Live › vulnerability › CVE-2024-21338
Go to dashboardA flaw in the Windows kernel driver appid.sys exposes an IOCTL handler without proper access control. A local user with any account can use it to escalate to kernel-level (SYSTEM) privileges.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-23 19:11 UTC, 3h before NVD. All times on this page are UTC.
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
| Product | Ecosystem | Affected | Fixed in |
|---|---|---|---|
| Microsoft Windows | vendor | – | – |
| microsoft windows 10 1809 | vendor | < 10.0.17763.5458 | 10.0.17763.5458 |
| microsoft windows 10 21h2 | vendor | < 10.0.19044.4046 | 10.0.19044.4046 |
| microsoft windows 10 22h2 | vendor | < 10.0.19045.4046 | 10.0.19045.4046 |
| microsoft windows 11 21h2 | vendor | < 10.0.22000.2777 | 10.0.22000.2777 |
| microsoft windows 11 22h2 | vendor | < 10.0.22621.3155 | 10.0.22621.3155 |
| microsoft windows 11 23h2 | vendor | < 10.0.22631.3155 | 10.0.22631.3155 |
| microsoft windows server 2019 | vendor | < 10.0.17763.5458 | 10.0.17763.5458 |
| microsoft windows server 2022 | vendor | < 10.0.20348.2322 | 10.0.20348.2322 |
| microsoft windows server 2022 23h2 | vendor | <= 10.0.25398.709 | – |
Unknown from the sources.
Apply the Microsoft security update for CVE-2024-21338 per vendor instructions; CISA says to discontinue use of the product if mitigations are unavailable.
Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
Microsoft Windows Kernel contains an exposed IOCTL with insufficient access control vulnerability within the IOCTL (input and output control) dispatcher in appid.sys that allows a local attacker to achieve privilege escalation.
CISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
This page as .md · .json · in your agent: get_signal("CVE-2024-21338")
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