What’s Vulnerable › Vulnerabilities

CVE-2021-39256

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% 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-787

Description

A crafted NTFS image can cause a heap-based buffer overflow in ntfs_inode_lookup_by_name in NTFS-3G < 2021.8.22.

Affected products

• Debian Linux: 9.0, 10.0, 11.0
• 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

• 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://security.gentoo.org/glsa/202301-01
• https://www.debian.org/security/2021/dsa-4971
• 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://security.gentoo.org/glsa/202301-01
• https://www.debian.org/security/2021/dsa-4971

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