Cisco IOS and Unified Communications Manager (CUCM) contains a flaw that may allow a remote denial of service. The issue is triggered during the processing of a malformed Session Initiation Protocol (SIP) message that contains a valid Session Description Protocol (SDP) message. With a specially crafted SIP packet in this message, a remote attacker can cause a loss of availability for the program.
Remote / Network Access
Loss of Availability
Voice over IP
Upgrade to the version specified by the vendor or higher, as it has been reported to fix this vulnerability. It is also possible to temporarily work around the flaw by implementing the workaround described in the vendor advisory.