CVE-2021-39254: debian debian_linux Integer Overflow or Wraparound
Vulnerability summary
CVE-2021-39254 is a high (CVSS 7.8) Integer Overflow or Wraparound vulnerability in debian debian_linux. EPSS estimates a 0.44% chance of exploitation in the next 30 days, higher than 37.9% of scored vulnerabilities.
Not severe (CVSS 6.7, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 6 · Related 2Timeline
- 07-09-2021PublishedVulnerability first disclosed.
- 02-12-2025Last modifiedVulnerability information updated.
Description
A crafted NTFS image can cause an integer overflow in memmove, leading to a heap-based buffer overflow in the function ntfs_attr_record_resize, in NTFS-3G < 2021.8.22.
CVSS metrics
5 scores · 4 sources · 2 versions- CVE.orgCNA6.7MediumCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:HDiffers
- OSV · UbuntuEcosystem advisory · calculated6.7MediumCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:HDiffers
- OSV · DebianEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.44%
Chance of exploitation in the next 30 days
Percentile
38%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.44% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-190Integer Overflow or WraparoundThe product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.
- CWE-20Improper Input ValidationThe product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
Affected systems
Known conditions: local access, administrative account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Debian2 products
- ntfs-3g< 1:2021.8.22-2
- debian_linuxEOL9.0 | 10.0 | 11.0
Fedoraproject1 product
- fedoraEOL33 | 35
Tuxera1 product
- ntfs-3g< 2021.8.22
Ubuntu1 product
- ntfs-3g< 1:2013.1.13AR.1-2ubuntu2+esm1 | < 1:2015.3.14AR.1-1ubuntu0.3+esm1 | < 1:2017.3.23-2ubuntu0.18.04.3 | < 1:2017.3.23AR.3-3ubuntu1.1 | < 1:2017.3.23AR.3-3ubuntu5
4 vendors · 5 products
References
14 links- github.com/tuxera/ntfs-3g/security/advisories/GHSA-q759-8j5v-q5jpThird Party Advisory
- lists.fedoraproject.org/archives/…Vendor Advisory
- lists.fedoraproject.org/archives/…Vendor Advisory
