VDB-182144 · CVE-2021-39251 · EUVD-2021-25613

Tuxera ntfs-3g prior 2021.8.22 NTFS Image ntfs_extent_inode_open null pointer dereference

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
4.8	$0-$5k	0.00

Summaryinfo

A vulnerability was found in Tuxera ntfs-3g and classified as problematic. The affected element is the function ntfs_extent_inode_open of the component NTFS Image Handler. Such manipulation leads to null pointer dereference. This vulnerability is traded as CVE-2021-39251. The attack can be executed directly on the physical device. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Tuxera ntfs-3g. Affected by this issue is the function ntfs_extent_inode_open of the component NTFS Image Handler. The manipulation with an unknown input leads to a null pointer dereference vulnerability. Using CWE to declare the problem leads to CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. Impacted is availability.

The weakness was shared 09/08/2021. The advisory is shared for download at github.com. This vulnerability is handled as CVE-2021-39251. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 299967 (Oracle Linux 8 : virt:kvm_utils3 (ELSA-2026-50118)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 2021.8.22 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (299967) and EUVD (EUVD-2021-25613). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Vendor

Tuxera

Name

ntfs-3g

License

open-source

Website

Product: https://github.com/tuxera/ntfs-3g/

CPE 2.3info

🔍

CPE 2.2info

🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.8
VulDB Meta Temp Score: 4.8

VulDB Base Score: 1.9
VulDB Temp Score: 1.9
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
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Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: Yes
Local: Yes
Remote: Partially

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 299967
Nessus Name: Oracle Linux 8 : virt:kvm_utils3 (ELSA-2026-50118)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: ntfs-3g 2021.8.22

Timelineinfo

08/17/2021 🔍
09/08/2021 +22 days 🔍
09/08/2021 +0 days 🔍
03/01/2026 +1635 days 🔍

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Confirmed

CVE: CVE-2021-39251 (🔍)
GCVE (CVE): GCVE-0-2021-39251
GCVE (VulDB): GCVE-100-182144
EUVD: 🔍

Entryinfo

Created: 09/08/2021 08:12
Updated: 03/01/2026 22:24
Changes: 09/08/2021 08:12 (58), 09/10/2021 14:24 (2), 12/02/2025 23:27 (33), 12/03/2025 14:53 (1), 03/01/2026 22:24 (2)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.