Top 30 Targeted High Risk Vulnerabilities

Last Revised
Alert Code

Systems Affected

Systems running unpatched software from Adobe, Microsoft, Oracle, or OpenSSL. 


Cyber threat actors continue to exploit unpatched software to conduct attacks against critical infrastructure organizations. As many as 85 percent of targeted attacks are preventable [1].

This Alert provides information on the 30 most commonly exploited vulnerabilities used in these attacks, along with prevention and mitigation recommendations.

It is based on analysis completed by the Canadian Cyber Incident Response Centre (CCIRC) and was developed in collaboration with our partners from Canada, New Zealand, the United Kingdom, and the Australian Cyber Security Centre.

Unpatched vulnerabilities allow malicious actors entry points into a network. A set of vulnerabilities are consistently targeted in observed attacks.


A successful network intrusion can have severe impacts, particularly if the compromise becomes public and sensitive information is exposed. Possible impacts include:

  • Temporary or permanent loss of sensitive or proprietary information,
  • Disruption to regular operations,
  • Financial losses relating to restoring systems and files, and
  • Potential harm to an organization’s reputation.


Maintain up-to-date software

The attack vectors frequently used by malicious actors such as email attachments, compromised “watering hole” websites, and other tools often rely on taking advantage of unpatched vulnerabilities found in widely used software applications. Patching is the process of repairing vulnerabilities found in these software components.

It is necessary for all organizations to establish a strong ongoing patch management process to ensure the proper preventive measures are taken against potential threats. The longer a system remains unpatched, the longer it is vulnerable to being compromised. Once a patch has been publicly released, the underlying vulnerability can be reverse engineered by malicious actors in order to create an exploit. This process has been documented to take anywhere from 24-hours to four days. Timely patching is one of the lowest cost yet most effective steps an organization can take to minimize its exposure to the threats facing its network.

Patch commonly exploited vulnerabilities

Executives should ensure their organization’s information security professionals have patched the following software vulnerabilities. Please see patching information for version specifics.

CVE Affected Products Patching Information
CVE-2006-3227 ​Internet Explorer Microsoft Malware Protection Encyclopedia Entry
CVE-2008-2244 Office Word Microsoft Security Bulletin MS08-042
CVE-2009-3129 Office
Office for Mac
Open XML File Format Converter for Mac
Office Excel Viewer
Office Compatibility Pack for Word, Excel, and PowerPoint
Microsoft Security Bulletin MS09-067
​CVE-2009-3674 ​Internet Explorer ​Microsoft Security Bulletin MS09-072
CVE-2010-0806​ ​Internet Explorer Microsoft Security Bulletin MS10-018
CVE-2010-3333 Office
Office for Mac
Open XML File Format Converter for Mac
Microsoft Security Bulletin MS10-087
CVE-2011-0101 Excel Microsoft Security Bulletin MS11-021
CVE-2012-0158 Office
SQL Server
BizTalk Server
Commerce Server
Visual FoxPro
Visual Basic
Microsoft Security Bulletin MS12-027
CVE-2012-1856 Office
SQL Server
Commerce Server
Host Integration Server
Visual FoxPro Visual Basic
Microsoft Security Bulletin MS12-060
​CVE-2012-4792 ​Internet Explorer ​Microsoft Security Bulletin MS13-008
CVE-2013-0074 ​Silverlight and Developer Runtime Microsoft Security Bulletin MS13-022
CVE-2013-1347 ​Internet Explorer Microsoft Security Bulletin MS13-038
CVE-2014-0322​ ​​Internet Explorer Microsoft Security Bulletin MS14-012
CVE-2014-1761 Microsoft Word
Office Word Viewer
Office Compatibility Pack
Office for Mac
Word Automation Services on SharePoint Server
Office Web Apps
Office Web Apps Server
Microsoft Security Bulletin MS14-017
​CVE-2014-1776 ​Internet Explorer Microsoft Security Bulletin MS14-021
CVE-2014-4114 ​Windows Microsoft Security Bulletin MS14-060
CVE Affected Products Patching Information
CVE-2012-1723 Java Development Kit, SDK, and JRE Oracle Java SE Critical Patch Update Advisory - June 2012
CVE-2013-2465 Java Development Kit and JRE Oracle Java SE Critical Patch Update Advisory - June 2013
CVE Affected Products Patching Information
​CVE-2009-3953 Reader Acrobat ​ Adobe Security Bulletin APSB10-02​
​CVE-2010-0188 ​Reader Acrobat Adobe Security Bulletin APSB10-07
CVE-2010-2883 Reader Acrobat ​ Adobe Security Bulletin APSB10-21
CVE-2011-0611 ​Flash Player
Adobe Security Bulletin APSB11-07
Adobe Security Bulletin APSB11-08​
​CVE-2011-2462 Reader Acrobat ​ Adobe Security Bulletin APSB11-30
​CVE-2013-0625 ColdFusion​ Adobe Security Bulletin APSB13-03
CVE-2013-0632 ​ColdFusion Adobe Security Bulletin APSB13-03
​CVE-2013-2729 ​Reader Acrobat Adobe Security Bulletin APSB13-15
​CVE-2013-3336 ​ColdFusion Adobe Security Bulletin APSB13-13
CVE-2013-5326 ​ColdFusion Adobe Security Bulletin APSB13-27
CVE-2014-0564 Flash Player
AIR SDK & Compiler
Adobe Security Bulletin APSB14-22
CVE Affected Products Patching Information
CVE-2014-0160 OpenSSL CERT Vulnerability Note VU#720951


Implement the following four mitigation strategies.

As part of a comprehensive security strategy, network administrators should implement the following four mitigation strategies, which can help prevent targeted cyber attacks.

Ranking Mitigation Strategy Rationale
1 Use application whitelisting to help prevent malicious software and unapproved programs from running. Application whitelisting is one of the best security strategies as it allows only specified programs to run, while blocking all others, including malicious software.
2 Patch applications such as Java, PDF viewers, Flash, web browsers and Microsoft Office. Vulnerable applications and operating systems are the target of most attacks. Ensuring these are patched with the latest updates greatly reduces the number of exploitable entry points available to an attacker.
3 Patch operating system vulnerabilities.
4 Restrict administrative privileges to operating systems and applications based on user duties. Restricting these privileges may prevent malware from running or limit its capability to spread through the network.

It is recommended that users review US-CERT Security Tip (ST13-003) and CCIRC’s Mitigation Guidelines for Advanced Persistent Threats for additional background information and to assist in the detection of, response to, and recovery from malicious activity linked to advance persistent threats [2, 3].




April 29, 2015: Initial release

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