CVE-2021-40449

Highest-risk unexploited with PoCs

Exploit code exists, no confirmed in-the-wild activity, ranked by EPSS

Actively Exploited

Confirmed exploited in the wild, sorted by most recently updated

CVSS 7.8EPSS 82%

Published 2021-10-13Updated 2026-04-08

Exploited in the wild

Vulnerability details

Win32k Elevation of Privilege Vulnerability

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C

CNAmicrosoft

EPSS score history

Sources

4 links

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CISA Known Exploited CVE Organization Bleeping Computer The Hacker News

Profile

CVSS

7.8

EPSS

82%

Published

2021-10-13

Updated

2026-04-08

CNA

microsoft

Vendors

No vendors listed.

CPEs

cpe:2.3:o:microsoft:windows_10_1809:10.0.17763.2237:*:*:*:*:*:x86:*

cpe:2.3:o:microsoft:windows_10_1809:10.0.17763.2237:*:*:*:*:*:x64:*

cpe:2.3:o:microsoft:windows_10_1809:10.0.17763.2237:*:*:*:*:*:arm64:*

cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.2237:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_10_1909:10.0.18363.1854:*:*:*:*:*:x86:*

cpe:2.3:o:microsoft:windows_10_1909:10.0.18363.1854:*:*:*:*:*:x64:*

cpe:2.3:o:microsoft:windows_10_1809:10.0.18363.1854:*:*:*:*:*:x64:*

cpe:2.3:o:microsoft:windows_10_21H1:10.0.19041.1288:*:*:*:*:*:x64:*

cpe:2.3:o:microsoft:windows_10_21H1:10.0.19041.1288:*:*:*:*:*:arm64:*

cpe:2.3:o:microsoft:windows_10_21H1:10.0.19041.1288:*:*:*:*:*:x86:*

cpe:2.3:o:microsoft:windows_server_2022:10.0.20348.288:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_10_1809:10.0.19041.1288:*:*:*:*:*:x64:*

cpe:2.3:o:microsoft:windows_server_2004:10.0.19041.1288:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_10_20H2:10.0.19041.1288:*:*:*:*:*:x86:*

cpe:2.3:o:microsoft:windows_10_20H2:10.0.19041.1288:*:*:*:*:*:arm64:*

cpe:2.3:o:microsoft:windows_server_20H2:10.0.19042.1288:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_11_21H2:10.0.22000.258:*:*:*:*:*:x64:*

cpe:2.3:o:microsoft:windows_11_21H2:10.0.22000.258:*:*:*:*:*:arm64:*

cpe:2.3:o:microsoft:windows_10_1507:10.0.10240.19086:*:*:*:*:*:x86:*

cpe:2.3:o:microsoft:windows_10_1507:10.0.10240.19086:*:*:*:*:*:x64:*

cpe:2.3:o:microsoft:windows_10_1607:10.0.14393.4704:*:*:*:*:*:x86:*

cpe:2.3:o:microsoft:windows_10_1607:10.0.14393.4704:*:*:*:*:*:x64:*

cpe:2.3:o:microsoft:windows_server_2016:10.0.14393.4704:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_7:6.1.7601.25740:sp1:*:*:*:*:x86:*

cpe:2.3:o:microsoft:windows_7:6.1.7601.25740:sp1:*:*:*:*:x64:*

cpe:2.3:o:microsoft:windows_8.1:6.3.9600.20144:*:*:*:*:*:x86:*

cpe:2.3:o:microsoft:windows_8.1:6.3.9600.20144:*:*:*:*:*:x64:*

cpe:2.3:o:microsoft:windows_rt_8.1:6.3.9600.20144:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_server_2008_sp2:6.0.6003.21251:*:*:*:*:*:x64:*

cpe:2.3:o:microsoft:windows_server_2008_sp2:6.0.6003.21251:*:*:*:*:*:x86:*

cpe:2.3:o:microsoft:windows_server_2008_R2:6.1.7601.25740:*:*:*:*:*:x64:*

cpe:2.3:o:microsoft:windows_server_2012:6.2.9200.23490:*:*:*:*:*:x64:*

cpe:2.3:o:microsoft:windows_server_2012_R2:6.3.9600.20144:*:*:*:*:*:x64:*

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