Unspecified vulnerability in Skype allows remote attackers to cause a denial of service (server hang) via unknown vectors related to sending long URIs as claimed to be actively exploited on 20070817 using a \call to a specific number.\ NOTE: this identifier is for the en.securitylab.ru disclosure. According to the vendor this issue is separate from the \sign-on issues\ that reduced Skype service on 20070817 which appears to be a site-specific problem. As of 20070821 it is not clear whether this issue is simply a symptom of the larger sign-on problem.