Denial of service in F5 BIG-IP products

Published: 2021-08-25

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Input validation error

EUVDB-ID: #VU56088

Risk: Low

CVSSv3.1: 4.6 [CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-23045

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No


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

The vulnerability exists due to insufficient validation of user-supplied input in the Traffic Management Microkernel (TMM). A remote attacker on the local network can pass specially crafted input to the application and perform a denial of service (DoS) attack.


Install updates from vendor's website.

Vulnerable software versions

BIG-IP: 12.1.0 - 16.1.0

BIG-IP LTM: 12.1.0 -

BIG-IP AAM: 12.1.0 -

BIG-IP Advanced WAF: 12.1.0 -

BIG-IP AFM: 12.1.0 -

BIG-IP Analytics: 12.1.0 -

BIG-IP APM: 12.1.0 -

BIG-IP ASM: 12.1.0 -

BIG-IP DDHD: 12.1.0 -

BIG-IP DNS: 12.1.0 -

BIG-IP FPS: 12.1.0 -

BIG-IP GTM: 12.1.0 -

BIG-IP Link Controller: 12.1.0 -

BIG-IP PEM: 12.1.0 -

BIG-IP SSLO: 12.1.0 -

External links

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.