CVE-2024-21338—Microsoft Windows Kernel Exposed IOCTL with Insufficient Access Control Vulnerability

Vulnerability Name

Microsoft Windows Kernel Exposed IOCTL with Insufficient Access Control Vulnerability

Description

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.

Known To Be Used in Ransomware Campaigns?

Ransomware Status:

KNOWN

Action

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Additional Notes

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-21338
• https://nvd.nist.gov/vuln/detail/CVE-2024-21338

Related News Articles

• Google Reports 75 Zero-Days Exploited in 2024 — 44% Targeted Enterprise Security ProductsApril 29, 2025
• Microsoft's Patch Tuesday Fixes 63 Flaws, Including Two Under Active ExploitationFebruary 12, 2025
• New Mallox ransomware Linux variant based on leaked Kryptina codeSeptember 23, 2024
• North Korean Hackers Deploy FudModule Rootkit via Chrome Zero-Day ExploitAugust 31, 2024
• Microsoft Patches Zero-Day Flaw Exploited by North Korea’s Lazarus GroupAugust 19, 2024

Related Weaknesses

• CWE-822