CVE-2021-31188: Microsoft Windows win32kfull Font Entry Use-After-Free Information Disclosure Vulnerability
First published: Tue May 11 2021(Updated: )
This vulnerability allows local attackers to disclose sensitive information on affected installations of Microsoft Windows. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists within the handling of Font Entry objects. The issue results from the lack of validating the existence of an object prior to performing operations on the object. An attacker can leverage this in conjunction with other vulnerabilities to escalate privileges and execute arbitrary code in the context of SYSTEM.
Credit: secure@microsoft.com secure@microsoft.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Microsoft Windows 10 | =20H2 | |
| Microsoft Windows | ||
| Microsoft Windows Server 2008 R2 | ||
| Microsoft Windows 10 | =1803 | |
| Microsoft Windows 10 | =20H2 | |
| Microsoft Windows Server | =20H2 | |
| Microsoft Windows Server | =2004 | |
| Microsoft Windows Server 2012 R2 | ||
| Microsoft Windows 8.1 for x64-based systems | ||
| Microsoft Windows 8.1 for 32-bit systems | ||
| Microsoft Windows Server 2019 | ||
| Microsoft Windows 10 | =1803 | |
| Microsoft Windows 10 | =2004 | |
| Microsoft Windows 10 | =1809 | |
| Microsoft Windows 10 | =1909 | |
| Microsoft Windows 10 | =1607 | |
| Microsoft Windows 10 | =20H2 | |
| Microsoft Windows Server 2016 | ||
| Microsoft Windows Server 2008 R2 | ||
| Microsoft Windows Server 2016 | ||
| Microsoft Windows 10 | =1607 | |
| Microsoft Windows 10 | ||
| Microsoft Windows 10 | ||
| Microsoft Windows Server 2019 | ||
| Microsoft Windows Server | =1909 | |
| Microsoft Windows 10 | =1803 | |
| Microsoft Windows 7 | ||
| Microsoft Windows Server 2012 R2 | ||
| Microsoft Windows 10 | =1909 | |
| Microsoft Windows 10 | =2004 | |
| Microsoft Windows 10 | =1809 | |
| Microsoft Windows 10 | =1909 | |
| Microsoft Windows 10 | =2004 | |
| Microsoft Windows 7 | ||
| Microsoft Windows 10 | =1809 | |
| Microsoft Windows Server 2012 x64 | ||
| Microsoft Windows Server 2012 x64 | ||
| Microsoft Windows RT | ||
| Microsoft Windows Server 2008 Itanium | ||
| Microsoft Windows Server 2008 Itanium | ||
| Microsoft Windows 10 | ||
| Microsoft Windows 10 | =20h2 | |
| Microsoft Windows 10 | =1607 | |
| Microsoft Windows 10 | =1803 | |
| Microsoft Windows 10 | =1809 | |
| Microsoft Windows 10 | =1909 | |
| Microsoft Windows 10 | =2004 | |
| Microsoft Windows 7 | =sp1 | |
| Microsoft Windows 8.1 | ||
| Microsoft Windows RT | ||
| Microsoft Windows Server 2008 Itanium | =sp2 | |
| Microsoft Windows Server 2008 Itanium | =r2-sp1 | |
| Microsoft Windows Server 2012 x64 | ||
| Microsoft Windows Server 2012 x64 | =r2 | |
| Microsoft Windows Server 2016 | ||
| Microsoft Windows Server 2016 | =20h2 | |
| Microsoft Windows Server 2016 | =1909 | |
| Microsoft Windows Server 2016 | =2004 | |
| Microsoft Windows Server 2019 | ||
| Microsoft Windows Server 2008 Itanium | ||
| Microsoft Windows Server 2008 Itanium |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2021-31188?
CVE-2021-31188 has been classified with a severity rating that indicates it can lead to sensitive information disclosure by local attackers.
How do I fix CVE-2021-31188?
To fix CVE-2021-31188, apply the relevant security patches provided by Microsoft for your specific version of Windows.
Which versions of Windows are affected by CVE-2021-31188?
CVE-2021-31188 affects multiple versions of Windows including Windows 10, Windows Server 2008 R2, and others.
Who can exploit CVE-2021-31188?
CVE-2021-31188 can be exploited by local attackers who have the ability to execute low-privileged code on the target system.
What type of vulnerability is CVE-2021-31188?
CVE-2021-31188 is a vulnerability that allows local attackers to disclose sensitive information on affected installations of Microsoft Windows.
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- alias/ZDI-21-577
- alias/ZDI-CAN-13320
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- source/Microsoft
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- vendor/microsoft
- canonical/microsoft windows 10
- version/microsoft windows 10/20h2
- canonical/microsoft windows
- canonical/microsoft windows server 2008 r2
- version/microsoft windows 10/1803
- canonical/microsoft windows server
- version/microsoft windows server/20h2
- version/microsoft windows server/2004
- canonical/microsoft windows server 2012 r2
- canonical/microsoft windows 8.1 for x64-based systems
- canonical/microsoft windows 8.1 for 32-bit systems
- canonical/microsoft windows server 2019
- version/microsoft windows 10/2004
- version/microsoft windows 10/1809
- version/microsoft windows 10/1909
- version/microsoft windows 10/1607
- canonical/microsoft windows server 2016
- version/microsoft windows server/1909
- canonical/microsoft windows 7
- canonical/microsoft windows server 2012 x64
- canonical/microsoft windows rt
- canonical/microsoft windows server 2008 itanium
- version/microsoft windows 7/sp1
- canonical/microsoft windows 8.1
- version/microsoft windows server 2008 itanium/sp2
- version/microsoft windows server 2008 itanium/r2-sp1
- version/microsoft windows server 2012 x64/r2
- version/microsoft windows server 2016/20h2
- version/microsoft windows server 2016/1909
- version/microsoft windows server 2016/2004