ACTIVELY EXPLOITED
CVE-2024-21338: Microsoft Windows Kernel Exposed IOCTL with Insufficient Access Control Vulnerability
| Vendor | Microsoft |
|---|---|
| Product | Windows |
| Actively exploited | Yes |
| Added to CISA KEV | 4 Mar 2024 |
| CISA federal deadline | 25 Mar 2024 |
| Ransomware use | Known |
| Weakness (CWE) | CWE-822 |
Required action (CISA's text)
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Description (NVD)
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.
SOURCES
Other Microsoft flaws
- patchtuesday:2026-11: Vulnerability in Microsoft
- CVE-2026-124194: Microsoft Office Outlook Missing User Interaction for Potentially Unsafe Action Vulnerability
- CVE-2026-96951: Microsoft Windows Command Injection Vulnerability
- CVE-2026-65660: Microsoft SharePoint Code Injection Vulnerability
- CVE-2026-85880: Microsoft Windows Heap-Based Buffer Overflow Vulnerability
Data from NVD, CISA KEV, FIRST EPSS and vendor advisories. Updated 10 Nov 2026.