The issue of cybercrime and other anti-social activities is increasingly discussed today. The cause is an increasing number of individuals, companies or states exposed to these threats. This article deals with the issue of cyber aggression as one of the kinds of other anti-social activities. The article presents the results of researches in the Slovak Republic, but also the results of a survey at selected schools conducted by the Faculty of Safety Engineering of the University of Zilina. The main aim of the article is to point out the issue of cybercrime and other antisocial activities among adolescents and to point out the relationship between their education and vulnerability.