CVE-2021-39258

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2022-05-24. NVD baseline CVSS 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
7.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.8Exploit: NoneExposed: 0

A fix is available — apply it.

A crafted NTFS image can cause out-of-bounds reads in ntfs_attr_find and ntfs_external_attr_find in NTFS-3G < 2021.8.22.

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
—
EPSS
34.4%
KEV
Not listed

Published

September 7, 2021

Last Modified

December 2, 2025

References (10)

Vendor Advisories for CVE-2021-39258(3)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(3)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatvirt:rhel-8060020220408104655.d63f516d2022-05-10redhat
redhatvirt-devel:8.2-8020120210917153657.863bb0db2021-09-30redhat
redhatvirt-devel:av-8040020210922084349.522a0ee42021-09-30redhat

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(2)

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

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 12× in last 7d / 49× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 106 total refreshes for this CVE.

  1. 2026-07-22 22:50 UTCEG score recompute
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  75. 2026-05-26 10:57 UTCEG score recompute

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Frequently asked(5)

What is CVE-2021-39258?
CVE-2021-39258 is a high vulnerability published on September 7, 2021. A crafted NTFS image can cause out-of-bounds reads in ntfsattrfind and ntfsexternalattr_find in NTFS-3G < 2021.8.22.
When was CVE-2021-39258 disclosed?
CVE-2021-39258 was first published in the National Vulnerability Database on September 7, 2021, with the most recent update on December 2, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-39258 actively exploited?
CVE-2021-39258 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 34.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-39258?
CVE-2021-39258 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2021-39258?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-39258, 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.

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