CVE-2023-23552: BIG-IP Advanced WAF and ASM vulnerability

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-02-01 · updated 2026-06-17
Weakness: CWE-400

Description

On versions 17.0.x before 17.0.0.2, 16.1.x before 16.1.3.3, 15.1.0 before 15.1.8, 14.1.x before 14.1.5.3, and all versions of 13.1.x, when a BIG-IP Advanced WAF or BIG-IP ASM security policy is configured on a virtual server, undisclosed requests can cause an increase in memory resource utilization. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Affected products

F5 Big-Ip Advanced Web Application Firewall: from 13.1.0 through 13.1.5; from 14.1.0 before 14.1.5.3; from 15.1.0 before 15.1.8; from 16.1.0 before 16.1.3.3; from 17.0.0 before 17.0.0.2 — fixed in 14.1.5.3, 15.1.8, 16.1.3.3, 17.0.0.2
BIG-IP ASM: from 13.1.0 through 13.1.5; from 14.1.0 before 14.1.5.3; from 15.1.0 before 15.1.8; from 16.1.0 before 16.1.3.3; from 17.0.0 before 17.0.0.2 — fixed in 14.1.5.3, 15.1.8, 16.1.3.3, 17.0.0.2

How to fix

Upgrade to a fixed version: F5 Big-Ip Advanced Web Application Firewall 14.1.5.3, 15.1.8, 16.1.3.3, 17.0.0.2; BIG-IP ASM 14.1.5.3, 15.1.8, 16.1.3.3, 17.0.0.2. Check the vendor advisory for mitigations.

References

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