Since we already know that the server software manufacturer detected the hole the day before, and that a new patch will be available in three days but the LAN administrator needs at least a week to download the software, test it, and then install the patch, then we can calculate that the approximate window of vulnerability will be about 8 days at the very minimum. In this particular case, we do not know the specific time or day in which this occurs. To explain, further, we’ll use a made up day and time frame.
Let’s say for this particular scenario, that the attack hole was detected on Tuesday morning at 9:00am, and the attack happened the next day, or on Wednesday, around 8:00am. If the software company or manufacturer can’t have the patch ready for about 3 days, this means that we’ll most likely receive the patch around Monday or Tuesday of the following week. This is because in most cases, business days are when anything from a software company will be carried out. Once this patch has been received by the LAN administrator, he/she will need to install it and conduct tests to make sure that everything within the patch is fully