CVE-2024-21346

Local SYSTEM escalation via untrusted pointer dereference

Published Feb 13, 2024 · Updated Aug 10, 2026

Untrusted pointer dereference in Microsoft Win32k allows local users on affected Windows builds to gain SYSTEM privileges. Win32k dereferences an attacker-influenced pointer without establishing that the referenced address is trustworthy. A low-privilege local account must execute code on the host; successful exploitation permits arbitrary code in the SYSTEM security context.

CVSS severity7.8
High
EPSS probability4.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Untrusted pointer dereference in Microsoft Win32k allows local users on affected Windows builds to gain SYSTEM privileges. Win32k dereferences an attacker-influenced pointer without establishing that the referenced address is trustworthy. A low-privilege local account must execute code on the host; successful exploitation permits arbitrary code in the SYSTEM security context.

The record

CVE
CVE-2024-21346
Published
Feb 13, 2024
Updated
Aug 10, 2026
Vendor
Microsoft
Product
Windows 11 version 21H2
Classifications
CWE-822, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 13, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.0.0 <10.0.22000.2777

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Microsoft · Windows 11 version 21H2version=10.0.0 <10.0.22000.2777
Microsoft · Windows Server 2022, 23H2 Edition (Server Core installation)version=10.0.25398.0 <10.0.25398.709
Microsoft · Windows 11 Version 22H3version=10.0.22631.0 <10.0.22631.3155
Microsoft · Windows 11 Version 23H2version=10.0.22631.0 <10.0.22631.3155
Microsoft · Windows 11, version 22H2version=10.0.22621.0 <10.0.22621.3155

Published CVSS scores

7.8Microsoft CorporationCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-822Untrusted Pointer Dereference
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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