CVE-2021-23047

Name: CVE-2021-23047
Creator: NVD / NIST
Published: 2021-09-14T14:15:10.263+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 0.58%

Last modified Jun 17, 2026

CVE-2021-23047 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. 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.. EPSS estimates a 0.58% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

5.3/10

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

EPSS Probability

0.58%

43.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

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, < 14.1.4.3
F5	Big-Ip Access Policy Manager	>= 15.1.0, < 15.1.3.1
F5	Big-Ip Access Policy Manager	>= 16.0.0, <= 16.0.1

References

https://support.f5.com/csp/article/K79428827Vendor Advisory
https://support.f5.com/csp/article/K79428827Vendor Advisory

Timeline

Published: Sep 14, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-23047?

How severe is CVE-2021-23047?

CVE-2021-23047 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 0.58% probability of exploitation in the next 30 days.

How do I fix CVE-2021-23047?

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-2021-23047?

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

Scan your code now

Source: NVD / NIST