CVE-2018-5538: F5 BIG-IP Domain Name System

Low severity, CVSS 3.7. EPSS: 0.8% chance of exploitation in the next 30 days.

On F5 BIG-IP DNS 13.1.0-13.1.0.7, 12.1.3-12.1.3.5, DNS Express / DNS Zones accept NOTIFY messages on the management interface from source IP addresses not listed in the 'Allow NOTIFY From' configuration parameter when the db variable "dnsexpress.notifyport" is set to any value other than the default of "0".

Affected products

• F5 BIG-IP Domain Name System: from 12.1.3, up to and including 12.1.3.5; after 13.1.0, up to and including 13.1.0.7
• F5 BIG-IP Global Traffic Manager: from 12.1.3, up to and including 12.1.3.5; from 13.1.0, up to and including 13.1.0.7
• F5 BIG-IP Link Controller: from 12.1.3, up to and including 12.1.3.5; from 13.1.0, up to and including 13.1.0.7
• F5 BIG-IP Local Traffic Manager: from 12.1.3, up to and including 12.1.3.5; from 13.1.0, up to and including 13.1.0.7

Published 2018-07-25. Last modified 2026-06-17.