Security researcher Alexander Kolesnik reported while the Mozilla platform does not yet support TLS connections to TURN and STUN servers, the WebRTC implementation would accept turns: and stuns: URIs and then attempt plaintext connections to the servers when these were used. This can lead to disclosure of credentials through a Man-in-the-middle (MITM) attack as the connection is not encrypted. External Reference: https://www.mozilla.org/en-US/security/advisories/mfsa2015-15 Acknowledgements: Red Hat would like to thank the Mozilla project for reporting this issue. Upstream acknowledges Alexander Kolesnik as the original reporter. Statement: This issue does not affect the version of firefox and thunderbird as shipped with Red Hat Enterprise Linux 5, 6 and 7.