CVE-2021-31956

HIGHNVD 7.89.0▲Trending — 5 sources updated this weekExploited in the wild

7.8

Windows NTFS Elevation of Privilege Vulnerability

CVSS v3: 7.8
EG Score: 9.0(high)
EPSS: 99.5%
KEV: ⚠ Exploited

Published

June 8, 2021

Last Modified

January 13, 2026

Advisory Details (2)

Auto-updated Jun 3, 2026

⚠️ Active exploitation confirmed. Patch available. Sources: cisa, microsoft.

cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-31956

microsoft Patch Available

Security Update Guide - Microsoft Security Response Center

Security Update Guide - Microsoft Security Response Center. Patch available via Microsoft Security Update

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31956

Weakness Classification(2)

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

All Vendor Advisories

(1)

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.

Microsoft MSRCCVE-2021-319562021-06-08
Windows NTFS Elevation of Privilege Vulnerability

Data Freshness Timeline

(refreshed 20× 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.

2026-06-04 03:57 UTCEG score recompute
2026-06-04 03:57 UTCVendor advisory
2026-06-04 03:57 UTCGHSA enrichment
2026-06-03 23:44 UTCEG score recompute
2026-06-03 23:44 UTCVendor advisory
2026-06-03 23:44 UTCGHSA enrichment
2026-06-03 19:31 UTCEG score recompute
2026-06-03 19:31 UTCVendor advisory
2026-06-03 19:31 UTCGHSA enrichment
2026-06-03 19:09 UTCkev_newly_listed
2026-06-03 15:18 UTCEG score recompute
2026-06-03 15:18 UTCVendor advisory
2026-06-03 15:17 UTCGHSA enrichment
2026-06-03 11:02 UTCEG score recompute
2026-06-03 11:02 UTCVendor advisory
2026-06-03 11:02 UTCGHSA enrichment
2026-06-03 06:49 UTCEG score recompute
2026-06-03 06:49 UTCVendor advisory
2026-06-03 06:49 UTCGHSA enrichment
2026-06-03 02:36 UTCEG score recompute

Publicly available exploits

(2 references)

Working exploit code is in the public domain (2 GitHub PoCs). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

GitHub PoChoangprod/CVE-2021-31956-POC
First seen Jun 5, 2023
Open source ↗
GitHub PoCY3A/CVE-2021-31956
First seen Sep 2, 2022
Win10 20H2 LPE for CVE-2021-31956
Open source ↗

Frequently asked(6)

What is CVE-2021-31956?

CVE-2021-31956 is a high vulnerability published on June 8, 2021. Windows NTFS Elevation of Privilege Vulnerability

When was CVE-2021-31956 disclosed?

CVE-2021-31956 was first published in the National Vulnerability Database on June 8, 2021, with the most recent update on January 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-31956 actively exploited?

Yes. CISA added CVE-2021-31956 to the Known Exploited Vulnerabilities catalog on November 3, 2021, affecting Microsoft Windows. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.

What is the CVSS score of CVE-2021-31956?

CVE-2021-31956 has a CVSS v3 base score of 7.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.

Which products are affected by CVE-2021-31956?

CVE-2021-31956 affects Microsoft Windows. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.

How do I remediate CVE-2021-31956?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-31956, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2021-31956

Explore →

Is Your Infrastructure Affected by CVE-2021-31956?

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CVE-2021-31956

Published

Last Modified

Advisory Details (2)

Known Exploited Vulnerabilities Catalog | CISA

Security Update Guide - Microsoft Security Response Center

Weakness Classification(2)

All Vendor Advisories

Data Freshness Timeline

Publicly available exploits

Frequently asked(6)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-31956?

Same vendor

Same CWE

CVE-2021-31956

📅 Published

🔄 Last Modified

📋 Advisory Details (2)

Known Exploited Vulnerabilities Catalog | CISA

Security Update Guide - Microsoft Security Response Center

Weakness Classification(2)

All Vendor Advisories

Data Freshness Timeline

Publicly available exploits

❓ Frequently asked(6)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-31956?

🔗 Related CVEs(same vendor + same CWE)

Same vendor

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Published

Last Modified

Advisory Details (2)

Frequently asked(6)

Related CVEs(same vendor + same CWE)