CVE-2018-8639
Microsoft Windows Win32k Improper Resource Shutdown or Release Vulnerability
Summary
Microsoft Windows Win32k contains an improper resource shutdown or release vulnerability that allows for local, authenticated privilege escalation. An attacker who successfully exploited this vulnerability could run arbitrary code in kernel mode.
Affected software
Vendor: Microsoft · Product: Windows
Weakness types (CWE):
What to do
This vulnerability appears in CISA's Known Exploited Vulnerabilities catalog, meaning it is being exploited in the wild. Prioritize patching affected systems and verify exposure across your estate.
Related vulnerabilities in Microsoft
| CVE | Name | EPSS | Exploited |
|---|---|---|---|
| CVE-2025-53770 | Microsoft SharePoint Deserialization of Untrusted Data Vulnerability | 100.0% | Yes |
| CVE-2021-34473 | Microsoft Exchange Server Remote Code Execution Vulnerability | 100.0% | Yes |
| CVE-2019-0708 | Microsoft Remote Desktop Services Remote Code Execution Vulnerability | 100.0% | Yes |
| CVE-2015-1635 | Microsoft HTTP.sys Remote Code Execution Vulnerability | 100.0% | Yes |
| CVE-2021-26855 | Microsoft Exchange Server Remote Code Execution Vulnerability | 100.0% | Yes |
| CVE-2025-49704 | Microsoft SharePoint Code Injection Vulnerability | 100.0% | Yes |
| CVE-2021-34523 | Microsoft Exchange Server Privilege Escalation Vulnerability | 100.0% | Yes |
| CVE-2023-29357 | Microsoft SharePoint Server Privilege Escalation Vulnerability | 100.0% | Yes |
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