CVEs / CVE-2024-21338
CVE-2024-21338: Microsoft Windows Kernel Exposed IOCTL with Insufficient Access Control Vulnerability
- Known exploited in the CISA KEV catalog since 4 Mar 2024
- high 7.8 CVSS 3.1 (from the CNA)
- EPSS 59.8% chance of exploitation in the next 30 days, higher than 99% of CVEs (30 Oct 2026)
- Last changed at its sources
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Summary
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.
Description
Windows Kernel Elevation of Privilege Vulnerability
Affected and fixed versions
| Product | Affected | Fixed in |
|---|---|---|
| Microsoft Windows 10 Version 1809 | from 10.0.17763.0, before 10.0.17763.5458 | 10.0.17763.5458 |
| Microsoft Windows 10 Version 1809 | from 10.0.0, before 10.0.17763.5458 | 10.0.17763.5458 |
| Microsoft Windows 10 Version 21H2 | from 10.0.19043.0, before 10.0.19044.4046 | 10.0.19044.4046 |
| Microsoft Windows 10 Version 22H2 | from 10.0.19045.0, before 10.0.19045.4046 | 10.0.19045.4046 |
| Microsoft Windows 11 version 21H2 | from 10.0.0, before 10.0.22000.2777 | 10.0.22000.2777 |
| Microsoft Windows 11 version 22H2 | from 10.0.22621.0, before 10.0.22621.3155 | 10.0.22621.3155 |
| Microsoft Windows 11 version 22H3 | from 10.0.22631.0, before 10.0.22631.3155 | 10.0.22631.3155 |
| Microsoft Windows 11 Version 23H2 | from 10.0.22631.0, before 10.0.22631.3155 | 10.0.22631.3155 |
| Microsoft Windows Server 2019 | from 10.0.17763.0, before 10.0.17763.5458 | 10.0.17763.5458 |
| Microsoft Windows Server 2019 (Server Core installation) | from 10.0.17763.0, before 10.0.17763.5458 | 10.0.17763.5458 |
| Microsoft Windows Server 2022 | from 10.0.20348.0, before 10.0.20348.2322 | 10.0.20348.2322 |
| Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) | from 10.0.25398.0, before 10.0.25398.709 | 10.0.25398.709 |
Exploitation
| In CISA KEV since | 4 Mar 2024 |
|---|---|
| Due date for US federal agencies | 25 Mar 2024 |
| Used in ransomware campaigns | Known |
| Required action | Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. |
Severity
| CVSS 3.1 | 7.8 highCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HScored by the CNA ([email protected]) |
|---|---|
| Weakness | CWE-822 |
References
- CVE-2024-21338 on NVD
- CVE-2024-21338 in the CISA KEV catalog
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-21338 (cited by CISA)
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-21338 Patch, Vendor Advisory
- https://decoded.avast.io/janvojtesek/lazarus-and-the-fudmodule-rootkit-beyond-byovd-with-an-admin-to-kernel-zero-day/ Exploit, Technical Description, Third Party Advisory
- https://packetstorm.news/files/id/190586/ Exploit, VDB Entry
- https://www.exploit-db.com/exploits/52275 Exploit, VDB Entry
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-21338 US Government Resource
Sources
Exploitation status from the CISA Known Exploited Vulnerabilities catalog. EPSS scores from FIRST. Descriptions, severity and references from the National Vulnerability Database. Open-source package versions from OSV (CC-BY 4.0). Text is shown as each source states it; Stackurity does not edit it. Check the vendor's advisory before acting.
This product uses data from the NVD API but is not endorsed or certified by the NVD.