high
7.5
Advisory Published
Updated

CVE-2021-22999

First published: Wed Mar 31 2021(Updated: )

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.

Credit: f5sirt@f5.com

Affected SoftwareAffected VersionHow to fix
F5 BIG-IP Access Policy Manager>=14.1.0<14.1.4
F5 BIG-IP Access Policy Manager>=15.0.0<15.1.0
F5 BIG-IP Advanced Firewall Manager>=14.1.0<14.1.4
F5 BIG-IP Advanced Firewall Manager>=15.0.0<15.1.0
F5 Big-ip Advanced Web Application Firewall>=14.1.0<14.1.4
F5 Big-ip Advanced Web Application Firewall>=15.0.0<15.1.0
F5 BIG-IP Analytics>=14.1.0<14.1.4
F5 BIG-IP Analytics>=15.0.0<15.1.0
F5 Big-ip Application Acceleration Manager>=14.1.0<14.1.4
F5 Big-ip Application Acceleration Manager>=15.0.0<15.1.0
F5 BIG-IP Application Security Manager>=14.1.0<14.1.4
F5 BIG-IP Application Security Manager>=15.0.0<15.1.0
F5 Big-ip Ddos Hybrid Defender>=14.1.0<14.1.4
F5 Big-ip Ddos Hybrid Defender>=15.0.0<15.1.0
F5 Big-ip Domain Name System>=14.1.0<14.1.4
F5 Big-ip Domain Name System>=15.0.0<15.1.0
F5 Big-ip Fraud Protection Service>=14.1.0<14.1.4
F5 Big-ip Fraud Protection Service>=15.0.0<15.1.0
F5 Big-ip Global Traffic Manager>=14.1.0<14.1.4
F5 Big-ip Global Traffic Manager>=15.0.0<15.1.0
F5 Big-ip Link Controller>=14.1.0<14.1.4
F5 Big-ip Link Controller>=15.0.0<15.1.0
F5 Big-ip Local Traffic Manager>=14.1.0<14.1.4
F5 Big-ip Local Traffic Manager>=15.0.0<15.1.0
F5 Big-ip Policy Enforcement Manager>=14.1.0<14.1.4
F5 Big-ip Policy Enforcement Manager>=15.0.0<15.1.0
F5 SSL Orchestrator>=14.1.0<14.1.4
F5 SSL Orchestrator>=15.0.0<15.1.0

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Reference Links

Frequently Asked Questions

  • What is CVE-2021-22999?

    CVE-2021-22999 is a vulnerability that affects certain versions of F5 BIG-IP products, allowing an attacker to retain unclosed streams when a slow client prematurely closes a connection.

  • Which F5 products are affected by CVE-2021-22999?

    CVE-2021-22999 affects F5 BIG-IP Access Policy Manager, F5 BIG-IP Advanced Firewall Manager, F5 BIG-IP Advanced Web Application Firewall, and various other F5 products.

  • What is the severity of CVE-2021-22999?

    CVE-2021-22999 has a severity rating of high, with a CVSS score of 7.5.

  • How can an attacker exploit CVE-2021-22999?

    An attacker can exploit CVE-2021-22999 by sending specially crafted requests to a vulnerable F5 BIG-IP system, causing it to retain unclosed streams and potentially leading to resource consumption and denial-of-service conditions.

  • Is there a fix available for CVE-2021-22999?

    Yes, a fix for CVE-2021-22999 is available in versions 14.1.4 and 15.1.0 of the affected F5 products. It is recommended to update to these versions to mitigate the vulnerability.

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