CVE-2024-43642Network attack vector

Remote system crash via SMB use-after-free

Published Nov 12, 2024 · Updated Jul 8, 2025

Use-after-free in Windows SMB on affected Windows 11 and Windows Server builds allows remote attackers to crash the system over a network. Microsoft identifies the weakness as use-after-free but has not disclosed the responsible SMB routine, object-lifetime error, or triggering request sequence. No authentication or user interaction is required; successful exploitation interrupts service by crashing the affected Windows system.

CVSS severity7.5
High
EPSS probability62.69%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Windows SMB on affected Windows 11 and Windows Server builds allows remote attackers to crash the system over a network. Microsoft identifies the weakness as use-after-free but has not disclosed the responsible SMB routine, object-lifetime error, or triggering request sequence. No authentication or user interaction is required; successful exploitation interrupts service by crashing the affected Windows system.

The record

CVE
CVE-2024-43642
Published
Nov 12, 2024
Updated
Jul 8, 2025
Vendor
Microsoft
Product
Windows Server 2025 (Server Core installation)
Classifications
CWE-416, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 12, 2024CVE publishedPublication date reported by the CVE source.
  2. Jul 8, 2025Record 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=10.0.26100.0 <10.0.26100.2314

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft · Windows Server 2025 (Server Core installation)version=10.0.26100.0 <10.0.26100.2314
Microsoft · Windows 11, version 24H2version=10.0.26100.0 <10.0.26100.2314
Microsoft · Windows Server 2022, 23H2 Edition (Server Core installation)version=10.0.25398.0 <10.0.25398.1251
Microsoft · Windows 11 Version 22H3version=10.0.22631.0 <10.0.22631.4460
Microsoft · Windows 11 Version 23H2version=10.0.22631.0 <10.0.22631.4460
Microsoft · Windows 11, version 22H2version=10.0.22621.0 <10.0.22621.4460
Microsoft · Windows Server 2022version=10.0.20348.0 <10.0.20348.2849
Microsoft · Windows Server 2025version=10.0.26100.0 <10.0.26100.2314

Published CVSS scores

7.5Microsoft CorporationCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1499Endpoint Denial of Service

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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