Vulnerability · CVE-2024-21338
Microsoft Windows Kernel Exposed IOCTL with Insufficient Access Control Vulnerability
Published Feb 13, 2024 · catalog updated Aug 10, 2026 · Microsoft Windows
Patch now
CVE-2024-21338 is in the CISA known-exploited catalog, due Mar 25, 2024. Confirm Microsoft Windows against the vendor advisory and apply that fix. The CVSS score does not change the priority.
Gaps on this record
- No version range is stored. A customer cannot check an installed version against this record.
- Severity
- High7.8
- Known exploitation
- CISA KEV and VulnCheck KEV
- EPSS
- 59.81%
- Remediation
- Remediation guidance
- Affected products
- cpe microsoft/windows 10 1809 · cpe microsoft/windows 10 21h2 · cpe microsoft/windows 10 22h2 · cpe microsoft/windows 11 21h2 · cpe microsoft/windows 11 22h2 · cpe microsoft/windows 11 23h2
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.
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- cpe microsoft/windows 10 1809version unspecified
- cpe microsoft/windows 10 21h2version unspecified
- cpe microsoft/windows 10 22h2version unspecified
- cpe microsoft/windows 11 21h2version unspecified
- cpe microsoft/windows 11 22h2version unspecified
- cpe microsoft/windows 11 23h2version unspecified
- cpe microsoft/windows server 2019version unspecified
- cpe microsoft/windows server 2022version unspecified
- vendor Microsoft Windowsversion unspecified
How to fix CVE-2024-21338
Recommended remediation
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. CISA due date Mar 25, 2024.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
CVE-2024-21338 is in the CISA known-exploited catalog, due Mar 25, 2024. Confirm Microsoft Windows against the vendor advisory and apply that fix. The CVSS score does not change the priority.
Which versions are affected?
Affected version ranges are not on this record. Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
What should an analyst verify?
CWE-822. EPSS 59.81%. The CISA KEV listing is the exploitation evidence. A public exploit reference is linked in Sources. That is not the same as confirmed exploitation. Use the source links for the original advisory.
Technology hubs
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Feb 13, 2024 · Catalog
Detected
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.
Mar 4, 2024 · CISA KEV
Known exploited
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Mar 25, 2024 · CISA KEV
Remediation due
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Aug 10, 2026 · Catalog
Updated
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
- CISA KEVConfirmed exploitationCVE-2024-21338
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.gov - CVE.orgVulnerability recordCVE-2024-21338
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2024-21338
30-day exploitation probability 59.8%
first.org - Exploit DatabasePublic exploit reference51946
Public archive entry. The exploit body is not stored here.
exploit-db.com - Exploit DatabasePublic exploit reference52275
Public archive entry. The exploit body is not stored here.
exploit-db.com - NIST NVDVulnerability recordCVE-2024-21338
Windows Kernel Elevation of Privilege Vulnerability
nvd.nist.gov - VulnCheck KEVConfirmed exploitationCVE-2024-21338
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.
vulncheck.com
References
- VulnCheck exploitation evidence · api.msrc.microsoft.com
- Exploit · decoded.avast.io
- VulnCheck exploitation evidence · decoded.avast.io
- VulnCheck exploitation evidence · docs.google.com
- CISA note · msrc.microsoft.com
- CISA note · nvd.nist.gov
- Exploit · packetstorm.news
- US Government Resource · cisa.gov
- VulnCheck exploitation evidence · cisa.gov
- Exploit · exploit-db.com
Freshness
Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.