CVE-2021-31956
Exploited in the Wild
✓ Confirmed 0-Day
★ Google Project Zero
Triaged: March 5, 2026
4 articles
Published: 2021-06-08
EPSS Score
Source: FIRST.org · 2026-05-24
90.72%
probability
This CVE has a 90.72% probability
of being exploited in the next 30 days.
0%
Top 99.6th percentile of all CVEs
100%
CVSS v3.1
Source: VulnerabilityLookup (CIRCL)7.8
HIGH
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Temporal
Exploit Code Maturity
Functional
Remediation Level
Official Fix
Report Confidence
Confirmed
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C
Description
Project ZeroHeap-based buffer overflow in ntfs.sys
Affected Products
Microsoft
Windows 10 Version 1809
10.0.0
Microsoft
Windows Server 2019
10.0.0
Microsoft
Windows Server 2019 (Server Core installation)
10.0.0
Microsoft
Windows 10 Version 1909
10.0.0
Microsoft
Windows 10 Version 21H1
10.0.0
Google Project Zero
Discovered
April 14, 2021
Patched
June 8, 2021
Reported by
Boris Larin (Oct0xor) of Kaspersky Lab
Root Cause Analysis
???
Exploits & PoC
hzshang/CVE-2021-31956
PoC CVE-2021-31956 — hzshang/CVE-2021-31956
0
deletehead/Pool-Overflow-CVE-2021-31956
Kernel Pool Overflow Exploit targeting CVE-2021-31956
0
2 repos — triés par ⭐
Rechercher sur GitHub ↗
Signal Intelligence
Confidence
95%
EPSS
90.72%
CVSS v3.1
7.8
Mentions
4
Last Seen
Nov 09, 2021
CNA Information
CNA Assigner
microsoft
CNA Title
Windows NTFS Elevation of Privilege Vulnerability
Analyst Note
Auto-imported from Google Project Zero — confirmed zero-day by definition.
Triage Info
Decided atMar 05, 2026
Published DateJun 08, 2021