Denial of srevice in HTTP/2 implementation in F5 BIG-IP

Published: 2021-03-11

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Resource management error

EUVDB-ID: #VU51394

Risk: Medium


CVE-ID: CVE-2021-22999

CWE-ID: CWE-399 - Resource Management Errors

Exploit availability: No


The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to improper management of internal resources within the HTTP/2 Profile feature when processing aborted connections for HTTP/2 requests. A remote attacker can send multiple HTTP/2 requests and permanently close connections, which leads to a denial of service (DoS) condition, as the BIG-IP system indefinitely retains such streams unclosed.


Install updates from vendor's website.

Vulnerable software versions

BIG-IP: 14.1.0 -

BIG-IP LTM: 14.1.0 -

BIG-IP AAM: 14.1.0 -

BIG-IP AFM: 14.1.0 -

BIG-IP Analytics: 14.1.0 -

BIG-IP APM: 14.1.0 -

BIG-IP ASM: 14.1.0 -

BIG-IP DNS: 14.1.0 -

BIG-IP FPS: 14.1.0 -

BIG-IP GTM: 14.1.0 -

BIG-IP Link Controller: 14.1.0 -

BIG-IP PEM: 14.1.0 -

CPE2.3 External links

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?