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

Published: 2021-04-29
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-23010
Exploitation vector Network
Public exploit N/A
Vulnerable software
Hardware solutions / Security hardware applicances

Vendor F5 Networks, Inc.

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Input validation error

EUVDB-ID: #VU52746

Risk: Medium


CVE-ID: CVE-2021-23010

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 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.


Install updates from vendor's website.

Vulnerable software versions

BIG-IP ASM: 12.1.0 - 16.0.1

CPE2.3 External links

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?