Two of the flaws could allow attackers to take over a Skype users system. The flaws affect a number of Windows versions of the software ranging between version 1.1 to 1.4. Security research firm Secunia has rated the flaws “highly critical,” and listed a third type of error that could be exploited to crash the Skype client. There is no known malicious software that takes advantage of these bugs, according to Secunia. There are now 61 million registered Skype users, more than enough to attract the attention of hackers.”]
Source: https://www.csoonline.com/article/2119533/skype-patches-critical-flaws.html