MS15-009: Description of the security update for JScript9.dll in Internet Explorer: February 10, 2015

Applies to: Internet Explorer 11Internet Explorer 10Internet Explorer 9


This article describes the cumulative security update for JScript9.dll in Internet Explorer that is dated February 10, 2015. This security update resolves an issue in the Jscript9.dll component that leads to an Address Space Layout Randomization (ASLR) security feature bypass. For more information about this update, see Microsoft Knowledge Base article 3034682 .


Microsoft has released security bulletin MS15-009. To learn more about this security bulletin:

How to obtain help and support for this security update

Help installing updates: Support for Microsoft Update

Security solutions for IT professionals:
TechNet Security Support and Troubleshooting

Help protect your Windows-based computer from viruses and malware: Virus and Security Solution Center

Local support according to your country:
International Support

More Information

Restart information

You may have to restart the computer after you install this security update.

In some cases, this update does not require a restart. If the required files are being used, this update will require a restart. If this behavior occurs, a message is displayed that advises you to restart the computer.

To help reduce the possibility that a restart will be required, stop all affected services and close all applications that may use the affected files before you install this security update.

For more information, see the following Microsoft Knowledge Base article:

887012  Why you may be prompted to restart your computer after you install a security update on a Windows-based computer for more information.