CVE-2024-21345Public exploit

Privilege escalation via NtQueryInformationThread double-fetch

Published Feb 13, 2024 · Updated Aug 10, 2026

Heap-based buffer overflow in the Windows Kernel before build 10.0.25398.709 allows local users to elevate privileges. NtQueryInformationThread reads mutable Thread Environment Block data twice, allowing a change between validation and use to produce an arbitrary kernel-memory write. Exploitation requires low-privileged local code execution and no user interaction; the resulting write can yield full system control.

CVSS severity8.8
High
EPSS probability20.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer overflow in the Windows Kernel before build 10.0.25398.709 allows local users to elevate privileges. NtQueryInformationThread reads mutable Thread Environment Block data twice, allowing a change between validation and use to produce an arbitrary kernel-memory write. Exploitation requires low-privileged local code execution and no user interaction; the resulting write can yield full system control.

The record

CVE
CVE-2024-21345
Published
Feb 13, 2024
Updated
Aug 10, 2026
Vendor
Microsoft
Product
Windows Server 2022, 23H2 Edition (Server Core installation)
Classifications
CWE-122, 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

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Is a vulnerable build present?

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

  1. Affected versionversion=10.0.25398.0 <10.0.25398.709

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Microsoft · Windows Server 2022, 23H2 Edition (Server Core installation)version=10.0.25398.0 <10.0.25398.709

Published CVSS scores

8.8MicrosoftCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/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.

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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 exploitPublished

Weakness, pattern, technique

CWE-122Heap-based Buffer Overflow
T1068Exploitation for Privilege Escalation

Public exploit references

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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