CVE-2021-23016

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-05-10 · updated 2026-06-17

Description

On BIG-IP APM versions 15.1.x before 15.1.3, 14.1.x before 14.1.4.1, 13.1.x before 13.1.4, and all versions of 16.0.x, 12.1.x, and 11.6.x, an attacker may be able to bypass APM's internal restrictions and retrieve static content that is hosted within APM by sending specifically crafted requests to an APM Virtual Server. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Affected products

F5 BIG-IP APM: from 11.6.1 through 11.6.5; from 12.1.0 through 12.1.6; from 13.1.0 before 13.1.4; from 14.1.0 before 14.1.4.1; from 15.1.0 before 15.1.3; from 16.0.0 through 16.0.1 — fixed in 13.1.4, 14.1.4.1, 15.1.3

How to fix

Upgrade to a fixed version: F5 BIG-IP APM 13.1.4, 14.1.4.1, 15.1.3. Check the vendor advisory for mitigations.

References

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