big-Ip Access Policy Manager>= 14.1.0, < 14.1.4
F5Big-Ip Access Policy Manager>= 15.0.0, < 15.1.0
F5Big-Ip Advanced Firewall Manager>= 14.1.0, < 14.1.4
F5Big-Ip Advanced Firewall Manager>= 15.0.0, < 15.1.0
F5Big-Ip Advanced Web Application Firewall>= 14.1.0, < 14.1.4
F5Big-Ip Advanced Web Application Firewall>= 15.0.0, < 15.1.0
F5Big-Ip Analytics>= 14.1.0, < 14.1.4
F5Big-Ip Analytics>= 15.0.0, < 15.1.0
F5Big-Ip Application Acceleration Manager>= 14.1.0, < 14.1.4
F5Big-Ip Application Acceleration Manager>= 15.0.0, < 15.1.0
F5Big-Ip Application Security Manager>= 14.1.0, < 14.1.4
F5Big-Ip Application Security Manager>= 15.0.0, < 15.1.0
F5Big-Ip Ddos Hybrid Defender>= 14.1.0, < 14.1.4
F5Big-Ip Ddos Hybrid Defender>= 15.0.0, < 15.1.0
F5Big-Ip Domain Name System>= 14.1.0, < 14.1.4
F5Big-Ip Domain Name System>= 15.0.0, < 15.1.0
F5Big-Ip Fraud Protection Service>= 14.1.0, < 14.1.4
F5Big-Ip Fraud Protection Service>= 15.0.0, < 15.1.0
F5Big-Ip Global Traffic Manager>= 14.1.0, < 14.1.4
F5Big-Ip Global Traffic Manager>= 15.0.0, < 15.1.0
F5Big-Ip Link Controller>= 14.1.0, < 14.1.4
F5Big-Ip Link Controller>= 15.0.0, < 15.1.0
F5Big-Ip Local Traffic Manager>= 14.1.0, < 14.1.4
F5Big-Ip Local Traffic Manager>= 15.0.0, < 15.1.0
F5Big-Ip Policy Enforcement Manager>= 14.1.0, < 14.1.4
F5Big-Ip Policy Enforcement Manager>= 15.0.0, < 15.1.0
F5Ssl Orchestrator>= 14.1.0, < 14.1.4
F5Ssl Orchestrator>= 15.0.0, < 15.1.0

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2021-22999?
On versions 15.0.x before 15.1.0 and 14.1.x before 14.1.4, the BIG-IP system provides an option to connect HTTP/2 clients to HTTP/1.x servers. When a client is slow to accept responses and it closes a connection prematurely, the BIG-IP system may indefinitely retain some streams unclosed. Note: Software versions which have reached End of Software Development (EoSD) are not evaluated.
How severe is CVE-2021-22999?
CVE-2021-22999 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.96% probability of exploitation in the next 30 days.
How do I fix CVE-2021-22999?
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