CVE-2020-5871: F5 BIG-IP Access Policy Manager

High severity, CVSS 7.5. EPSS: 1% chance of exploitation in the next 30 days.

On BIG-IP 14.1.0-14.1.2.3, undisclosed requests can lead to a denial of service (DoS) when sent to BIG-IP HTTP/2 virtual servers. The problem can occur when ciphers, which have been blacklisted by the HTTP/2 RFC, are used on backend servers. This is a data-plane issue. There is no control-plane exposure.

Affected products

• F5 BIG-IP Access Policy Manager: from 14.1.0, up to and including 14.1.2.3
• F5 BIG-IP Advanced Firewall Manager: from 14.1.0, up to and including 14.1.2.3
• F5 BIG-IP Analytics: from 14.1.0, up to and including 14.1.2.3
• F5 BIG-IP Application Acceleration Manager: from 14.1.0, up to and including 14.1.2.3
• F5 BIG-IP Application Security Manager: from 14.1.0, up to and including 14.1.2.3
• F5 BIG-IP Domain Name System: from 14.1.0, up to and including 14.1.2.3
• F5 BIG-IP Fraud Protection Service: from 14.1.0, up to and including 14.1.2.3
• F5 BIG-IP Global Traffic Manager: from 14.1.0, up to and including 14.1.2.3
• F5 BIG-IP Link Controller: from 14.1.0, up to and including 14.1.2.3
• F5 BIG-IP Local Traffic Manager: from 14.1.0, up to and including 14.1.2.3
• F5 BIG-IP Policy Enforcement Manager: from 14.1.0, up to and including 14.1.2.3

Published 2020-04-30. Last modified 2026-06-17.