CVE-2021-23016

Name: CVE-2021-23016
Creator: NVD / NIST
Published: 2021-05-10T15:15:07.523+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 0.83%

Last modified Jun 17, 2026

CVE-2021-23016 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. 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.. EPSS estimates a 0.83% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.3/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS Probability

0.83%

53.0th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
F5	Big-Ip Access Policy Manager	>= 11.6.1, <= 11.6.5
F5	Big-Ip Access Policy Manager	>= 12.1.0, <= 12.1.6
F5	Big-Ip Access Policy Manager	>= 13.1.0, < 13.1.4
F5	Big-Ip Access Policy Manager	>= 14.1.0, < 14.1.4.1
F5	Big-Ip Access Policy Manager	>= 15.1.0, < 15.1.3
F5	Big-Ip Access Policy Manager	>= 16.0.0, <= 16.0.1

References

https://support.f5.com/csp/article/K75540265Vendor Advisory
https://support.f5.com/csp/article/K75540265Vendor Advisory

Timeline

Published: May 10, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-23016?

How severe is CVE-2021-23016?

CVE-2021-23016 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 0.83% probability of exploitation in the next 30 days.

How do I fix CVE-2021-23016?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-23016?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST