CVE-2018-5520: F5 BIG-IP Access Policy Manager

Medium severity, CVSS 4.4. EPSS: 1% chance of exploitation in the next 30 days.

On an F5 BIG-IP 13.0.0-13.1.0.5, 12.1.0-12.1.3.1, or 11.2.1-11.6.3.1 system configured in Appliance mode, the TMOS Shell (tmsh) may allow an administrative user to use the dig utility to gain unauthorized access to file system resources.

Affected products

  • F5 BIG-IP Access Policy Manager: from 11.2.1, up to and including 11.6.3; from 12.1.0, up to and including 12.1.3; from 13.0.0, up to and including 13.1.0
  • F5 BIG-IP Advanced Firewall Manager: from 11.2.1, up to and including 11.6.3; from 12.1.0, up to and including 12.1.3; from 13.0.0, up to and including 13.1.0
  • F5 BIG-IP Analytics: from 11.2.1, up to and including 11.6.3; from 12.1.0, up to and including 12.1.3; from 13.0.0, up to and including 13.1.0
  • F5 BIG-IP Application Acceleration Manager: from 11.2.1, up to and including 11.6.3; from 12.1.0, up to and including 12.1.3; from 13.0.0, up to and including 13.1.0
  • F5 BIG-IP Application Security Manager: from 11.2.1, up to and including 11.6.3; from 12.1.0, up to and including 12.1.3; from 13.0.0, up to and including 13.1.0
  • F5 BIG-IP Domain Name System: from 11.2.1, up to and including 11.6.3; from 12.1.0, up to and including 12.1.3; from 13.0.0, up to and including 13.1.0
  • F5 BIG-IP Edge Gateway: from 11.2.1, up to and including 11.6.3; from 12.1.0, up to and including 12.1.3; from 13.0.0, up to and including 13.1.0
  • F5 BIG-IP Global Traffic Manager: from 11.2.1, up to and including 11.6.3; from 12.1.0, up to and including 12.1.3; from 13.0.0, up to and including 13.1.0
  • F5 BIG-IP Link Controller: from 11.2.1, up to and including 11.6.3; from 12.1.0, up to and including 12.1.3; from 13.0.0, up to and including 13.1.0
  • F5 BIG-IP Local Traffic Manager: from 11.2.1, up to and including 11.6.3; from 12.1.0, up to and including 12.1.3; from 13.0.0, up to and including 13.1.0
  • F5 BIG-IP Policy Enforcement Manager: from 11.2.1, up to and including 11.6.3; from 12.1.0, up to and including 12.1.3; from 13.0.0, up to and including 13.1.0
  • F5 BIG-IP Webaccelerator: from 11.2.1, up to and including 11.6.3; from 12.1.0, up to and including 12.1.3; from 13.0.0, up to and including 13.1.0
  • F5 BIG-IP Websafe: from 11.2.1, up to and including 11.6.3; from 12.1.0, up to and including 12.1.3; from 13.0.0, up to and including 13.1.0

Published 2018-05-02. Last modified 2026-06-17.