Infinite loop in F5 Networks products - CVE-2021-23009

Vulnerability identifier: #VU52749

CSH Severity: Medium

CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green

CVE-ID: CVE-2021-23009

CWE-ID: CWE-835

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerable software:
BIG-IP
BIG-IP DDHD
BIG-IP SSLO
BIG-IP LTM
BIG-IP AFM
BIG-IP Analytics
BIG-IP APM
BIG-IP ASM
BIG-IP FPS
BIG-IP GTM
BIG-IP PEM
BIG-IP AAM
BIG-IP DNS
BIG-IP Link Controller
BIG-IP Advanced WAF

Software vendor:
F5 Networks

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

The vulnerability exists due to infinite loop when processing HTTP/2 requests in TMM module. A remote attacker can send specially crafted HTTP/2 packets to the system and cause a denial of service condition.

Install updates from vendor's website.

• https://support.f5.com/csp/article/K90603426