Active Exploitation of a Vulnerability in Microsoft Silverlight

Number: AL16-001
Date: 13 January 2016


The purpose of this alert is to bring attention to a recently disclosed vulnerability in Microsoft Silverlight that is under active exploitation.


CCIRC is aware of attacks exploiting a recently patched critical vulnerability in Microsoft Silverlight. Identified as CVE-2016-0034, this vulnerability can allow for remote code execution if a user visits a webpage containing a specially crafted Silverlight application.

Suggested action

Due to the elevated risk presented by this vulnerability, CCIRC recommends that system administrators test and deploy the vendor-released updates to affected applications accordingly. CCIRC recommends that priority is given to this patch.


CCIRC Advisory AV15-006: Microsoft Critical Security Bulletins Summary for January Microsoft Critical Security Bulletins Summary for January 2016

Microsoft Security Bulletin MS16-006 - Security Update for Silverlight to Address Remote Code Execution (3126036):

SecureList: The Mysterious Case of CVE-2016-0034: the hunt for a Microsoft Silverlight 0-day

Note to Readers

In support of Public Safety's mission to build a safe and resilient Canada, CCIRC's mandate is to help ensure the security and resilience of the vital non-federal government cyber systems that underpin Canada's national security, public safety and economic prosperity. As Canada's computer security incident response team, CCIRC is Canada's national coordination centre for the prevention and mitigation of, preparedness for, response to, and recovery from cyber incidents on non-federal government systems. It does this by providing authoritative advice and support, and coordinating information sharing and incident response.

Please note, CCIRC PGP key has recently been updated.

For general information, please contact Public Safety Canada's Public Affairs division at:

Telephone: 613-944-4875 or 1-800-830-3118
Fax: 613-998-9589

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