CVE-2021-34516

Win32k Elevation of Privilege Vulnerability

Severity Score

7.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Win32k Elevation of Privilege Vulnerability

Una vulnerabilidad de Elevación de Privilegios en Win32k . Este ID de CVE es diferente de CVE-2021-34449

This vulnerability allows local attackers to escalate privileges 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 cdd.dll driver. The issue results from dereferencing a NULL pointer. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of SYSTEM.

*Credits: Marcin Wiazowski

CVSS Scores

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Local

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Local

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-06-09 CVE Reserved
2021-07-14 CVE Published
2024-08-04 CVE Updated
2024-09-30 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-20: Improper Input Validation

CAPEC

References (21)

URL	Tag	Source
https://www.zerodayinitiative.com/advisories/ZDI-21-1004	Third Party Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-1005	Third Party Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-1006	Third Party Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-1007	Third Party Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-1008	Third Party Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-1009	Third Party Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-1010	Third Party Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-1011	Third Party Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-1012	Third Party Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-1013	Third Party Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-1014	Third Party Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-1015	Third Party Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-1016	Third Party Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-1017	Third Party Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-1018	Third Party Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-1019	Third Party Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-1020	Third Party Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-1021	Third Party Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-1022	Third Party Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-895	Third Party Advisory

URL	Date	SRC

URL	Date	SRC
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34516	2023-12-28

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Microsoft Search vendor "Microsoft"		Windows 10 Search vendor "Microsoft" for product "Windows 10"				-		-		Affected
Microsoft Search vendor "Microsoft"		Windows 10 Search vendor "Microsoft" for product "Windows 10"				20h2 Search vendor "Microsoft" for product "Windows 10" and version "20h2"		-		Affected
Microsoft Search vendor "Microsoft"		Windows 10 Search vendor "Microsoft" for product "Windows 10"				21h1 Search vendor "Microsoft" for product "Windows 10" and version "21h1"		-		Affected
Microsoft Search vendor "Microsoft"		Windows 10 Search vendor "Microsoft" for product "Windows 10"				1607 Search vendor "Microsoft" for product "Windows 10" and version "1607"		-		Affected
Microsoft Search vendor "Microsoft"		Windows 10 Search vendor "Microsoft" for product "Windows 10"				1809 Search vendor "Microsoft" for product "Windows 10" and version "1809"		-		Affected
Microsoft Search vendor "Microsoft"		Windows 10 Search vendor "Microsoft" for product "Windows 10"				1909 Search vendor "Microsoft" for product "Windows 10" and version "1909"		-		Affected
Microsoft Search vendor "Microsoft"		Windows 10 Search vendor "Microsoft" for product "Windows 10"				2004 Search vendor "Microsoft" for product "Windows 10" and version "2004"		-		Affected
Microsoft Search vendor "Microsoft"		Windows 7 Search vendor "Microsoft" for product "Windows 7"				-		sp1		Affected
Microsoft Search vendor "Microsoft"		Windows 8.1 Search vendor "Microsoft" for product "Windows 8.1"				-		-		Affected
Microsoft Search vendor "Microsoft"		Windows Rt 8.1 Search vendor "Microsoft" for product "Windows Rt 8.1"				-		-		Affected
Microsoft Search vendor "Microsoft"		Windows Server 2008 Search vendor "Microsoft" for product "Windows Server 2008"				-		sp2		Affected
Microsoft Search vendor "Microsoft"		Windows Server 2008 Search vendor "Microsoft" for product "Windows Server 2008"				r2 Search vendor "Microsoft" for product "Windows Server 2008" and version "r2"		sp1, x64		Affected
Microsoft Search vendor "Microsoft"		Windows Server 2012 Search vendor "Microsoft" for product "Windows Server 2012"				-		-		Affected
Microsoft Search vendor "Microsoft"		Windows Server 2012 Search vendor "Microsoft" for product "Windows Server 2012"				r2 Search vendor "Microsoft" for product "Windows Server 2012" and version "r2"		-		Affected
Microsoft Search vendor "Microsoft"		Windows Server 2016 Search vendor "Microsoft" for product "Windows Server 2016"				-		-		Affected
Microsoft Search vendor "Microsoft"		Windows Server 2016 Search vendor "Microsoft" for product "Windows Server 2016"				20h2 Search vendor "Microsoft" for product "Windows Server 2016" and version "20h2"		-		Affected
Microsoft Search vendor "Microsoft"		Windows Server 2016 Search vendor "Microsoft" for product "Windows Server 2016"				2004 Search vendor "Microsoft" for product "Windows Server 2016" and version "2004"		-		Affected
Microsoft Search vendor "Microsoft"		Windows Server 2019 Search vendor "Microsoft" for product "Windows Server 2019"				-		-		Affected