CVE-2018-5503

Severity: high (CVSS 7.5 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.7% 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-20

Description

On F5 BIG-IP versions 13.0.0 - 13.1.0.3 or 12.0.0 - 12.1.3.1, TMM may restart when processing a specifically crafted page through a virtual server with an associated PEM policy that has content insertion as an action.

Affected products

F5 Networks, Inc. BIG-IP (PEM): from 12.0.0 before 12.1.3.2; from 13.0.0 before 13.1.0.4 — fixed in 12.1.3.2, 13.1.0.4

How to fix

Upgrade to a fixed version: F5 Networks, Inc. BIG-IP (PEM) 12.1.3.2, 13.1.0.4. Check the vendor advisory for mitigations.

References

http://www.securitytracker.com/id/1040560
https://support.f5.com/csp/article/K54562183
http://www.securitytracker.com/id/1040560
https://support.f5.com/csp/article/K54562183

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