CVE-2021-23047: F5 BIG-IP Access Policy Manager

Medium severity, CVSS 5.3. EPSS: 0.6% chance of exploitation in the next 30 days.

On version 16.x before 16.1.0, 15.1.x before 15.1.3.1, 14.1.x before 14.1.4.3, and all versions of 13.1.x, 12.1.x and 11.6.x, when BIG-IP APM performs Online Certificate Status Protocol (OCSP) verification of a certificate that contains Authority Information Access (AIA), undisclosed requests may cause an increase in memory use. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Affected products

• F5 BIG-IP Access Policy Manager: from 11.6.1, up to and including 11.6.5; from 12.1.0, up to and including 12.1.6; from 13.1.0, before 13.1.4 (fixed in 13.1.4); from 14.1.0, before 14.1.4.3 (fixed in 14.1.4.3); from 15.1.0, before 15.1.3.1 (fixed in 15.1.3.1); from 16.0.0, up to and including 16.0.1

Published 2021-09-14. Last modified 2026-06-17.