Checkmarx Research Lab presents a new attack vector on Web applications. By exploiting the Regular Expression Denial of Service (ReDoS) vulnerability an attacker can make a Web application unavailable to its intended users. ReDoS is commonly known as a ?bug? in systems, but Alex Roichman and Adar Weidman from Checkmarx show how serious it is and how using this technique, various applications can be ?ReDoSed?. These include, among others, Server-side of Web applications and Client-side Browsers. The art of attacking the Web by ReDoS is by finding inputs which cannot be matched by Regexes and on these Regexes a Regex-based Web systems get stuck. For further reading: http://www.checkmarx.com/NewsDetails.aspx?id=23&cat=3 AlexRoichman Chief Architect, Checkmarx Ltd. Mobile: +972 547745198 Fax: +972-3-6870794 Website: www.Checkmarx.com