OBSS follows a severity classification scheme similar to the one employed by Atlassian.

The severity of security vulnerabilities are determined according to these guidelines. Please note that these are not exact rules but rather guidance criteria.

This is v1 of the document dated 28 July 2020

Severity Level: Critical

Vulnerabilities that score in the critical range usually have most of the following characteristics:

  • Exploitation of the vulnerability likely results in root-level compromise of servers or infrastructure devices.
  • Exploitation is usually straightforward, in the sense that the attacker does not need any special authentication credentials or knowledge about individual victims, and does not need to persuade a target user, for example via social engineering, into performing any special functions.

For critical vulnerabilities, is advised that you patch or upgrade as soon as possible, unless you have other mitigating measures in place. For example, a mitigating factor could be if your installation is not accessible from the Internet.

Severity Level: High

Vulnerabilities that score in the high range usually have some of the following characteristics:

  • The vulnerability is difficult to exploit.
  • Exploitation could result in elevated privileges.
  • Exploitation could result in a significant data loss or downtime. 

Severity Level: Medium

Vulnerabilities that score in the medium range usually have some of the following characteristics:

  • Vulnerabilities that require the attacker to manipulate individual victims via social engineering tactics.
  • Denial of service vulnerabilities that are difficult to set up.
  • Exploits that require an attacker to reside on the same local network as the victim.
  • Vulnerabilities where exploitation provides only very limited access.
  • Vulnerabilities that require user privileges for successful exploitation.  

Severity Level: Low

Vulnerabilities in the low range typically:

  • Have very little impact on an organization's business.
  • Exploitation usually requires local or physical system access.
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