CVE-2023-38254Network attack vector

Service interruption via crafted MSMQ packet

Published Aug 8, 2023 · Updated Aug 10, 2026

Improper input validation in Microsoft Message Queuing allows remote attackers to interrupt service with a crafted MSMQ packet. Microsoft has not published the specific MSMQ parser or validation operation that mishandles the packet. Exploitation requires Message Queuing to be installed and a local user to access it after packet delivery, causing only a service interruption.

CVSS severity6.5
Medium
EPSS probability1.64%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Microsoft Message Queuing allows remote attackers to interrupt service with a crafted MSMQ packet. Microsoft has not published the specific MSMQ parser or validation operation that mishandles the packet. Exploitation requires Message Queuing to be installed and a local user to access it after packet delivery, causing only a service interruption.

The record

CVE
CVE-2023-38254
Published
Aug 8, 2023
Updated
Aug 10, 2026
Vendor
Microsoft
Product
Windows 10 Version 1507
Classifications
CWE-20, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 8, 2023CVE 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=10.0.10240.0 <10.0.10240.20107

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft · Windows 10 Version 1507version=10.0.10240.0 <10.0.10240.20107
Microsoft · Windows Server 2019version=10.0.17763.0 <10.0.17763.4737
Microsoft · Windows Server 2016 (Server Core installation)version=10.0.14393.0 <10.0.14393.6167
Microsoft · Windows 11 version 21H2version=10.0.22000.0 <10.0.22000.2295
Microsoft · Windows Server 2012 (Server Core installation)version=6.2.9200.0 <6.2.9200.24414
Microsoft · Windows Server 2012version=6.2.9200.0 <6.2.9200.24414
Microsoft · Windows 10 Version 21H2version=10.0.19044.0 <10.0.19044.3324
Microsoft · Windows Server 2016version=10.0.14393.0 <10.0.14393.6167
Microsoft · Windows Server 2008 R2 Service Pack 1version=6.1.7601.0 <6.1.7601.26664
Microsoft · Windows Server 2008 R2 Service Pack 1 (Server Core installation)version=6.1.7601.0 <6.1.7601.26664
Microsoft · Windows 10 Version 22H2version=10.0.19045.0 <10.0.19045.3324
Microsoft · Windows Server 2012 R2 (Server Core installation)version=6.3.9600.0 <6.3.9600.21503
Microsoft · Windows Server 2019 (Server Core installation)version=10.0.17763.0 <10.0.17763.4737
Microsoft · Windows 11, version 22H2version=10.0.22621.0 <10.0.22621.2134
Microsoft · Windows 10 Version 1607version=10.0.14393.0 <10.0.14393.6167
Microsoft · Windows Server 2008 Service Pack 2version=6.0.6003.0 <6.0.6003.22216
Microsoft · Windows Server 2022version=10.0.20348.0 <10.0.20348.1906
Microsoft · Windows 10 Version 1809version=10.0.0 <10.0.17763.4737; version=10.0.17763.0 <10.0.17763.4737
Microsoft · Windows Server 2012 R2version=6.3.9600.0 <6.3.9600.21503
Microsoft · Windows Server 2008 Service Pack 2 (Server Core installation)version=6.0.6003.0 <6.0.6003.22216

Published CVSS scores

6.5MicrosoftCVSS:3.1/AV:N/AC:L/PR:N/UI:R/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-20Improper Input Validation
T1499.004Application or System Exploitation

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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