Cisco Security Advisory: Cisco TelePresence ISDN Gateway D-Channel Denial of Service Vulnerability Advisory ID: cisco-sa-20140122-isdngw Revision 1.0 For Public Release 2014 January 22 16:00 UTC (GMT) +--------------------------------------------------------------------- Summary ======= Cisco TelePresence ISDN Gateway contains a vulnerability that could allow an unauthenticated, remote attacker to trigger the drop of the data channel (D-channel) causing all calls to be terminated and preventing users from making new calls. Cisco has released free software updates that address this vulnerability. No workarounds that mitigate this vulnerability are available. This advisory is available at the following link: http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20140122-isdngw