CVE-2021-4122

Name: CVE-2021-4122
Creator: NVD / NIST
Published: 2022-08-24T16:15:09.427+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.3/10EPSS 0.28%

Last modified Jun 17, 2026

CVE-2021-4122 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. It was found that a specially crafted LUKS header could trick cryptsetup into disabling encryption during the recovery of the device. An attacker with physical access to the medium, such as a flash disk, could use this flaw to force a user into permanently disabling the encryption layer of that medium.. EPSS estimates a 0.28% chance of exploitation in the next 30 days.

Description

It was found that a specially crafted LUKS header could trick cryptsetup into disabling encryption during the recovery of the device. An attacker with physical access to the medium, such as a flash disk, could use this flaw to force a user into permanently disabling the encryption layer of that medium.

Metrics

CVSS 3.1

4.3/10

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

EPSS Probability

0.28%

19.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Cryptsetup Project	Cryptsetup	< 2.3.7
Cryptsetup Project	Cryptsetup	>= 2.4.0, < 2.4.3

References

https://access.redhat.com/security/cve/CVE-2021-4122Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2031859Permissions Required, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2032401Issue Tracking, Third Party Advisory
https://gitlab.com/cryptsetup/cryptsetup/-/commit/0113ac2d889c5322659ad0596d4cfc6da53e356cPatch, Third Party Advisory
https://mirrors.edge.kernel.org/pub/linux/utils/cryptsetup/v2.4/v2.4.3-ReleaseNotesRelease Notes, Vendor Advisory
https://access.redhat.com/security/cve/CVE-2021-4122Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2031859Permissions Required, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2032401Issue Tracking, Third Party Advisory
https://gitlab.com/cryptsetup/cryptsetup/-/commit/0113ac2d889c5322659ad0596d4cfc6da53e356cPatch, Third Party Advisory
https://mirrors.edge.kernel.org/pub/linux/utils/cryptsetup/v2.4/v2.4.3-ReleaseNotesRelease Notes, Vendor Advisory

Timeline

Published: Aug 24, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-4122?

How severe is CVE-2021-4122?

CVE-2021-4122 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 0.28% probability of exploitation in the next 30 days.

How do I fix CVE-2021-4122?

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-2021-4122?

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

Scan your code now

Source: NVD / NIST