Jun 2021: Windows NTFS Elevation of Privilege Vulnerability
CVE-2021-31956 Published on June 8, 2021

Windows NTFS Elevation of Privilege Vulnerability
Windows NTFS Elevation of Privilege Vulnerability

NVD

Known Exploited Vulnerability

This Microsoft Windows NTFS Privilege Escalation Vulnerability is part of CISA's list of Known Exploited Vulnerabilities. Windows NTFS Privilege Escalation Vulnerability.

The following remediation steps are recommended / required by November 17, 2021: Apply updates per vendor instructions.

Weakness Type

What is an Integer underflow Vulnerability?

The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result. This can happen in signed and unsigned cases.

CVE-2021-31956 has been classified to as an Integer underflow vulnerability or weakness.

Products Associated with CVE-2021-31956

You can be notified by email with stack.watch whenever vulnerabilities like CVE-2021-31956 are published in these products:

Microsoft Windows 10

Microsoft Windows 7

Microsoft Windows 8.1

Microsoft Windows Rt 8 1

Microsoft Windows Server 2008

Microsoft Windows Server 2012

Microsoft Windows Server 2016

Microsoft Windows Server 2019

Microsoft Windows 10 1909

Microsoft Windows 10 21h1

Microsoft Windows 10 2004

Microsoft Windows Server 2004

Microsoft Windows 10 1507

Microsoft Windows Server 20h2

Microsoft Windows Server 2008 Sp2

Microsoft Windows Server 2008 R2

Microsoft Windows Server 2012 R2

Affected Versions

Microsoft Windows 10 Version 1809:

Version 10.0.0 and below 10.0.17763.1999 is affected.

Microsoft Windows Server 2019:

Version 10.0.0 and below 10.0.17763.1999 is affected.

Microsoft Windows Server 2019 (Server Core installation):

Version 10.0.0 and below 10.0.17763.1999 is affected.

Microsoft Windows 10 Version 1909:

Version 10.0.0 and below 10.0.18363.1621 is affected.

Microsoft Windows 10 Version 21H1:

Version 10.0.0 and below 10.0.19043.1052 is affected.

Microsoft Windows 10 Version 2004:

Version 10.0.0 and below 10.0.19041.1052 is affected.

Microsoft Windows Server version 2004:

Version 10.0.0 and below 10.0.19041.1052 is affected.

Microsoft Windows 10 Version 20H2:

Version 10.0.0 and below 10.0.19042.1052 is affected.

Microsoft Windows Server version 20H2:

Version 10.0.0 and below 10.0.19042.1052 is affected.

Microsoft Windows 10 Version 1507:

Version 10.0.0 and below 10.0.10240.18967 is affected.

Microsoft Windows 10 Version 1607:

Version 10.0.0 and below 10.0.14393.4467 is affected.

Microsoft Windows Server 2016:

Version 10.0.0 and below 10.0.14393.4467 is affected.

Microsoft Windows Server 2016 (Server Core installation):

Version 10.0.0 and below 10.0.14393.4467 is affected.

Microsoft Windows 7:

Version 6.1.0 and below 6.1.7601.25632 is affected.

Microsoft Windows 7 Service Pack 1:

Version 6.1.0 and below 6.1.7601.25632 is affected.

Microsoft Windows 8.1:

Version 6.3.0 and below 6.3.9600.20045 is affected.
Version 6.3.0 and below 6.3.9600.20044 is affected.

Microsoft Windows Server 2008 Service Pack 2:

Version 6.0.0 and below 6.0.6003.21137 is affected.

Microsoft Windows Server 2008 Service Pack 2 (Server Core installation):

Version 6.0.0 and below 6.0.6003.21137 is affected.

Microsoft Windows Server 2008 Service Pack 2:

Version 6.0.0 and below 6.0.6003.21137 is affected.

Microsoft Windows Server 2008 R2 Service Pack 1:

Version 6.1.0 and below 6.1.7601.25632 is affected.

Microsoft Windows Server 2008 R2 Service Pack 1 (Server Core installation):

Version 6.0.0 and below 6.1.7601.25632 is affected.

Microsoft Windows Server 2012:

Version 6.2.0 and below 6.2.9200.23372 is affected.

Microsoft Windows Server 2012 (Server Core installation):

Version 6.2.0 and below 6.2.9200.23372 is affected.

Microsoft Windows Server 2012 R2:

Version 6.3.0 and below 6.3.9600.20045 is affected.
Version 6.3.0 and below 6.3.9600.20044 is affected.

Microsoft Windows Server 2012 R2 (Server Core installation):

Version 6.3.0 and below 6.3.9600.20045 is affected.
Version 6.3.0 and below 6.3.9600.20044 is affected.

Exploit Probability

EPSS

88.71%

Percentile

99.50%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.