Integer overflow in Skype client before 1.4.x.84 on Windows, before 1.3.x.17 on Mac OS, before 1.2.x.18 on Linux, and 1.1.x.6 and earlier allows remote attackers to cause a denial of service (crash) via crafted network data with a large Object Counter value, which leads to a resultant heap-based buffer overflow.
https://exchange.xforce.ibmcloud.com/vulnerabilities/22850
http://www.vupen.com/english/advisories/2005/2197
http://www.kb.cert.org/vuls/id/905177
http://skype.com/security/skype-sb-2005-03.html
http://securityreason.com/securityalert/115