Microsoft-owned Skype is leaking sensitive user data, including internal and external IP addresses and TCP ports.
The issue has been publicly disclosed and I've confirmed that a web-based tool is available to help attackers pinpoint the last known IP address of a Skype user.
In addition to public IP addresses, an attacker with a Skype username can siphon addition information like city, country, Internet provider and the internal user ip-address.
A statement from Skype described the privacy leak as "an ongoing, industry-wide issue faced by all peer-to-peer software companies."
The company said it is committed to the safety and security of our customers and are taking measures to help protect Skype users.