Security readout for executives and security teams
CVE-2021-39251 affects NTFS-3G before 2021.8.22. A maliciously crafted NTFS disk image can trigger a NULL pointer dereference when processed. Business risk is mainly where servers, workstations, or forensic pipelines mount untrusted NTFS media or images. Exposure is most likely on systems running NTFS-3G before 2021.8.22 that mount NTFS filesystems from removable drives, disk images, or user-supplied media. Treat as a targeted operational risk, not an emergency internet exposure. Prioritize patching on systems handling external drives, forensic images, customer uploads, or administrator-mounted NTFS media. Mitigation focus: Upgrade NTFS-3G to 2021.8.22 or a fixed distribution package.; Apply relevant Debian, Fedora, Gentoo, or vendor security updates.; Restrict mounting of untrusted NTFS images or removable media..
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
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ATT&CK lookup starting points
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CWE-20: Exact CWE lookup
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Open ATT&CK lookupCWE-476: Exact CWE lookup
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Open ATT&CK lookupCVE-2021-39251 mapping review
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Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.7 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H0.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.7MediumVector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/tuxera/ntfs-3g/releasesCVE reference
- https://github.com/tuxera/ntfs-3g/security/advisories/GHSA-q759-8j5v-q5jpCVE reference
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=988386CVE reference
- https://bugzilla.redhat.com/show_bug.cgi?id=2001649CVE reference
- DSA-4971CVE reference · vendor-advisory
- FEDORA-2021-e7c8ba6301CVE reference · vendor-advisory
- FEDORA-2021-5b1dac797bCVE reference · vendor-advisory
- [debian-lts-announce] 20211116 [SECURITY] [DLA 2819-1] ntfs-3g security updateCVE reference · mailing-list
- GLSA-202301-01CVE reference · vendor-advisory
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Input Validation
Improper Input Validation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.
NULL Pointer Dereference
NULL Pointer Dereference represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.