CVE Watch—

CVE-2021-31956

Microsoft Windows NTFS Privilege Escalation Vulnerability

CVSS

—

No CVSS

EPSS

22.3%

p98

KEV

YES

Nov 3, 2021

Exploit Today

0-100

Published: — · Last modified: —

EPSS · 30d

22.3%EPSS · 30 days22.3%

2026-09-162026-10-14

KEV catalog record

Product

Microsoft / Windows

Vulnerability

Microsoft Windows NTFS Privilege Escalation Vulnerability

Added to KEV

Nov 3, 2021

Remediate by

Nov 17, 2021

Known ransomware use

Summary description

Microsoft Windows New Technology File System (NTFS) contains an unspecified vulnerability that allows attackers to escalate privileges via a specially crafted application.

Required action

Apply updates per vendor instructions.

Notes

https://nvd.nist.gov/vuln/detail/CVE-2021-31956

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