CVE-2021-23033

7.5 highEPSS 0.9%

High (7.5) in f5. EPSS 0.9% chance of exploitation in the next 30 days.

On BIG-IP Advanced WAF and BIG-IP ASM version 16.x before 16.1.0x, 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.

Severity

CVSS 3.1

7.5 high

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

EPSS: 0.9% chance of exploitation in the next 30 days; higher than 60% of CVEs (scores of 2026-10-31)
CWE: CWE-20
Published: 2021-09-14
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

f5:big-ip_advanced_web_application_firewall
f5:big-ip_application_security_manager

References

https://support.f5.com/csp/article/K05314769
https://support.f5.com/csp/article/K05314769

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