Vulnerability-Lookup

CVE-2021-39251 (GCVE-0-2021-39251)

Vulnerability from cvelistv5 – Published: 2021-09-07 00:00 – Updated: 2025-12-02 21:23

Summary

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

Severity

6.7 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-12-02 21:23 UTC

CWE

n/a
CWE-20 - Improper Input Validation
CWE-476 - NULL Pointer Dereference

Assigner

mitre mitre root

References

10 references

URL	Tags
https://github.com/tuxera/ntfs-3g/releases
https://github.com/tuxera/ntfs-3g/security/adviso…
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug…
http://www.openwall.com/lists/oss-security/2021/08/30/1
https://bugzilla.redhat.com/show_bug.cgi?id=2001649
https://www.debian.org/security/2021/dsa-4971	vendor-advisory
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory
https://lists.debian.org/debian-lts-announce/2021…	mailing-list
https://security.gentoo.org/glsa/202301-01	vendor-advisory

Show details on NVD website

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            "lang": "en",
            "value": "A crafted NTFS image can cause a NULL pointer dereference in ntfs_extent_inode_open in NTFS-3G \u003c 2021.8.22."
          },
          {
            "lang": "es",
            "value": "Una imagen NTFS dise\u00f1ada puede causar una desreferencia de puntero NULL en la funci\u00f3n ntfs_extent_inode_open en NTFS-3G versiones anteriores a 2021.8.22"
          }
        ],
        "id": "CVE-2021-39251",
        "lastModified": "2025-12-02T22:16:05.493",
        "metrics": {
          "cvssMetricV2": [
            {
              "acInsufInfo": false,
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              "exploitabilityScore": 3.4,
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}

RHSA-2021:3703

Vulnerability from csaf_redhat - Published: 2021-09-30 16:59 - Updated: 2026-07-05 01:24

Summary

Red Hat Security Advisory: virt:av and virt-devel:av security and bug fix update

Severity

Moderate

Scope

25 vulnerabilities in this advisory, including CVE-2021-39251.

CVE-2021-39251

The ntfs3g package is susceptible to an input validation attack. When processing a crafted NTFS image there is an improper check. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.

7.8 (High)


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

Fixed: 957 products

https://access.redhat.com/errata/RHSA-2021:3703

Open the full advisory

RHSA-2021:3704

Vulnerability from csaf_redhat - Published: 2021-09-30 19:06 - Updated: 2026-07-05 01:24

Summary

Red Hat Security Advisory: virt:8.2 and virt-devel:8.2 security update

Severity

Moderate

Scope

24 vulnerabilities in this advisory, including CVE-2021-39251.

CVE-2021-39251

7.8 (High)


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

Fixed: 918 products

https://access.redhat.com/errata/RHSA-2021:3704

Open the full advisory

RHSA-2021_3703

Vulnerability from csaf_redhat - Published: 2021-09-30 16:59 - Updated: 2024-11-15 11:56

Summary

Red Hat Security Advisory: virt:av and virt-devel:av security and bug fix update

Severity

Moderate

Scope

25 vulnerabilities in this advisory, including CVE-2021-39251.

CVE-2021-39251

7.8 (High)


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

Fixed: 959 products

https://access.redhat.com/errata/RHSA-2021:3703

Open the full advisory

RHSA-2021_3704

Vulnerability from csaf_redhat - Published: 2021-09-30 19:06 - Updated: 2024-11-15 11:56

Summary

Red Hat Security Advisory: virt:8.2 and virt-devel:8.2 security update

Severity

Moderate

Scope

24 vulnerabilities in this advisory, including CVE-2021-39251.

CVE-2021-39251

7.8 (High)


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

Fixed: 920 products

https://access.redhat.com/errata/RHSA-2021:3704

Open the full advisory

RHSA-2022:1759

Vulnerability from csaf_redhat - Published: 2022-05-10 13:24 - Updated: 2026-07-05 01:24

Summary

Red Hat Security Advisory: virt:rhel and virt-devel:rhel security, bug fix, and enhancement update

Severity

Moderate

Scope

29 vulnerabilities in this advisory, including CVE-2021-39251.

CVE-2021-39251

7.8 (High)


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

Fixed: 938 products

https://access.redhat.com/errata/RHSA-2022:1759

Open the full advisory

RHSA-2022_1759

Vulnerability from csaf_redhat - Published: 2022-05-10 13:24 - Updated: 2024-11-15 14:49

Summary

Red Hat Security Advisory: virt:rhel and virt-devel:rhel security, bug fix, and enhancement update

Severity

Moderate

Scope

29 vulnerabilities in this advisory, including CVE-2021-39251.

CVE-2021-39251

7.8 (High)


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

Fixed: 940 products

https://access.redhat.com/errata/RHSA-2022:1759

Open the full advisory

SUSE-SU-2021:2965-1

Vulnerability from csaf_suse - Published: 2021-09-07 07:48 - Updated: 2021-09-07 07:48

Summary

Security update for ntfs-3g_ntfsprogs

Severity

Important

Scope

22 vulnerabilities in this advisory, including CVE-2021-39251.

CVE-2021-39251

7.8 (High)


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

Recommended: 11 products

Open the full advisory

SUSE-SU-2021:2971-1

Vulnerability from csaf_suse - Published: 2021-09-07 08:45 - Updated: 2021-09-07 08:45

Summary

Security update for ntfs-3g_ntfsprogs

Severity

Important

Scope

21 vulnerabilities in this advisory, including CVE-2021-39251.

CVE-2021-39251

7.8 (High)


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

Recommended: 8 products

Open the full advisory

UBUNTU-CVE-2021-39251 (CVE-2021-39251)

Vulnerability from osv_ubuntu – Published: 2021-09-07 15:15 – Updated: 2026-04-22 07:40 – Source website

Details

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

Severity

7.8 (High)


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

6.7 (Medium)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2021-39251	REPORT
	https://www.openwall.com/lists/oss-security/2021/…	REPORT
	https://ubuntu.com/security/notices/USN-5060-1	ADVISORY
	https://ubuntu.com/security/notices/USN-5060-2	ADVISORY
	https://www.cve.org/CVERecord?id=CVE-2021-39251	REPORT

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{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "ntfs-3g",
            "binary_version": "1:2013.1.13AR.1-2ubuntu2+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:14.04:LTS",
        "name": "ntfs-3g",
        "purl": "pkg:deb/ubuntu/ntfs-3g@1:2013.1.13AR.1-2ubuntu2+esm1?arch=source\u0026distro=trusty/esm"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:2013.1.13AR.1-2ubuntu2+esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:2013.1.13AR.1-2ubuntu1",
        "1:2013.1.13AR.1-2ubuntu2"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "ntfs-3g",
            "binary_version": "1:2015.3.14AR.1-1ubuntu0.3+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "ntfs-3g",
        "purl": "pkg:deb/ubuntu/ntfs-3g@1:2015.3.14AR.1-1ubuntu0.3+esm1?arch=source\u0026distro=esm-infra/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:2015.3.14AR.1-1ubuntu0.3+esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:2014.2.15AR.3-3",
        "1:2015.3.14AR.1-1",
        "1:2015.3.14AR.1-1build1",
        "1:2015.3.14AR.1-1ubuntu0.1",
        "1:2015.3.14AR.1-1ubuntu0.2",
        "1:2015.3.14AR.1-1ubuntu0.3"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "libntfs-3g88",
            "binary_version": "1:2017.3.23-2ubuntu0.18.04.3"
          },
          {
            "binary_name": "ntfs-3g",
            "binary_version": "1:2017.3.23-2ubuntu0.18.04.3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "ntfs-3g",
        "purl": "pkg:deb/ubuntu/ntfs-3g@1:2017.3.23-2ubuntu0.18.04.3?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:2017.3.23-2ubuntu0.18.04.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:2016.2.22AR.2-2",
        "1:2017.3.23-2",
        "1:2017.3.23-2ubuntu0.18.04.1",
        "1:2017.3.23-2ubuntu0.18.04.2"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "libntfs-3g883",
            "binary_version": "1:2017.3.23AR.3-3ubuntu1.1"
          },
          {
            "binary_name": "ntfs-3g",
            "binary_version": "1:2017.3.23AR.3-3ubuntu1.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "ntfs-3g",
        "purl": "pkg:deb/ubuntu/ntfs-3g@1:2017.3.23AR.3-3ubuntu1.1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:2017.3.23AR.3-3ubuntu1.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:2017.3.23AR.3-3ubuntu1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "libntfs-3g883",
            "binary_version": "1:2017.3.23AR.3-3ubuntu5"
          },
          {
            "binary_name": "ntfs-3g",
            "binary_version": "1:2017.3.23AR.3-3ubuntu5"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "ntfs-3g",
        "purl": "pkg:deb/ubuntu/ntfs-3g@1:2017.3.23AR.3-3ubuntu5?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:2017.3.23AR.3-3ubuntu5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": []
    }
  ],
  "aliases": [],
  "details": "A crafted NTFS image can cause a NULL pointer dereference in ntfs_extent_inode_open in NTFS-3G \u003c 2021.8.22.",
  "id": "UBUNTU-CVE-2021-39251",
  "modified": "2026-04-22T07:40:08Z",
  "published": "2021-09-07T15:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-39251"
    },
    {
      "type": "REPORT",
      "url": "https://www.openwall.com/lists/oss-security/2021/08/30/1"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-5060-1"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-5060-2"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2021-39251"
    }
  ],
  "related": [
    "USN-5060-1",
    "USN-5060-2"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2021-39251"
  ]
}

WID-SEC-W-2022-1728

Vulnerability from csaf_certbund - Published: 2021-09-30 22:00 - Updated: 2024-09-02 22:00

Summary

Red Enterprise Linux Advanced Virtualization: Mehrere Schwachstellen

Severity

Hoch

Scope

25 vulnerabilities in this advisory, including CVE-2021-39251.

CVE-2021-39251

In Red Enterprise Linux Advanced Virtualization existieren mehrere Schwachstellen in den QEMU, libvirt und ntfs-3g Komponenten. Die Ursachen sind Pufferüberläufe, Endlosschleifen, unsichere Konfigurationen und Überprüfungen und "Out of Bounds" Zugriffe. Ein entfernter oder lokaler, authentisierter Angreifer kann diese Schwachstellen ausnutzen, um einen Denial of Service zu verursachen, Sicherheitsvorkehrungen zu umgehen, beliebigen Code auszuführen und Informationen offenzulegen. Zur Ausnutzung einiger dieser Schwachstellen ist eine Benutzeraktion erforderlich.

Known affected: 6 products

Open the full advisory

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2021-39251 (GCVE-0-2021-39251)

UBUNTU-CVE-2021-39251 (CVE-2021-39251)

Tags

Sightings

Nomenclature

Related by attack behaviour