Agnitum Outpost Firewall PRO 4.0 has been disclosed with a vulnerability that, if exploited by a malicious user, could cause a denial of service (DoS). And all this because the program cannot handle unexpected input the right way. Every program should properly test any data input before actually using it, as incorrect data may cause crashes.

As SecurityFoucs informs, service can be denied to legitimate users, if a hacker would exploit these issues. There is no telling if remote code-execution could be possible as it has not yet been confirmed. So yes, this could get pretty critical if a hacker that really knows what he's doing would tamper with it.

Out of the firewall's 4.0 versions, the 964.582.059 and 971.584.079 ones are affected for sure, but there might be others as well. However, do not panic; all you need to do is update to the latest version which is 4.0 (1005.590.123). Do this and you'll have this issue fixed.

Here is their official website if you want to get more info about the software. In any case, this is a vulnerability and can cause some nasty things, but whatever you do, don't give up firewall protection. Also, keep in mind that no software is perfect.

I had used Agnitum Outpost Firewall PRO for some time and to be frank, I was pretty happy with it. Didn't prompt me with stupid questions and it was quite easy to configure. There was something about it though, I don't know whether something good or bad - if it happened to crash, then all Internet access was shut down, just like yanking out the cable. But after restarting the machine, everything would be back to normal.

However, if you wish to learn more about these vulnerabilities, you can read about them on SecurityFocus - just click this link!