CVE-2023-23555: BIG-IP Virtual Edition vulnerability

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% 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-665

Description

On BIG-IP Virtual Edition versions 15.1x beginning in 15.1.4 to before 15.1.8 and 14.1.x beginning in 14.1.5 to before 14.1.5.3, and BIG-IP SPK beginning in 1.5.0 to before 1.6.0, when FastL4 profile is configured on a virtual server, undisclosed traffic can cause the Traffic Management Microkernel (TMM) to terminate. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Affected products

F5 BIG-IP APM: from 14.1.5 before 14.1.5.3; from 15.1.4 before 15.1.8 — fixed in 14.1.5.3, 15.1.8
BIG-IP: from 14.1.5 before 14.1.5.3; from 15.1.0 before 15.1.8 — fixed in 14.1.5.3, 15.1.8
F5 Big-Ip Analytics: from 14.1.5 before 14.1.5.3; from 15.1.4 before 15.1.8 — fixed in 14.1.5.3, 15.1.8
F5 Networks, Inc. BIG-IP (AAM): from 14.1.5 before 14.1.5.3; from 15.1.4 before 15.1.8 — fixed in 14.1.5.3, 15.1.8
BIG-IP ASM: from 14.1.5 before 14.1.5.3; from 15.1.4 before 15.1.8 — fixed in 14.1.5.3, 15.1.8
F5 Big-Ip Ddos Hybrid Defender: from 14.1.5 before 14.1.5.3; from 15.1.4 before 15.1.8 — fixed in 14.1.5.3, 15.1.8
F5 BIG-IP DNS: from 14.1.5 before 14.1.5.3; from 15.1.4 before 15.1.8 — fixed in 14.1.5.3, 15.1.8
F5 Big-Ip Fraud Protection Service: from 14.1.5 before 14.1.5.3; from 15.1.4 before 15.1.8 — fixed in 14.1.5.3, 15.1.8
F5 Big-Ip Link Controller: from 14.1.5 before 14.1.5.3; from 15.1.4 before 15.1.8 — fixed in 14.1.5.3, 15.1.8
F5 BIG-IP (LTM): from 14.1.5 before 14.1.5.3; from 15.1.4 before 15.1.8 — fixed in 14.1.5.3, 15.1.8
F5 Networks, Inc. BIG-IP (PEM): from 14.1.5 before 14.1.5.3; from 15.1.4 before 15.1.8 — fixed in 14.1.5.3, 15.1.8
F5 Big-Ip Service Proxy: from 1.5.0 before 1.6.0 — fixed in 1.6.0
F5 Big-Ip Ssl Orchestrator: from 14.1.5 before 14.1.5.3; from 15.1.4 before 15.1.8 — fixed in 14.1.5.3, 15.1.8

How to fix

Upgrade to a fixed version: F5 BIG-IP APM 14.1.5.3, 15.1.8; BIG-IP 14.1.5.3, 15.1.8; F5 Big-Ip Analytics 14.1.5.3, 15.1.8; F5 Networks, Inc. BIG-IP (AAM) 14.1.5.3, 15.1.8; BIG-IP ASM 14.1.5.3, 15.1.8; F5 Big-Ip Ddos Hybrid Defender 14.1.5.3, 15.1.8; F5 BIG-IP DNS 14.1.5.3, 15.1.8; F5 Big-Ip Fraud Protection Service 14.1.5.3, 15.1.8; F5 Big-Ip Link Controller 14.1.5.3, 15.1.8; F5 BIG-IP (LTM) 14.1.5.3, 15.1.8; F5 Networks, Inc. BIG-IP (PEM) 14.1.5.3, 15.1.8; F5 Big-Ip Service Proxy 1.6.0. Check the vendor advisory for mitigations.

References

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