The JTapi Gateway process in Cisco Unified Contact Center Enterprise, Unified Contact Center Hosted, IP Contact Center Enterprise, and Cisco IP Contact Center Hosted 5.0 through 7.1 allows remote attackers to cause a denial of service (repeated process restart) via a certain TCP session on the JTapi server port.

Multiple TCP implementations with Protection Against Wrapped Sequence Numbers (PAWS) with the timestamps option enabled allow remote attackers to cause a denial of service (connection loss) via a spoofed packet with a large timer value, which causes the host to discard later packets because they appear to be too old.