Resource management error in F5 Networks products - CVE-2021-23000

Vulnerability identifier: #VU51490

CSH Severity: Medium

CVSS v4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2021-23000

CWE-ID: CWE-399

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 improper management of internal resources within the application, if the tmm.http.rfc.enforcement with invalid host detection is enabled. A remote attacker can send a specific sequence of malicious requests and perform a denial of service (DoS) attack.

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

Install updates from vendor's website.

BIG-IP AAM - update to 12.1.5.3
BIG-IP GTM - update to 12.1.5.3
BIG-IP Analytics - update to 12.1.5.3
BIG-IP AFM - update to 12.1.5.3
BIG-IP FPS - update to 12.1.5.3
BIG-IP Advanced WAF - update to 12.1.5.3
BIG-IP Link Controller - update to 12.1.5.3
BIG-IP APM - update to 12.1.5.3
BIG-IP PEM - update to 12.1.5.3
BIG-IP ASM - update to 12.1.5.3
BIG-IP LTM - update to 12.1.5.3
BIG-IP DNS - update to 12.1.5.3
BIG-IP DDHD - update to 12.1.5.3
BIG-IP - update to 12.1.5.3
BIG-IP SSLO - update to 12.1.5.3

• https://support.f5.com/csp/article/K34441555

• Denial of service in BIG-IP TMM