CVE-2018-5540: F5 BIG-IP Domain Name System

Medium severity, CVSS 4.4. EPSS: 0.4% chance of exploitation in the next 30 days.

On F5 BIG-IP 13.0.0-13.0.1, 12.1.0-12.1.3.3, 11.6.0-11.6.3.1, or 11.5.1-11.5.6, Enterprise Manager 3.1.1, BIG-IQ Centralized Management 5.0.0-5.1.0, BIG-IQ Cloud and Orchestration 1.0.0, or F5 iWorkflow 2.1.0-2.3.0 the big3d process does not irrevocably minimize group privileges at start up.

Affected products

• F5 BIG-IP Domain Name System: from 11.5.1, up to and including 11.5.6; from 11.6.0, up to and including 11.6.3.1; from 12.1.0, up to and including 12.1.3.3; from 13.0.0, up to and including 13.0.1
• F5 BIG-IP Global Traffic Manager: from 11.5.1, up to and including 11.5.6; from 11.6.0, up to and including 11.6.3.1; from 12.1.0, up to and including 12.1.3.3; from 13.0.0, up to and including 13.0.1
• F5 BIG-IQ Centralized Management: from 5.0.0, up to and including 5.1.0
• F5 BIG-IQ Cloud And Orchestration: version 1.0.0 only
• F5 Enterprise Manager: version 3.1.1 only
• F5 f5 Iworkflow: from 2.1.0, up to and including 2.3.0

Published 2018-07-19. Last modified 2026-06-17.