Denial of service when processing WebSocket requests in BIG-IP ASM and Advanced WAF



Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-23010
CWE-ID CWE-20
Exploitation vector Network
Public exploit N/A
Vulnerable software
 BIG-IP ASM
Hardware solutions / Security hardware applicances

Vendor F5 Networks

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Input validation error

EUVDB-ID: #VU52746

Risk: Medium

CVSSv4.0: 4.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-23010

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

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 when processing WebSocket requests with JSON payloads using the default JSON content profile in the ASM security policy. A remote attacker can pass specially crafted input to the system and crash the BIG-IP ASM bd process.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

BIG-IP ASM: 12.1.0 - 16.0.1

CPE2.3 External links

https://support.f5.com/csp/article/K18570111


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.



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