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Zero-Day Research | Fixes Available

Fortinet's team of dedicated expert researchers and analysts examine many third party products and software applications daily, looking for weaknesses and exploitable vulnerabilities. When a vulnerability is found the Fortiguard Lab teams work together to create protective measures that can be delivered to our customers and notify the software/product vendor of the vulnerability. Learn More

Vulnerability Severity Level

FortiGuard Event Name's Severity Level is mainly based on the ratings set forth by the Common Vulnerability Scoring System (CVSS). The CVSS is a vendor-neutral, industry standard that provides an open framework for communicating the characteristics and impacts of IT vulnerabilities.

FortiGuard Security Level	CVSS v2 Rating
Critical	9 - 10
High	7 - 8.9
Medium	4 - 6.9
Low	0.1 - 3.9
Info	0

Common Vulnerability Scoring System Version 2.0

The Common Vulnerability Scoring System (CVSS) provides an open framework for communicating the characteristics and impacts of IT vulnerabilities. CVSS consists of 3 groups: Base, Temporal and Environmental.

Each group produces a numeric score ranging from 0 to 10, and a Vector, a compressed textual representation that reflects the values used to derive the score. The Base group represents the intrinsic qualities of a vulnerability. The Temporal group reflects the characteristics of a vulnerability that change over time.

The Environmental group represents the characteristics of a vulnerability that are unique to any user's environment. CVSS enables IT managers, vulnerability bulletin providers, security vendors, application vendors and researchers to all benefit by adopting this common language of scoring IT vulnerabilities.

Exceptions

If there is no CVSS rating posted, then the CVSS rating is calculated. A Base Score tool form is available at: http://nvd.nist.gov/cvss.cfm
If the vulnerable software/system is not common in a business network environment and the FortiGuard Severity Level would normally be Critical, then the FortiGuard Severity Level may be reduced to High.
If the vulnerability is a Denial of Service (DoS) attack and only affecting the availability of a remote service or host, then the FortiGuard Severity Level is adjusted to at most Medium for Client-side DoS and High for Server-side DoS
For any "remote code execution" type of vulnerability, the FortiGuard Severity Level is set to either High or Critical.

Exceptions

For identifying or detecting network traffic, the FortiGuard Severity Level is set to Informational.
For a vulnerability/exploit that is highly active, the FortiGuard Severity Level is temporarily set to either High or Critical. Later, the level may be reduced back to its normal level; generally this is based on the temporal parameter of a vulnerability.
For zero-day vulnerabilities where the rating has not yet been fully evaluated, the FortiGuard Severity Level is generally set at either Medium or High.

For more information on CVSS, visit A Complete Guide to the Common Vulnerability Scoring System Version 2.0.

Please view our Responsible Disclosure Policies

FG-VD-17-141 (Microsoft)

Fortinet Discovers Microsoft PowerPoint 2011 for Mac Memory Corruption Vulnerability

Jul 27, 2017 Risk

CVE-2017-8742

FG-VD-16-079 (Microsoft)

Fortinet Discovers Microsoft Word RTF File Handling Memory Corruption Vulnerability

Nov 10, 2016 Risk

CVE-2017-0003

FG-VD-15-099 (Microsoft)

Fortinet Discovers Microsoft Office PowerPoint Shape Sbjects Handling Memory Corruption Vulnerability

Nov 16, 2015 Risk

CVE-2016-0055

FG-VD-15-077 (Microsoft)

Fortinet Discovers Microsoft Office Excel Memory Corruption Vulnerability

Sep 24, 2015 Risk

CVE-2015-6177

FG-VD-15-048 (Microsoft)

Fortinet Discovers Microsoft SharePoint Cross-Site Scripting Vulnerability

Jun 16, 2015 Risk

CVE-2015-2522

FG-VD-10-038 (Microsoft)

Fortinet Discovers Vulnerability in Microsoft Windows Kernel NDProxy

Sep 07, 2010 Risk

CVE-2010-3963

FG-VD-09-022 (Microsoft)

Fortinet Discovers Memory Corruption Vulnerability In Microsoft Internet Explorer

Jul 22, 2009 Risk

CVE-2010-0247

FG-VD-19-149 (Microsoft)

Fortinet Discovers Microsoft Windows Imaging Library UncompressFile Memory Corruption

Nov 19, 2019 Risk

CVE-2020-0708

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