CVE-2021-39257

MEDIUMNVD 5.55.5—

5.5

A crafted NTFS image with an unallocated bitmap can lead to a endless recursive function call chain (starting from ntfs_attr_pwrite), causing stack consumption in NTFS-3G < 2021.8.22.

CVSS v3: 5.5
EG Score: 5.5(medium)
EPSS: 36.8%
KEV: Not listed

Published

September 7, 2021

Last Modified

November 21, 2024

References (10)

cve@mitrehttps://github.com/tuxera/ntfs-3g/releases
cve@mitrehttps://github.com/tuxera/ntfs-3g/security/advisories/GHSA-q759-8j5v-q5jp
cve@mitrehttps://lists.debian.org/debian-lts-announce/2021/11/msg00013.html
cve@mitrehttps://security.gentoo.org/glsa/202301-01
cve@mitrehttps://www.debian.org/security/2021/dsa-4971
af854a3a-2127-422b-91ae-364da2661108https://github.com/tuxera/ntfs-3g/releases
af854a3a-2127-422b-91ae-364da2661108https://github.com/tuxera/ntfs-3g/security/advisories/GHSA-q759-8j5v-q5jp
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2021/11/msg00013.html
af854a3a-2127-422b-91ae-364da2661108https://security.gentoo.org/glsa/202301-01
af854a3a-2127-422b-91ae-364da2661108https://www.debian.org/security/2021/dsa-4971

Patch Availability(3)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
redhat	virt:rhel-8060020220408104655.d63f516d	2022-05-10	redhat
redhat	virt-devel:8.2-8020120210917153657.863bb0db	2021-09-30	redhat
redhat	virt-devel:av-8040020210922084349.522a0ee4	2021-09-30	redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-674Uncontrolled Recursion

All Vendor Advisories

(4)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 12× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-02 20:11 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-29 13:42 UTCepss_batch
2026-05-29 13:42 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 10:57 UTCEG score recompute
2026-05-26 10:57 UTCVendor advisory
2026-05-26 10:57 UTCGHSA enrichment
2026-05-26 07:17 UTCepss_batch

Frequently asked(5)

What is CVE-2021-39257?

CVE-2021-39257 is a medium vulnerability published on September 7, 2021. A crafted NTFS image with an unallocated bitmap can lead to a endless recursive function call chain (starting from ntfsattrpwrite), causing stack consumption in NTFS-3G < 2021.8.22.

When was CVE-2021-39257 disclosed?

CVE-2021-39257 was first published in the National Vulnerability Database on September 7, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-39257 actively exploited?

CVE-2021-39257 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 36.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-39257?

CVE-2021-39257 has a CVSS v3 base score of 5.5 (NVD).

How do I remediate CVE-2021-39257?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-39257, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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