#VU52749 Infinite loop in F5 Networks products - CVE-2021-23009

Vulnerability identifier: #VU52749

Vulnerability risk: Medium

CVSSv4.0: 6.6 [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: 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 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.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

BIG-IP: 15.1.0 - 15.1.2.1, 16.0.0 - 16.0.1

BIG-IP LTM: 15.1.0 - 16.0.1

BIG-IP AAM: 15.1.0 - 16.0.1

BIG-IP Advanced WAF: 15.1.0 - 16.0.1

BIG-IP AFM: 15.1.0 - 16.0.1

BIG-IP Analytics: 15.1.0 - 16.0.1

BIG-IP APM: 15.1.0 - 16.0.1

BIG-IP ASM: 15.1.0 - 16.0.1

BIG-IP DDHD: 15.1.0 - 16.0.1

BIG-IP DNS: 15.1.0 - 16.0.1

BIG-IP FPS: 15.1.0 - 16.0.1

BIG-IP GTM: 15.1.0 - 16.0.1

BIG-IP Link Controller: 15.1.0 - 16.0.1

BIG-IP PEM: 15.1.0 - 16.0.1

BIG-IP SSLO: 15.1.0 - 16.0.1

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External links
https://support.f5.com/csp/article/K90603426

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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.