Microsoft Communicator, and Communicator in Microsoft Office 2010 beta, allows remote attackers to cause a denial of service (memory consumption) via a large number of SIP INVITE requests, which trigger the creation of many sessions.

References

• https://nvd.nist.gov/vuln/detail/CVE-2008-5180
• https://exchange.xforce.ibmcloud.com/vulnerabilities/46673
• https://exchange.xforce.ibmcloud.com/vulnerabilities/57581
• https://www.exploit-db.com/exploits/7262
• http://secunia.com/advisories/32940
• http://www.exploit-db.com/exploits/12079
• http://www.securityfocus.com/bid/39221
• http://www.securitytracker.com/id?1021294
• http://www.voipshield.com/research-details.php?id=133