CVE-2021-39256
HIGHCVSS 7.8/10EPSS 0.43%
Last modified
CVE-2021-39256 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. A crafted NTFS image can cause a heap-based buffer overflow in ntfs_inode_lookup_by_name in NTFS-3G < 2021.8.22.. EPSS estimates a 0.43% chance of exploitation in the next 30 days.
Description
A crafted NTFS image can cause a heap-based buffer overflow in ntfs_inode_lookup_by_name in NTFS-3G < 2021.8.22.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Tuxera | Ntfs-3g | < 2021.8.22 |
| Debian | Debian Linux | 9.0 |
| Debian | Debian Linux | 10.0 |
| Debian | Debian Linux | 11.0 |
References
- https://github.com/tuxera/ntfs-3g/releasesRelease Notes, Third Party Advisory
- https://github.com/tuxera/ntfs-3g/security/advisories/GHSA-q759-8j5v-q5jpThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/11/msg00013.htmlMailing List, Third Party Advisory
- https://security.gentoo.org/glsa/202301-01Third Party Advisory
- https://www.debian.org/security/2021/dsa-4971Third Party Advisory
- https://github.com/tuxera/ntfs-3g/releasesRelease Notes, Third Party Advisory
- https://github.com/tuxera/ntfs-3g/security/advisories/GHSA-q759-8j5v-q5jpThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/11/msg00013.htmlMailing List, Third Party Advisory
- https://security.gentoo.org/glsa/202301-01Third Party Advisory
- https://www.debian.org/security/2021/dsa-4971Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-39256?
A crafted NTFS image can cause a heap-based buffer overflow in ntfs_inode_lookup_by_name in NTFS-3G < 2021.8.22.
How severe is CVE-2021-39256?
CVE-2021-39256 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.43% probability of exploitation in the next 30 days.
How do I fix CVE-2021-39256?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-39256?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST