CVE-2021-39256

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.46% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 37.6% of scored records. A rank, not a probability.

NVD base score

7.8 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2021-09-07 00:00Z4 YR AGO

Last updated

2025-12-02 21:18Z9 MO AGO

Reserved

2021-08-17

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Medium (CVSS 6.7)

CNA CVSS vector

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

Weaknesses

• CWE-20Improper Input ValidationClass
• CWE-787Out-of-bounds WriteBase
• CWE-119Improper Restriction of Operations within the Bounds of a Memory BufferClass

Data version

5.2

Document digest

a76989ba6b7ebcbf12e3d4dfd53ff0741c5ee3ae22ce612f516c05e16f056859

• github.comhttps://github.com/tuxera/ntfs-3g/releases
• github.comhttps://github.com/tuxera/ntfs-3g/security/advisories/GHSA-q759-8j5v-q5jp
• www.debian.orgDSA-4971https://www.debian.org/security/2021/dsa-4971vendor-advisory
• lists.debian.org[debian-lts-announce] 20211116 [SECURITY] [DLA 2819-1] ntfs-3g security updatehttps://lists.debian.org/debian-lts-announce/2021/11/msg00013.htmlmailing-list
• security.gentoo.orgGLSA-202301-01https://security.gentoo.org/glsa/202301-01vendor-advisory