CVE-2018-5502

Severity: high (CVSS 7.5 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2018-03-22 · updated 2026-06-17
Weakness: CWE-295

Description

On F5 BIG-IP versions 13.0.0 - 13.1.0.3, attackers may be able to disrupt services on the BIG-IP system with maliciously crafted client certificate. This vulnerability affects virtual servers associated with Client SSL profile which enables the use of client certificate authentication. Client certificate authentication is not enabled by default in Client SSL profile. There is no control plane exposure.

Affected products

F5 BIG-IP APM: from 13.0.0 before 13.1.0.4 — fixed in 13.1.0.4
BIG-IP: from 13.0.0 before 13.1.0.4 — fixed in 13.1.0.4
F5 Big-Ip Analytics: from 13.0.0 before 13.1.0.4 — fixed in 13.1.0.4
F5 Networks, Inc. BIG-IP (AAM): from 13.0.0 before 13.1.0.4 — fixed in 13.1.0.4
BIG-IP ASM: from 13.0.0 before 13.1.0.4 — fixed in 13.1.0.4
F5 BIG-IP DNS: from 13.0.0 through 13.1.0.4
F5 Big-Ip Edge Gateway: from 13.0.0 before 13.1.0.4 — fixed in 13.1.0.4
F5 Big-Ip Global Traffic Manager: from 13.0.0 before 13.1.0.4 — fixed in 13.1.0.4
F5 Big-Ip Link Controller: from 13.0.0 before 13.1.0.4 — fixed in 13.1.0.4
F5 BIG-IP (LTM): from 13.0.0 before 13.1.0.4 — fixed in 13.1.0.4
F5 Networks, Inc. BIG-IP (PEM): from 13.0.0 before 13.1.0.4 — fixed in 13.1.0.4
F5 Big-Ip Webaccelerator: from 13.0.0 before 13.1.0.4 — fixed in 13.1.0.4
F5 Big-Ip Websafe: 1.0.0

How to fix

Upgrade to a fixed version: F5 BIG-IP APM 13.1.0.4; BIG-IP 13.1.0.4; F5 Big-Ip Analytics 13.1.0.4; F5 Networks, Inc. BIG-IP (AAM) 13.1.0.4; BIG-IP ASM 13.1.0.4; F5 Big-Ip Edge Gateway 13.1.0.4; F5 Big-Ip Global Traffic Manager 13.1.0.4; F5 Big-Ip Link Controller 13.1.0.4; F5 BIG-IP (LTM) 13.1.0.4; F5 Networks, Inc. BIG-IP (PEM) 13.1.0.4; F5 Big-Ip Webaccelerator 13.1.0.4. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2018-5502 or the next vulnerability affects your stack