A vulnerability has been identified in Nortel SIP Multimedia PC Client, which could be exploited by attackers to cause a denial of service. This issue is caused due to the application not limiting the number of sessions, which could be exploited by attackers to exhaust all available memory resources, creating a denial of service condition.
Note: A second issue caused due to a lack of authentication on received SIP INVITE messages could be exploited to propagate SPIT (Spam over Internet Telephony).
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