---
id: CVE-2021-33287
title: >-
  In NTFS-3G versions < 2021.8.22, when specially crafted NTFS attributes are
  read in the function ntfs_attr_pread_i, a heap buffer overflow can occur and
  allow for writing to arbitrary memory or denial of service of the application.
summary: >-
  In NTFS-3G versions < 2021.8.22, when specially crafted NTFS attributes are
  read in the function ntfs_attr_pread_i, a heap buffer overflow can occur and
  allow for writing to arbitrary memory or denial of service of the application.
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-787
  - CWE-20
vendor: tuxera
product: ntfs-3g
affected:
  - ntfs-3g < 2021.8.22
  - debian_linux = 9.0
  - debian_linux = 10.0
  - debian_linux = 11.0
  - fedora = 33
  - fedora = 35
patched:
  - ntfs-3g 2021.8.22
published: '2021-09-07'
updated: '2026-07-05'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2021-33287'
references:
  - url: 'http://www.openwall.com/lists/oss-security/2021/08/30/1'
    label: cve@mitre.org
  - url: 'https://github.com/tuxera/ntfs-3g/security/advisories/GHSA-q759-8j5v-q5jp'
    label: cve@mitre.org
  - url: 'https://lists.debian.org/debian-lts-announce/2021/11/msg00013.html'
    label: cve@mitre.org
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/766ISTT3KCARKFUIQT7N6WV6T63XOKG3/
    label: cve@mitre.org
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/HSEKTKHO5HFZHWZNJNBJZA56472KRUZI/
    label: cve@mitre.org
  - url: 'https://security.gentoo.org/glsa/202301-01'
    label: cve@mitre.org
  - url: 'https://www.debian.org/security/2021/dsa-4971'
    label: cve@mitre.org
  - url: 'http://ntfs-3g.com'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://tuxera.com'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://www.openwall.com/lists/oss-security/2021/08/30/1'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://github.com/tuxera/ntfs-3g/security/advisories/GHSA-q759-8j5v-q5jp'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2021/11/msg00013.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/766ISTT3KCARKFUIQT7N6WV6T63XOKG3/
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HSEKTKHO5HFZHWZNJNBJZA56472KRUZI/
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://security.gentoo.org/glsa/202301-01'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://www.debian.org/security/2021/dsa-4971'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.00414
epssPercentile: 0.32895
ingestedAt: '2026-07-06T01:08:17.000Z'
---

## Overview

In NTFS-3G versions < 2021.8.22, when specially crafted NTFS attributes are read in the function ntfs_attr_pread_i, a heap buffer overflow can occur and allow for writing to arbitrary memory or denial of service of the application.

## Affected

- `ntfs-3g < 2021.8.22`
- `debian_linux = 9.0`
- `debian_linux = 10.0`
- `debian_linux = 11.0`
- `fedora = 33`
- `fedora = 35`

## Remediation

Upgrade past the affected range:

- `ntfs-3g 2021.8.22`