For the exploitation of a zero day attack it is possible for an end user of Nessus or OpenVAS to write custom code in NASL which is executed by these vulnerability scanners. Files that are written in this language usually get the file extension. Tens of thousands of plugins have been written in NASL for Nessus and OpenVAS. With NASL specific attacks can be automated, based on known vulnerabilities. The Nessus Attack Scripting Language, usually referred to as NASL, is a scripting language that is used by vulnerability scanners like Nessus and OpenVAS. Automation tool for computer vulnerability scanners
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