CVE-2024-23979: BIG-IP SSL Client Certificate LDAP and CRLDP Authentication profiles vulnerability

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-02-14 · updated 2026-06-17
Weakness: CWE-770

Description

When SSL Client Certificate LDAP or Certificate Revocation List Distribution Point (CRLDP) authentication profile is configured on a virtual server, undisclosed requests can cause an increase in CPU resource utilization. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated

Affected products

F5 BIG-IP APM: from 15.1.0 before 15.1.9; from 16.1.0 before 16.1.4; 17.1.0 — fixed in 15.1.9, 16.1.4
BIG-IP: from 15.1.0 before 15.1.9; from 16.1.0 before 16.1.4; 17.1.0 — fixed in 15.1.9, 16.1.4
F5 Big-Ip Analytics: from 15.1.0 before 15.1.9; from 16.1.0 before 16.1.4; 17.1.0 — fixed in 15.1.9, 16.1.4
F5 Networks, Inc. BIG-IP (AAM): from 15.1.0 before 15.1.9; from 16.1.0 before 16.1.4; 17.1.0 — fixed in 15.1.9, 16.1.4
BIG-IP ASM: from 15.1.0 before 15.1.9; from 16.1.0 before 16.1.4; 17.1.0 — fixed in 15.1.9, 16.1.4
F5 BIG-IP DNS: from 15.1.0 before 15.1.9; from 16.1.0 before 16.1.4; 17.1.0 — fixed in 15.1.9, 16.1.4
F5 Big-Ip Fraud Protection Service: from 15.1.0 before 15.1.9; from 16.1.0 before 16.1.4; 17.1.0 — fixed in 15.1.9, 16.1.4
F5 Big-Ip Global Traffic Manager: from 15.1.0 before 15.1.9; from 16.1.0 before 16.1.4; 17.1.0 — fixed in 15.1.9, 16.1.4
F5 Big-Ip Link Controller: from 15.1.0 before 15.1.9; from 16.1.0 before 16.1.4; 17.1.0 — fixed in 15.1.9, 16.1.4
F5 BIG-IP (LTM): from 15.1.0 before 15.1.9; from 16.1.0 before 16.1.4; 17.1.0 — fixed in 15.1.9, 16.1.4
F5 Networks, Inc. BIG-IP (PEM): from 15.1.0 before 15.1.9; from 16.1.0 before 16.1.4; 17.1.0 — fixed in 15.1.9, 16.1.4
F5 BIG-IQ: from 8.0.0 through 8.3.0

How to fix

Upgrade to a fixed version: F5 BIG-IP APM 15.1.9, 16.1.4; BIG-IP 15.1.9, 16.1.4; F5 Big-Ip Analytics 15.1.9, 16.1.4; F5 Networks, Inc. BIG-IP (AAM) 15.1.9, 16.1.4; BIG-IP ASM 15.1.9, 16.1.4; F5 BIG-IP DNS 15.1.9, 16.1.4; F5 Big-Ip Fraud Protection Service 15.1.9, 16.1.4; F5 Big-Ip Global Traffic Manager 15.1.9, 16.1.4; F5 Big-Ip Link Controller 15.1.9, 16.1.4; F5 BIG-IP (LTM) 15.1.9, 16.1.4; F5 Networks, Inc. BIG-IP (PEM) 15.1.9, 16.1.4. Check the vendor advisory for mitigations.

References

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