A crafted NTFS image can cause a NULL pointer dereference in ntfs_extent_inode_open in NTFS-3G < 2021.8.22.

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required High

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

Access Vector Local

Access Complexity Medium

Authentication None

Confidentiality Impact Complete

Integrity Impact Complete

Availability Impact Complete

This CVE is not in the KEV list.

Exploitation none

Automatable no

Technical Impact total

Affected Vendors & Products

Vendors Products
Debian
  • Debian Linux
Fedoraproject
  • Fedora
Redhat
  • Advanced Virtualization
  • Enterprise Linux
Tuxera
  • Ntfs-3g

Configuration 1 [-]

cpe:2.3:a:tuxera:ntfs-3g:*:*:*:*:*:*:*:*

Configuration 2 [-]

OR cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*

Configuration 3 [-]

OR cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:-:*:*:*
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:advanced_virtualization:*:*:*

Configuration 4 [-]

OR cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*
Package CPE Advisory Released Date
Advanced Virtualization for RHEL 8.2.1
virt:8.2-8020120210917153657.863bb0db cpe:/a:redhat:advanced_virtualization:8.2::el8 RHSA-2021:3704 2021-09-30T00:00:00Z
virt-devel:8.2-8020120210917153657.863bb0db cpe:/a:redhat:advanced_virtualization:8.2::el8 RHSA-2021:3704 2021-09-30T00:00:00Z
Advanced Virtualization for RHEL 8.4.0.Z
virt:av-8040020210922084349.522a0ee4 cpe:/a:redhat:advanced_virtualization:8.4::el8 RHSA-2021:3703 2021-09-30T00:00:00Z
virt-devel:av-8040020210922084349.522a0ee4 cpe:/a:redhat:advanced_virtualization:8.4::el8 RHSA-2021:3703 2021-09-30T00:00:00Z
Red Hat Enterprise Linux 8
virt-devel:rhel-8060020220408104655.d63f516d cpe:/a:redhat:enterprise_linux:8 RHSA-2022:1759 2022-05-10T00:00:00Z
virt:rhel-8060020220408104655.d63f516d cpe:/a:redhat:enterprise_linux:8 RHSA-2022:1759 2022-05-10T00:00:00Z
References
Link Providers
http://www.openwall.com/lists/oss-security/2021/08/30/1 cve-icon cve-icon
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=988386 cve-icon cve-icon
https://bugzilla.redhat.com/show_bug.cgi?id=2001649 cve-icon cve-icon
https://github.com/tuxera/ntfs-3g/releases cve-icon cve-icon
https://github.com/tuxera/ntfs-3g/security/advisories/GHSA-q759-8j5v-q5jp cve-icon cve-icon cve-icon
https://lists.debian.org/debian-lts-announce/2021/11/msg00013.html cve-icon cve-icon
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/766ISTT3KCARKFUIQT7N6WV6T63XOKG3/ cve-icon cve-icon
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HSEKTKHO5HFZHWZNJNBJZA56472KRUZI/ cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2021-39251 cve-icon
https://security.gentoo.org/glsa/202301-01 cve-icon cve-icon
https://www.cve.org/CVERecord?id=CVE-2021-39251 cve-icon
https://www.debian.org/security/2021/dsa-4971 cve-icon cve-icon
History

Tue, 02 Dec 2025 22:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-20
Metrics cvssV3_1

{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}

 ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

cvssV3_1

{'score': 6.7, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H'}
cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published: 2021-09-07T00:00:00.000Z

Updated: 2025-12-02T21:23:50.479Z

Reserved: 2021-08-17T00:00:00.000Z

Link: CVE-2021-39251

cve-icon Vulnrichment

Updated: 2024-08-04T02:06:40.959Z

cve-icon NVD

Status : Modified

Published: 2021-09-07T15:15:07.810

Modified: 2025-12-02T22:16:05.493

Link: CVE-2021-39251

cve-icon Redhat

Severity : Moderate

Publid Date: 2021-08-30T00:00:00Z

Links: CVE-2021-39251 - Bugzilla