CVE-2021-31955

ENISA EUVD: EUVD-2021-18828 ↗
Exploited in the Wild ✓ Confirmed 0-Day ★ Google Project Zero
Triaged: March 5, 2026 4 articles Published: 2021-06-08
VulnLookup ↗ NVD ↗ EUVD ↗ MITRE ↗ Advisory ↗ P0 Sheet ↗ CISA KEV ↗

EPSS Score

Source: FIRST.org · 2026-05-23
3.61%
probability
This CVE has a 3.61% probability of being exploited in the next 30 days.
0% Top 87.9th percentile of all CVEs 100%

CVSS v3.1

Source: VulnerabilityLookup (CIRCL)
5.5
MEDIUM
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None
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:N/A:N/E:F/RL:O/RC:C

CVSS v2 (legacy)

2.1
LOW
Access Vector
Local
Access Complexity
Low
Authentication
None
Confidentiality
Partial
Integrity
None
Availability
None
AV:L/AC:L/Au:N/C:P/I:N/A:N

Description

NVD
Windows Kernel Information Disclosure Vulnerability

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

Attack Intelligence

Google Project Zero

Discovered
April 14, 2021
Patched
June 8, 2021
Reported by
Boris Larin (Oct0xor) of Kaspersky Lab
Root Cause Analysis
???

Exploits & PoC

freeide/CVE-2021-31955-POC
13 2021-06-26
ApexPredator-InfoSec/forti_shield

A combined POC for CVE-2021-31955, CVE-2015-4077, and CVE-2015-5736

2 2025-12-04
2 repos — triés par ⭐ Rechercher sur GitHub ↗

Signal Intelligence

Confidenceⓘ
95%
EPSS 3.61%
CVSS v3.1 5.5
Mentions 4
Last Seen Nov 09, 2021

CNA Information

CNA Assigner
microsoft
CNA Title
Windows Kernel Information Disclosure Vulnerability

Analyst Note

Auto-imported from Google Project Zero — confirmed zero-day by definition.

Triage Info

Decided atMar 05, 2026
Published DateJun 08, 2021