Active Exploitation of Vulnerability in Adobe Flash Player

Number: AL16-020
Date: 27 October 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: versions and earlier of Adobe Flash Player Desktop Runtime, Adobe Flash Player for Google Chrome, and Adobe Flash Player for Microsoft Edge and Internet Explorer 11; and version of Adobe Flash Player for Linux. Identified as CVE-2016-7855, exploitation of this vulnerability could allow an attacker to take control of the affected system.

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.

Organizations should consider installing Microsoft's Experience Mitigation Toolkit (EMET). The Enhanced Mitigation Experience Toolkit helps mitigate the exploitation of vulnerabilities by adding additional protection layers that make them harder to exploit.


CCIRC Advisory AV16-174: Security Update for Adobe Flash Player:

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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