CVE-2021-23128

Name: CVE-2021-23128
Creator: NVD / NIST
Published: 2021-03-04T18:15:13.363+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.1/10EPSS 1.57%

Last modified Jun 17, 2026

CVE-2021-23128 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. An issue was discovered in Joomla! 3.2.0 through 3.9.24. The core shipped but unused randval implementation within FOF (FOFEncryptRandval) used an potential insecure implemetation. EPSS estimates a 1.57% chance of exploitation in the next 30 days.

Description

An issue was discovered in Joomla! 3.2.0 through 3.9.24. The core shipped but unused randval implementation within FOF (FOFEncryptRandval) used an potential insecure implemetation. That has now been replaced with a call to 'random_bytes()' and its backport that is shipped within random_compat.

Metrics

CVSS 3.1

9.1/10

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

EPSS Probability

1.57%

72.2th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Joomla	Joomla\!	>= 3.2.0, < 3.9.25

References

Timeline

Published: Mar 4, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-23128?

How severe is CVE-2021-23128?

CVE-2021-23128 has a CVSS score of 9.1/10 (CRITICAL severity). The EPSS model estimates a 1.57% probability of exploitation in the next 30 days.

How do I fix CVE-2021-23128?

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-2021-23128?

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

Scan your code now

Source: NVD / NIST