Unclosed vulnerabilities in software are "gateway" through which penetrate into the computer system by hackers and malicious software.
According to the company Secunia, half-user computers running Microsoft Windows is installed, on average, more than 66 programs from 22-vendors. The use of such a large number of heterogeneous software without means of automated patch management leads to the fact that much of the software does not have all the required patches.
The problem is compounded by the fact that for a number of vulnerabilities patch does not exist. Attacks carried out by hackers already discovered flaws, which have not yet issued a corrigendum and of which remains to be seen on a large number of computer professionals are called attacks "zero day". Such attacks pose the greatest danger to the user and at the same time great value for cybercriminals.
During the period of "zero day" attackers have the best conditions for the attacks: ready hacking exploit, and the lack of available patches and antivirus signatures. However, many users ignore the need to install patches for the software even after their release - in particular for the software that is not part of the operating system.
