Adobe Flash Critical Vulnerability

Number: AL18-002
Date: 1 February 2018


The purpose of this alert is to bring attention to a recently disclosed critical vulnerability (CVE-2018-4878) that exists in Adobe Flash Player and earlier versions.


CCIRC is aware of an exploit for CVE-2018-4878 existing in the wild, and is being used in limited, targeted attacks against Windows users. These attacks leverage Office documents with embedded malicious Flash content distributed via email. Successful exploitation could potentially allow an attacker to take control of the affected system.

Affected Products ( and earlier versions) :

Suggested action

Adobe will address this vulnerability in a release planned for the week of February 5.

Due to the potential risk presented by this vulnerability, CCIRC recommends that system administrators monitor for the developer released security fix.


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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