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

Vulnerability identifier: #VU52749

CSH Severity: Medium

CVSS v4: 8.7 [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]

CVE-ID: CVE-2021-23009

CWE-ID: CWE-835

Exploitation vector: Remote access

Exploit availability: No public exploit available

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.

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

Install updates from vendor's website.

BIG-IP APM - addressed in versions 15.1.3, 16.0.1.1
BIG-IP GTM - addressed in versions 15.1.3, 16.0.1.1
BIG-IP SSLO - addressed in versions 15.1.3, 16.0.1.1
BIG-IP DNS - addressed in versions 15.1.3, 16.0.1.1
BIG-IP AAM - addressed in versions 15.1.3, 16.0.1.1
BIG-IP DDHD - addressed in versions 15.1.3, 16.0.1.1
BIG-IP Advanced WAF - addressed in versions 15.1.3, 16.0.1.1
BIG-IP LTM - addressed in versions 15.1.3, 16.0.1.1
BIG-IP Analytics - addressed in versions 15.1.3, 16.0.1.1
BIG-IP FPS - addressed in versions 15.1.3, 16.0.1.1
BIG-IP PEM - addressed in versions 15.1.3, 16.0.1.1
BIG-IP AFM - addressed in versions 15.1.3, 16.0.1.1
BIG-IP Link Controller - addressed in versions 15.1.3, 16.0.1.1
BIG-IP ASM - addressed in versions 15.1.3, 16.0.1.1
BIG-IP - addressed in versions 15.1.3, 16.0.1.1

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

• Denial of service in BIG-IP TMM