Reference page — cumulative record through Monday, October 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2021-4122

CVE-2021-4122MEDIUM

n/a cryptsetup — It was found that a specially crafted LUKS header could trick cryptsetup into disabling encryption during the recovery of the device.

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   P   L   N   R  U  N  H  N    4.3   .0032   23.4     —

AFFECTED
  Product     Versions                                       Fixed
  cryptsetup  Fixed in cryptsetup 2.4.3, cryptsetup 2.3.7 –  —

TIMELINE
  Dec 15  Reserved by redhat
  Aug 24  Published (CNA: redhat)
  Oct 14  ENRICHED — CVE-2021-4122 (cryptsetup). Received CVSS 4.3 and CPE data from NVD.

CWE-345 · CNA: redhat · CVSS v3.1 · 6 references · NVD status: Modified

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
December 15, 2021	Reserved	Reserved by redhat
August 24, 2022	Published	Published (CNA: redhat)
October 14, 2026	ENRICHED	ENRICHED — CVE-2021-4122 (cryptsetup). Received CVSS 4.3 and CPE data from NVD.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
n/a	cryptsetup	—	Fixed in cryptsetup 2.4.3, cryptsetup 2.3.7	—

Weaknesses

CWE-345

References (6)

https://access.redhat.com/security/cve/CVE-2021-4122 [Third Party Advisory]
https://bugzilla.redhat.com/show_bug.cgi?id=2031859 [Permissions Required, Third Party Advisory]
https://bugzilla.redhat.com/show_bug.cgi?id=2032401 [Issue Tracking, Third Party Advisory]
https://cert-portal.siemens.com/productcert/html/ssa-398330.html
https://gitlab.com/cryptsetup/cryptsetup/-/commit/0113ac2d889c5322659ad0596d4cfc6da53e356c [Patch, Third Party Advisory]
https://mirrors.edge.kernel.org/pub/linux/utils/cryptsetup/v2.4/v2.4.3-ReleaseNotes [Release Notes, Vendor Advisory]

Authoritative record: CVE-2021-4122 at cve.org

Weaknesses: CWE-345

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2021-4122 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Monday, October 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.