MS16-012: Security update for Microsoft Windows PDF Library to address remote code execution: February 9, 2016

Applies to: Windows 10Windows Server 2012 R2 DatacenterWindows Server 2012 R2 Standard


This security update resolves vulnerabilities in Microsoft Windows. The more severe of the vulnerabilities could allow remote code execution if Microsoft Windows PDF Library incorrectly handles application programming interface (API) calls. This could allow an attacker to run arbitrary code on the user’s system. An attacker who successfully exploited the vulnerabilities could gain the same user rights as the current user. Customers whose accounts are configured to have fewer user rights on the system could be less affected than those who operate with administrative user rights. However, an attacker would be unable to force users to download or open a malicious PDF document.

To learn more about the vulnerability, see Microsoft Security Bulletin MS16-012.

More Information

  • All future security and nonsecurity updates for Windows 8.1, and Windows Server 2012 R2 require update 2919355 to be installed. We recommend that you install update 2919355 on your Windows 8.1-based, or Windows Server 2012 R2-based computer so that you receive future updates.
  • If you install a language pack after you install this update, you must reinstall this update. Therefore, we recommend that you install any language packs that you need before you install this update. For more information, see Add language packs to Windows.

Additional information about this security update

The following articles contain additional information about this security update as it relates to individual product versions. The articles may contain known issue information.
  • 3123294 MS16-012: Description of the security update for Windows PDF Library: February 9, 2016
  • 3135174 Cumulative Update for Windows 10: February 9, 2016

How to obtain and install the update

Method 1: Windows Update

This update is available through Windows Update. When you turn on automatic updating, this update will be downloaded and installed automatically. For more information about how to turn on automatic updating, see
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