CVE-2021-23021

Name: CVE-2021-23021
Creator: NVD / NIST
Published: 2021-06-01T13:15:08.01+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 0.23%

Last modified Jun 17, 2026

CVE-2021-23021 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. The Nginx Controller 3.x before 3.7.0 agent configuration file /etc/controller-agent/agent.conf is world readable with current permission bits set to 644.. EPSS estimates a 0.23% chance of exploitation in the next 30 days.

Description

The Nginx Controller 3.x before 3.7.0 agent configuration file /etc/controller-agent/agent.conf is world readable with current permission bits set to 644.

Metrics

CVSS 3.1

5.5/10

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

EPSS Probability

0.23%

13.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
F5	Nginx Controller	>= 3.0.0, < 3.7.0

References

https://support.f5.com/csp/article/K36926027Vendor Advisory
https://support.f5.com/csp/article/K36926027Vendor Advisory

Timeline

Published: Jun 1, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-23021?

The Nginx Controller 3.x before 3.7.0 agent configuration file /etc/controller-agent/agent.conf is world readable with current permission bits set to 644.

How severe is CVE-2021-23021?

CVE-2021-23021 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.23% probability of exploitation in the next 30 days.

How do I fix CVE-2021-23021?

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-2021-23021?

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

Scan your code now

Source: NVD / NIST