Active Exploitation of Vulnerability in Adobe Flash Player

Number: AL16-008
Date: May 11, 2016


The purpose of this alert is to bring attention to the active exploitation of a recently disclosed vulnerability in Adobe Flash Player.


CCIRC is aware of attacks exploiting a previously unknown critical vulnerability in Adobe Flash Player.  The vulnerability exists in version and earlier versions for Windows, Macintosh, Linux, and Chrome OS.   Identified as CVE-2016-4117, exploitation of this vulnerability could allow an attacker to take control of the affected system after having caused a deliberate crash.

Adobe is planning to provide a patch as early as 12 May 2016.

Suggested action

CCIRC recommends system administrators test and deploy the latest version of Adobe Flash Player to affected systems accordingly in an effort to mitigate this vulnerability. Operators may also consider disabling Adobe Flash until a permanent patch has been released.


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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