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CVE-2024-21338

Windows Kernel Elevation of Privilege Vulnerability

HIGH
7.8
CVSS Score
Published: February 13, 2024 at 06:02 PM UTC
Updated: August 10, 2026 at 04:18 PM UTC
10 products affected across 1 vendorWindows Server 2019Windows 10 1809Windows Server 2022

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Severity
HIGH7.8
Exploitation
CISA KEV
Exploit prediction
EPSS 60%
SSVC
Active

Actively Exploited

CISA Known Exploited Vulnerabilities (KEV) Catalog

EPSS Score59.8%

EPSS (Exploit Prediction Scoring System) estimates a 59.8% chance this CVE is exploited in the wild within the next 30 days — higher than 99% of all CVEs. It complements CVSS: a high EPSS on a mid-severity CVE can still be urgent.

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.

Required Action
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Ransomware Use
Known
Added to KEV
Mar 4, 2024
Remediation Due
Mar 25, 2024
950 days overdue
Notes
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-21338
https://nvd.nist.gov/vuln/detail/CVE-2024-21338

Description

Windows Kernel Elevation of Privilege Vulnerability

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Windows 10 1809· Microsoft
95%
v < 10.0.17763.545810.0.0 ≤ v < 10.0.17763.545810.0.17763.0 ≤ v < 10.0.17763.545810.0.010.0.17763.0
Affected range stops below 10.0.17763.5458, so it looks safe — our inference, not a vendor statement
Windows 10 21H2· Microsoft
95%
v < 10.0.19044.404610.0.19043.0 ≤ v < 10.0.19044.404610.0.19043.0
Affected range stops below 10.0.19044.4046, so it looks safe — our inference, not a vendor statement
Windows 10 22H2· Microsoft
95%
v < 10.0.19045.404610.0.19045.0 ≤ v < 10.0.19045.404610.0.19045.0
Affected range stops below 10.0.19045.4046, so it looks safe — our inference, not a vendor statement
Windows 11 21H2· Microsoft
95%
v < 10.0.22000.277710.0.0 ≤ v < 10.0.22000.277710.0.0
Affected range stops below 10.0.22000.2777, so it looks safe — our inference, not a vendor statement
Windows 11 22H2· Microsoft
95%
v < 10.0.22621.315510.0.22621.0 ≤ v < 10.0.22621.315510.0.22621.0
Affected range stops below 10.0.22621.3155, so it looks safe — our inference, not a vendor statement
Windows 11 23H2· Microsoft
95%
v < 10.0.22631.315510.0.22631.0 ≤ v < 10.0.22631.315510.0.22631.0
Affected range stops below 10.0.22631.3155, so it looks safe — our inference, not a vendor statement
Windows Server 2019· Microsoft
95%
v < 10.0.17763.545810.0.17763.0 ≤ v < 10.0.17763.545810.0.17763.0
Affected range stops below 10.0.17763.5458, so it looks safe — our inference, not a vendor statement
Windows Server 2022· Microsoft
95%
v < 10.0.20348.232210.0.20348.0 ≤ v < 10.0.20348.232210.0.20348.0
Affected range stops below 10.0.20348.2322, so it looks safe — our inference, not a vendor statement
Windows Server 2022 23H2· Microsoft
95%
v ≤ 10.0.25398.70910.0.25398.0 ≤ v < 10.0.25398.70910.0.25398.0
Affected range stops below 10.0.25398.709, so it looks safe — our inference, not a vendor statement
Windows Server 23H2· Microsoft
95%
10.0.25398.0 ≤ v < 10.0.25398.709
Affected range stops below 10.0.25398.709, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (5)

Vendor AdvisoryPatch
Source: [email protected]
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-21338
ExploitTechnical DescriptionThird Party Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
https://decoded.avast.io/janvojtesek/lazarus-and-the-fudmodule-rootkit-beyond-byovd-with-an-admin-to-kernel-zero-day/
ExploitVDB Entry
Source: af854a3a-2127-422b-91ae-364da2661108
https://packetstorm.news/files/id/190586/
ExploitVDB Entry
Source: af854a3a-2127-422b-91ae-364da2661108
https://www.exploit-db.com/exploits/52275
US Government Resource
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-21338

SSVC — Action Prioritization

SSVCActiveNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.8HIGHmicrosoft
Vector?

Quick Info

StatusANALYZED
CWE
CWE-822NVD-CWE-noinfo

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