Vulnerability identifier: #VU51490

Vulnerability risk: Medium

CVSSv3.1: 5.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-23000

CWE-ID: CWE-399

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
BIG-IP
Hardware solutions / Firmware
BIG-IP DDHD
Hardware solutions / Firmware
BIG-IP SSLO
Hardware solutions / Firmware
BIG-IP LTM
Hardware solutions / Security hardware applicances
BIG-IP AFM
Hardware solutions / Security hardware applicances
BIG-IP Analytics
Hardware solutions / Security hardware applicances
BIG-IP APM
Hardware solutions / Security hardware applicances
BIG-IP ASM
Hardware solutions / Security hardware applicances
BIG-IP FPS
Hardware solutions / Security hardware applicances
BIG-IP GTM
Hardware solutions / Security hardware applicances
BIG-IP PEM
Hardware solutions / Security hardware applicances
BIG-IP AAM
Hardware solutions / Routers & switches, VoIP, GSM, etc
BIG-IP DNS
Hardware solutions / Routers & switches, VoIP, GSM, etc
BIG-IP Link Controller
Hardware solutions / Routers & switches, VoIP, GSM, etc
BIG-IP Advanced WAF
Client/Desktop applications / Antivirus software/Personal firewalls

Vendor: F5 Networks

Description

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.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

BIG-IP: 13.1.3.4 - 13.1.3.6, 12.1.5.2

BIG-IP LTM: 12.1.5.2 - 13.1.3.6

BIG-IP AAM: 12.1.5.2 - 13.1.3.6

BIG-IP Advanced WAF: 12.1.5.2 - 13.1.3.6

BIG-IP AFM: 12.1.5.2 - 13.1.3.6

BIG-IP Analytics: 12.1.5.2 - 13.1.3.6

BIG-IP APM: 12.1.5.2 - 13.1.3.6

BIG-IP ASM: 12.1.5.2 - 13.1.3.6

BIG-IP DDHD: 12.1.5.2 - 13.1.3.6

BIG-IP DNS: 12.1.5.2 - 13.1.3.6

BIG-IP FPS: 12.1.5.2 - 13.1.3.6

BIG-IP GTM: 12.1.5.2 - 13.1.3.6

BIG-IP Link Controller: 12.1.5.2 - 13.1.3.6

BIG-IP PEM: 12.1.5.2 - 13.1.3.6

BIG-IP SSLO: 12.1.5.2 - 13.1.3.6

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External links
http://support.f5.com/csp/article/K34441555

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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