CVE-2018-5521: F5 BIG-IP Access Policy Manager

Medium severity, CVSS 6.1. EPSS: 0.9% chance of exploitation in the next 30 days.

On F5 BIG-IP 12.1.0-12.1.3.1, 11.6.1-11.6.3.1, 11.5.1-11.5.5, or 11.2.1, carefully crafted URLs can be used to reflect arbitrary content into GeoIP lookup responses, potentially exposing clients to XSS.

Affected products

• F5 BIG-IP Access Policy Manager: from 11.5.1, up to and including 11.5.5; from 11.6.1, up to and including 11.6.3; from 12.1.0, up to and including 12.1.3; version 11.2.1 only
• F5 BIG-IP Advanced Firewall Manager: from 11.5.1, up to and including 11.5.5; from 11.6.1, up to and including 11.6.3; from 12.1.0, up to and including 12.1.3; version 11.2.1 only
• F5 BIG-IP Analytics: from 11.5.1, up to and including 11.5.5; from 11.6.1, up to and including 11.6.3; from 12.1.0, up to and including 12.1.3; version 11.2.1 only
• F5 BIG-IP Application Acceleration Manager: from 11.5.1, up to and including 11.5.5; from 11.6.1, up to and including 11.6.3; from 12.1.0, up to and including 12.1.3; version 11.2.1 only
• F5 BIG-IP Application Security Manager: from 11.5.1, up to and including 11.5.5; from 11.6.1, up to and including 11.6.3; from 12.1.0, up to and including 12.1.3; version 11.2.1 only
• F5 BIG-IP Domain Name System: from 11.5.1, up to and including 11.5.5; from 11.6.1, up to and including 11.6.3; from 12.1.0, up to and including 12.1.3; version 11.2.1 only
• F5 BIG-IP Edge Gateway: from 11.5.1, up to and including 11.5.5; from 11.6.1, up to and including 11.6.3; from 12.1.0, up to and including 12.1.3; version 11.2.1 only
• F5 BIG-IP Global Traffic Manager: from 11.5.1, up to and including 11.5.5; from 11.6.1, up to and including 11.6.3; from 12.1.0, up to and including 12.1.3; version 11.2.1 only
• F5 BIG-IP Link Controller: from 11.5.1, up to and including 11.5.5; from 11.6.1, up to and including 11.6.3; from 12.1.0, up to and including 12.1.3; version 11.2.1 only
• F5 BIG-IP Local Traffic Manager: from 11.5.1, up to and including 11.5.5; from 11.6.1, up to and including 11.6.3; from 12.1.0, up to and including 12.1.3; version 11.2.1 only
• F5 BIG-IP Policy Enforcement Manager: from 11.5.1, up to and including 11.5.5; from 11.6.1, up to and including 11.6.3; from 12.1.0, up to and including 12.1.3; version 11.2.1 only
• F5 BIG-IP Webaccelerator: from 11.5.1, up to and including 11.5.5; from 11.6.1, up to and including 11.6.3; from 12.1.0, up to and including 12.1.3; version 11.2.1 only
• F5 BIG-IP Websafe: from 11.5.1, up to and including 11.5.5; from 11.6.1, up to and including 11.6.3; from 12.1.0, up to and including 12.1.3; version 11.2.1 only

Published 2018-06-01. Last modified 2026-06-17.