CVE-2021-34516 : Win32k Elevation of Privilege Vulnerability

Win32k Elevation of Privilege Vulnerability

Published 2021-07-14 18:15:12

Updated 2023-12-28 23:15:39

Source Microsoft Corporation

View at NVD, CVE.org

Vulnerability category: Input validationGain privilege

Products affected by CVE-2021-34516

Microsoft » Windows Server 2008 » Version: N/A Update SP2
cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:*:*
Matching versions
Microsoft » Windows Server 2008 » Version: R2 Update SP1 For X64
cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:x64:*
Matching versions
Microsoft » Windows 7 » Version: N/A Update SP1
cpe:2.3:o:microsoft:windows_7:-:sp1:*:*:*:*:*:*
Matching versions
Microsoft » Windows Server 2012 » Version: N/A
cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*
Matching versions
Microsoft » Windows Server 2012 » Version: R2
cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*
Matching versions
Microsoft » Windows 8.1 » Version: N/A
cpe:2.3:o:microsoft:windows_8.1:-:*:*:*:*:*:*:*
Matching versions
Microsoft » Windows Rt 8.1 » Version: N/A
cpe:2.3:o:microsoft:windows_rt_8.1:-:*:*:*:*:*:*:*
Matching versions
Microsoft » Windows 10 » Version: N/A
cpe:2.3:o:microsoft:windows_10:-:*:*:*:*:*:*:*
Matching versions
Microsoft » Windows 10 » Version: 1607
cpe:2.3:o:microsoft:windows_10:1607:*:*:*:*:*:*:*
Matching versions
Microsoft » Windows 10 » Version: 1809
cpe:2.3:o:microsoft:windows_10:1809:*:*:*:*:*:*:*
Matching versions
Microsoft » Windows 10 » Version: 1909
cpe:2.3:o:microsoft:windows_10:1909:*:*:*:*:*:*:*
Matching versions
Microsoft » Windows 10 » Version: 20h2
cpe:2.3:o:microsoft:windows_10:20h2:*:*:*:*:*:*:*
Matching versions
Microsoft » Windows 10 » Version: 2004
cpe:2.3:o:microsoft:windows_10:2004:*:*:*:*:*:*:*
Matching versions
Microsoft » Windows 10 » Version: 21h1
cpe:2.3:o:microsoft:windows_10:21h1:*:*:*:*:*:*:*
Matching versions
Microsoft » Windows Server 2016 » Version: N/A
cpe:2.3:o:microsoft:windows_server_2016:-:*:*:*:*:*:*:*
Matching versions
Microsoft » Windows Server 2016 » Version: 20h2
cpe:2.3:o:microsoft:windows_server_2016:20h2:*:*:*:*:*:*:*
Matching versions
Microsoft » Windows Server 2016 » Version: 2004
cpe:2.3:o:microsoft:windows_server_2016:2004:*:*:*:*:*:*:*
Matching versions
Microsoft » Windows Server 2019 » Version: N/A
cpe:2.3:o:microsoft:windows_server_2019:-:*:*:*:*:*:*:*
Matching versions

Exploit prediction scoring system (EPSS) score for CVE-2021-34516

EPSS FAQ

0.08%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 32 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-34516

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
4.6	MEDIUM	AV:L/AC:L/Au:N/C:P/I:P/A:P	3.9	6.4	NIST
Access Vector: Local Access Complexity: Low Authentication: None Confidentiality Impact: Partial Integrity Impact: Partial Availability Impact: Partial
7.8	HIGH	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	1.8	5.9	NIST
Attack Vector: Local Attack Complexity: Low Privileges Required: Low User Interaction: None Scope: Unchanged Confidentiality: High Integrity: High Availability: High
7.8	HIGH	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	1.8	5.9	Microsoft Corporation
Attack Vector: Local Attack Complexity: Low Privileges Required: Low User Interaction: None Scope: Unchanged Confidentiality: High Integrity: High Availability: High

CWE ids for CVE-2021-34516

CWE-20 Improper Input Validation

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

Assigned by: nvd@nist.gov (Primary)

References for CVE-2021-34516

https://www.zerodayinitiative.com/advisories/ZDI-21-1006/

ZDI-21-1006 | Zero Day Initiative
Third Party Advisory;VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-21-1012/

ZDI-21-1012 | Zero Day Initiative
Third Party Advisory;VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-21-1014/

ZDI-21-1014 | Zero Day Initiative
Third Party Advisory;VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-21-1020/

ZDI-21-1020 | Zero Day Initiative
Third Party Advisory;VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-21-1017/

ZDI-21-1017 | Zero Day Initiative
Third Party Advisory;VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-21-1019/

ZDI-21-1019 | Zero Day Initiative
Third Party Advisory;VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-21-1018/

ZDI-21-1018 | Zero Day Initiative
Third Party Advisory;VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-21-1010/

ZDI-21-1010 | Zero Day Initiative
Third Party Advisory;VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-21-1004/

ZDI-21-1004 | Zero Day Initiative
Third Party Advisory;VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-21-1005/

ZDI-21-1005 | Zero Day Initiative
Third Party Advisory;VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-21-1007/

ZDI-21-1007 | Zero Day Initiative
Third Party Advisory;VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-21-1015/

ZDI-21-1015 | Zero Day Initiative
Third Party Advisory;VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-21-1016/

ZDI-21-1016 | Zero Day Initiative
Third Party Advisory;VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-21-1011/

ZDI-21-1011 | Zero Day Initiative
Third Party Advisory;VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-21-1008/

ZDI-21-1008 | Zero Day Initiative
Third Party Advisory;VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-21-1009/

ZDI-21-1009 | Zero Day Initiative
Third Party Advisory;VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-21-1021/

ZDI-21-1021 | Zero Day Initiative
Third Party Advisory;VDB Entry
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34516

CVE-2021-34516 - Security Update Guide - Microsoft - Win32k Elevation of Privilege Vulnerability
Patch;Vendor Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-1022/

ZDI-21-1022 | Zero Day Initiative
Third Party Advisory;VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-21-1013/

ZDI-21-1013 | Zero Day Initiative
Third Party Advisory;VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-21-895/

ZDI-21-895 | Zero Day Initiative
Third Party Advisory;VDB Entry

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Vulnerability Details : CVE-2021-34516

Products affected by CVE-2021-34516

Exploit prediction scoring system (EPSS) score for CVE-2021-34516

CVSS scores for CVE-2021-34516

CWE ids for CVE-2021-34516

References for CVE-2021-34516