CVE-2021-22999: High severity F5 BIG-IP Access Policy Manager vulnerability
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.
Affected Software
Event History
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.