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IPS Signature Severity Level N/A

Can anyone clear up why an IPS protections would have Severity = N/A?

This article goes over low - critical but not N/A

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N/A means that the associated signature does not have a direct exploit, so there is no severity assigned.  As an example the Protections "Legacy Browsers" and "PDF containing encrypted data" have a severity of N/A.  Is someone is using a Legacy Browser potentially a security threat because the browser doesn't have the latest fixes and could get exploited by a drive by download?  Perhaps but we are not sure.  Could there be some kind of exploit inside an encrypted PDF file?  Maybe. 

So a Severity N/A is just considered informational and notifying you of a situation that you may want to be aware of, but is not a "direct" threat.

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