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I mean those that infect by only viewing a website or clicking a link. Not those that you have to click "Download" in the Windows dialog.

I want to know how important are virus definition updates in anti-virus software.

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closed as not constructive by Synetech, Canadian Luke, afrazier, slhck, MaQleod Jul 24 '12 at 17:40

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How important is it to get a regular pay cheque? – Canadian Luke Jul 24 '12 at 17:21
@Luke A pay cheque is used to buy things. An anti-virus definition update, if you don't download anything, is for... "drive by" infections. If a vulnerability in a main browser (Chrome or Firefox) is found once a year - you might be willing to use a free anti-virus suite. – Startup1 Jul 25 '12 at 12:31
@Startup1 What's wrong with a free AV suite? – iglvzx Jul 25 '12 at 19:23

There are numerous lists and databases of exploits and vulnerabilities: exploit list, exploit database, vulnerability list, vulnerability database

  • CVE (Common Vulnerabilities and Exposures)
  • NVD (National Vulnerability Database)
  • OSVDB (Open-source Vulnerability Database)
  • Metasploit
  • GFI

As for “how important” it is to keep antimalware definitions updated, the answer is yes, I mean 17, wait, purple. No, monkey. No, no, it’s dishwasher. There is no answer to that question as there is no unit of measure. Suffice it to say that it is important.

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I wish I could upvote this twice. One for a good answer and one for humor – nathpilland Jul 24 '12 at 17:41
Since you don’t know the answer to my question - how do you know that "it is important."? – Startup1 Jul 25 '12 at 12:22
I do know the answer to your question, like I said the answer is is; there is no measure. You want to know how much important it is? What does that even mean? What exactly do you expect to hear? I said it is 17 important; does that work for you? No? Okay, fine I’ll add some units. It is 17 meters important. Good? How about 17 dollars important? Maybe 17 bytes important? – Synetech Jul 25 '12 at 14:46

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