Description
In NTFS-3G versions < 2021.8.22, when a specially crafted NTFS attribute is supplied to the function ntfs_get_attribute_value, a heap buffer overflow can occur allowing for memory disclosure or denial of service. The vulnerability is caused by an out-of-bound buffer access which can be triggered by mounting a crafted ntfs partition. The root cause is a missing consistency check after reading an MFT record : the "bytes_in_use" field should be less than the "bytes_allocated" field. When it is not, the parsing of the records proceeds into the wild.
Published: 2021-09-07
Score: 6.7 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories
Source ID Title
Debian DLA Debian DLA DLA-2819-1 ntfs-3g security update
Debian DSA Debian DSA DSA-4971-1 ntfs-3g security update
EUVD EUVD EUVD-2021-19996 In NTFS-3G versions < 2021.8.22, when a specially crafted NTFS attribute is supplied to the function ntfs_get_attribute_value, a heap buffer overflow can occur allowing for memory disclosure or denial of service. The vulnerability is caused by an out-of-bound buffer access which can be triggered by mounting a crafted ntfs partition. The root cause is a missing consistency check after reading an MFT record : the "bytes_in_use" field should be less than the "bytes_allocated" field. When it is not, the parsing of the records proceeds into the wild.
History

Wed, 03 Dec 2025 15:15:00 +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'}


Subscriptions

Debian Debian Linux
Fedoraproject Fedora
Redhat Advanced Virtualization Enterprise Linux
Tuxera Ntfs-3g
cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2025-12-03T14:52:54.868Z

Reserved: 2021-05-20T00:00:00.000Z

Link: CVE-2021-33285

cve-icon Vulnrichment

Updated: 2024-08-03T23:42:20.414Z

cve-icon NVD

Status : Modified

Published: 2021-09-07T14:15:11.567

Modified: 2025-12-03T15:15:49.240

Link: CVE-2021-33285

cve-icon Redhat

Severity : Moderate

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

Links: CVE-2021-33285 - Bugzilla

cve-icon OpenCVE Enrichment

No data.

Weaknesses