SQL injection vulnerability in aspWebCalendar allows remote attackers to execute arbitrary SQL statements via (1) the username field on the login page or (2) the eventid parameter to calendar.asp.
https://www.exploit-db.com/exploits/3546
https://exchange.xforce.ibmcloud.com/vulnerabilities/33157
https://exchange.xforce.ibmcloud.com/vulnerabilities/17506
http://www.vupen.com/english/advisories/2007/1093
http://www.securityfocus.com/bid/23098
http://secunia.com/advisories/24622