CVE-2021-23030

Name: CVE-2021-23030
Creator: NVD / NIST
Published: 2021-09-14T21:15:07.723+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.93%

Last modified Jun 17, 2026

CVE-2021-23030 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. On BIG-IP Advanced WAF and BIG-IP ASM version 16.0.x before 16.0.1.2, 15.1.x before 15.1.3.1, 14.1.x before 14.1.4.3, 13.1.x before 13.1.4.1, and all versions of 12.1.x, when a WebSocket profile is configured on a virtual server, undisclosed requests can cause bd to terminate. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.. EPSS estimates a 0.93% chance of exploitation in the next 30 days.

Description

On BIG-IP Advanced WAF and BIG-IP ASM version 16.0.x before 16.0.1.2, 15.1.x before 15.1.3.1, 14.1.x before 14.1.4.3, 13.1.x before 13.1.4.1, and all versions of 12.1.x, when a WebSocket profile is configured on a virtual server, undisclosed requests can cause bd to terminate. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

0.93%

56.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
F5	Big-Ip Advanced Web Application Firewall	>= 12.1.0, <= 12.1.6
F5	Big-Ip Advanced Web Application Firewall	>= 13.1.0, <= 13.1.4
F5	Big-Ip Advanced Web Application Firewall	>= 14.1.0, <= 14.1.4
F5	Big-Ip Advanced Web Application Firewall	>= 15.1.0, <= 15.1.3
F5	Big-Ip Advanced Web Application Firewall	>= 16.0.0, <= 16.0.1.1
F5	Big-Ip Application Security Manager	>= 12.1.0, <= 12.1.6
F5	Big-Ip Application Security Manager	>= 13.1.0, <= 13.1.4
F5	Big-Ip Application Security Manager	>= 14.1.0, <= 14.1.4
F5	Big-Ip Application Security Manager	>= 15.1.0, <= 15.1.3
F5	Big-Ip Application Security Manager	>= 16.0.0, <= 16.0.1.1

References

https://support.f5.com/csp/article/K42051445Mitigation, Vendor Advisory
https://support.f5.com/csp/article/K42051445Mitigation, Vendor Advisory

Timeline

Published: Sep 14, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-23030?

How severe is CVE-2021-23030?

CVE-2021-23030 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.93% probability of exploitation in the next 30 days.

How do I fix CVE-2021-23030?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-23030?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST