What’s Vulnerable › Vulnerabilities

CVE-2021-39251

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-09-07 · updated 2026-06-17
• Weakness: CWE-476

Description

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

Affected products

• Debian Linux: 9.0, 10.0, 11.0
• Fedoraproject Fedora: 33, 35
• Red Hat Enterprise Linux: 7.0, 8.0
• Tuxera NTFS-3G: before 2021.8.22 — fixed in 2021.8.22

How to fix

Upgrade to a fixed version: Tuxera NTFS-3G 2021.8.22. Check the vendor advisory for mitigations.

References

• http://www.openwall.com/lists/oss-security/2021/08/30/1
• https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=988386
• https://bugzilla.redhat.com/show_bug.cgi?id=2001649
• https://github.com/tuxera/ntfs-3g/releases
• https://github.com/tuxera/ntfs-3g/security/advisories/GHSA-q759-8j5v-q5jp
• https://lists.debian.org/debian-lts-announce/2021/11/msg00013.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/766ISTT3KCARKFUIQT7N6WV6T63XOKG3/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HSEKTKHO5HFZHWZNJNBJZA56472KRUZI/
• https://security.gentoo.org/glsa/202301-01
• https://www.debian.org/security/2021/dsa-4971
• http://www.openwall.com/lists/oss-security/2021/08/30/1
• https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=988386

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