Win32k Elevation of Privilege Vulnerability
Published 2021-10-13 01:15:10
Updated 2023-08-01 23:15:17
View at NVD,   CVE.org
Vulnerability category: Gain privilege

CVE-2021-40449 is in the CISA Known Exploited Vulnerabilities Catalog

This issue is known to have been leveraged as part of a ransomware campaign.
CISA vulnerability name:
Microsoft Windows Win32k Privilege Escalation Vulnerability
CISA required action:
Apply updates per vendor instructions.
CISA description:
Unspecified vulnerability allows for an authenticated user to escalate privileges.
Added on 2021-11-17 Action due date 2021-12-01

Exploit prediction scoring system (EPSS) score for CVE-2021-40449

0.10%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 42 %
Percentile, the proportion of vulnerabilities that are scored at or less

Metasploit modules for CVE-2021-40449

  • Win32k NtGdiResetDC Use After Free Local Privilege Elevation
    Disclosure Date: 2021-10-12
    First seen: 2022-12-23
    exploit/windows/local/cve_2021_40449
    A use after free vulnerability exists in the `NtGdiResetDC()` function of Win32k which can be leveraged by an attacker to escalate privileges to those of `NT AUTHORITY\SYSTEM`. The flaw exists due to the fact that this function calls `hdcOpenDCW()`, which perform

CVSS scores for CVE-2021-40449

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
4.6
MEDIUM AV:L/AC:L/Au:N/C:P/I:P/A:P
3.9
6.4
NIST
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
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

CWE ids for CVE-2021-40449

  • The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor.
    Assigned by: nvd@nist.gov (Primary)

References for CVE-2021-40449

Products affected by CVE-2021-40449

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