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DHCP Server service crashes when the DHCPGetClientInfov6() API is called on a Windows Server 2008-based DHCP server

When you configure a computer that is running Windows Server 2008 as a DHCP server, and then you start an application that calls the DHCPGetClientInfoV6() API, the DHCP Server service crashes.
This issue occurs because the DHCP Server service does not perform a NULL check when it uses the address information to populate the client information.

Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing the problem described in this article. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft website: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.


To apply this hotfix, your computer must be running Windows Server 2008 Service Pack 2 (SP2).For more information about how to obtain a Windows Server 2008 service pack, click the following article number to view the article in the Microsoft Knowledge Base:
968849 How to obtain the latest service pack for Windows Server 2008

Registry information

To apply this hotfix, you do not have to make any changes to the registry.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

File information

The global version of this hotfix installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and the times may change when you perform certain operations on the files.
Windows Server 2008 file information notes
Important Windows Vista hotfixes and Windows Server 2008 hotfixes are included in the same packages. However, only "Windows Vista" is listed on the Hotfix Request page. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows Vista" on the page. Always refer to the "Applies To" section in articles to determine the actual operating system that each hotfix applies to.
  • The files that apply to a specific product, SR_Level (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table.
    VersionProductSR_LevelService branch
    6.0.600 2. 22xxxWindows Server 2008SP2LDR
  • Service Pack 1 is integrated into the release version of Windows Server 2008. Therefore, RTM milestone files apply only to Windows Vista. RTM milestone files have a 6.0.0000.xxxxxx version number.
  • The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information for Windows Server 2008 and for Windows Vista" section. MUM files and MANIFEST files, and the associated security catalog (.cat) files, are extremely important to maintaining the state of the updated component. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.
For all supported x86-based versions of Windows Server 2008
File nameFile versionFile sizeDateTimePlatform applicable58109-Sep-201111:26Not applicable
For all supported x64-based versions of Windows Server 2008
File nameFile versionFile sizeDateTimePlatform applicable58115-Nov-201115:05Not applicable
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
The DHCP Server service provides DHCP server management APIs, and these are used to manage the DHCP server. DHCPGetClientInfoV6() is a DHCP server management API that is related to DHCPv6. This API lets the caller receive client\lease information for a specific IP address. This is a publicly documented API, and this API has been supported since DHCPv6 support was introduced for Windows Server 2008. When you call this API on Windows Server 2008 R2, the operation works correctly. However, when you call this API on Windows Server 2008, the DHCP Server service crashes. This issue occurs even if the DHCP server is not configured for IPv6/DHCPv6.

For more information about the DhcpGetClientInfoV6 function, visit the following Microsoft website:For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates

Additional file information

Additional file information for Windows Server 2008

Additional files for all supported x86-based versions of Windows Server 2008
File nameX86_a978aac9c7f043a80855e34fef61bef4_31bf3856ad364e35_6.0.6002.22789_none_13981121e2d8f4c9.manifest
File versionNot applicable
File size705
Date (UTC)01-Feb-2012
Time (UTC)17:04
PlatformNot applicable
File nameX86_microsoft-windows-dhcpserverruntime_31bf3856ad364e35_6.0.6002.22789_none_2b2c7ca8ae078044.manifest
File versionNot applicable
File size141,628
Date (UTC)01-Feb-2012
Time (UTC)15:30
PlatformNot applicable
Additional files for all supported x64-based versions of Windows Server 2008
File nameAmd64_06dcbf77879a12d6bba8f072ed866586_31bf3856ad364e35_6.0.6002.22789_none_b68936764089038e.manifest
File versionNot applicable
File size709
Date (UTC)01-Feb-2012
Time (UTC)17:04
PlatformNot applicable
File nameAmd64_microsoft-windows-dhcpserverruntime_31bf3856ad364e35_6.0.6002.22789_none_874b182c6664f17a.manifest
File versionNot applicable
File size141,672
Date (UTC)01-Feb-2012
Time (UTC)15:46
PlatformNot applicable

Article ID: 2672520 - Last Review: 04/13/2012 07:54:00 - Revision: 2.0

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