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CVE-2021-39261· NVD / CVE Program· CNA mitre

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

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
Sep 7, 2021
Updated
Jun 17, 2026
EPSS
0.5% · 37th percentile
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Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.5%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

Affected systems

VendorProduct
tuxerantfs-3g
debiandebian linux

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • debian debian linux10.0
  • debian debian linux11.0
  • debian debian linux9.0
  • tuxera ntfs-3gbefore 2021.8.22

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:10ntfs-3gbefore 1:2017.3.23AR.3-3+deb10u11:2017.3.23AR.3-3+deb10u1
Debian:11ntfs-3gbefore 1:2017.3.23AR.3-4+deb11u11:2017.3.23AR.3-4+deb11u1
Debian:12ntfs-3gbefore 1:2021.8.22-21:2021.8.22-2
Debian:9ntfs-3gbefore 1:2016.2.22AR.1+dfsg-1+deb9u21:2016.2.22AR.1+dfsg-1+deb9u2
openSUSE:Leap 15.2ntfs-3g_ntfsprogsbefore 2021.8.22-lp152.5.3.12021.8.22-lp152.5.3.1
openSUSE:Leap 15.3ntfs-3g_ntfsprogsbefore 2021.8.22-3.8.12021.8.22-3.8.1
SUSE:Linux Enterprise Software Development Kit 12 SP5ntfs-3g_ntfsprogsbefore 2021.8.22-5.9.12021.8.22-5.9.1
SUSE:Linux Enterprise Workstation Extension 15 SP2ntfs-3g_ntfsprogsbefore 2021.8.22-3.8.12021.8.22-3.8.1

Same product

tuxera: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-40706In NTFS-3G 2022.10.3 before 2026.2.25, a heap buffer overflow exists in ntfs_build_permissions_posix() in acls.c that allows an attacker to
    33Monitor
  • CVE-2017-0358ntfs-3g: Modprobe influence vulnerability via environment variables
    32Monitor
  • CVE-2022-40284A buffer overflow was discovered in NTFS-3G before 2022.10.3.
    31Monitor
  • CVE-2022-30789A crafted NTFS image can cause a heap-based buffer overflow in ntfs_check_log_client_array in NTFS-3G through 2021.8.22.
    31Monitor
  • CVE-2022-30788A crafted NTFS image can cause a heap-based buffer overflow in ntfs_mft_rec_alloc in NTFS-3G through 2021.8.22.
    31Monitor
  • CVE-2022-30786A crafted NTFS image can cause a heap-based buffer overflow in ntfs_names_full_collate in NTFS-3G through 2021.8.22.
    31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:ntfs-3g1:2021.8.22-2 · Debian:12Package registry (OSV)
opensuse:ntfs-3g_ntfsprogs2021.8.22-lp152.5.3.1 · openSUSE:Leap 15.2Package registry (OSV)
suse:ntfs-3g_ntfsprogs2021.8.22-5.9.1 · SUSE:Linux Enterprise Software Development Kit 12 SP5Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-787 · Out-of-bounds Write

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

We use this product, ask for help

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records