Memory leak in Cisco Unified Communications Manager IM and Presence Service before 8.6(5)SU1 and 9.x before 9.1(2), and Cisco Unified Presence, allows remote attackers to cause a denial of service (memory and CPU consumption) by making many TCP connections to port (1) 5060 or (2) 5061, aka Bug ID CSCud84959.

The Packet Capture Service in Cisco Unified Communications Manager (aka CUCM, formerly CallManager) 4.x does not properly handle idle TCP connections, which allows remote attackers to cause a denial of service (memory consumption and restart) by making many connections, aka Bug ID CSCtf97162.

The CTI Manager service in Cisco Unified Communications Manager (aka CUCM, formerly CallManager) 4.x before 4.3(2)sr1a, 6.x before 6.1(3), 7.0x before 7.0(2), 7.1x before 7.1(2), and 8.x before 8.0(1) allows remote attackers to cause a denial of service (service failure) via a malformed message, aka Bug ID CSCsu31800.

Cisco Unified Communications Manager (aka CUCM, formerly CallManager) 4.x before 4.3(2)SR2, 6.x before 6.1(5), 7.x before 7.1(3a)su1, and 8.x before 8.0(1) allows remote attackers to cause a denial of service (process failure) via a malformed SCCP StationCapabilitiesRes message with an invalid MaxCap field, aka Bug ID CSCtc38985.

The IP Phone Personal Address Book (PAB) Synchronizer feature in Cisco Unified Communications Manager (aka CUCM, formerly CallManager) 4.1, 4.2 before 4.2(3)SR4b, 4.3 before 4.3(2)SR1b, 5.x before 5.1(3e), 6.x before 6.1(3), and 7.0 before 7.0(2) sends privileged directory-service account credentials to the client in cleartext, which allows remote attackers to modify the CUCM configuration and perform other privileged actions by intercepting these credentials, and then using them in requests unrelated to the intended synchronization task, as demonstrated by (1) DC Directory account credentials in CUCM 4.x and (2) TabSyncSysUser account credentials in CUCM 5.x through 7.x.

Unspecified vulnerability in the Session Initiation Protocol (SIP) implementation in Cisco IOS 12.2 through 12.4 and Unified Communications Manager 4.1 through 6.1, when VoIP is configured, allows remote attackers to cause a denial of service (device or process reload) via unspecified valid SIP messages, aka Cisco Bug ID CSCsu38644, a different vulnerability than CVE-2008-3801 and CVE-2008-3802.

Unspecified vulnerability in the Session Initiation Protocol (SIP) implementation in Cisco IOS 12.2 through 12.4 and Unified Communications Manager 4.1 through 6.1, when VoIP is configured, allows remote attackers to cause a denial of service (device or process reload) via unspecified valid SIP messages, aka Cisco Bug ID CSCsm46064, a different vulnerability than CVE-2008-3800 and CVE-2008-3802.

The Certificate Authority Proxy Function (CAPF) service in Cisco Unified Communications Manager (CUCM) 4.1 before 4.1(3)SR7, 4.2 before 4.2(3)SR4, and 4.3 before 4.3(2) allows remote attackers to cause a denial of service (service crash) via malformed network traffic, aka Bug ID CSCsk46770.

Memory leak in the Certificate Trust List (CTL) Provider service in Cisco Unified Communications Manager (CUCM) 5.x before 5.1(3) allows remote attackers to cause a denial of service (memory consumption and service interruption) via a series of malformed TCP packets, as demonstrated by TCPFUZZ, aka Bug ID CSCsj80609.

Cisco Unified Communications Manager (CUCM) 5.x before 5.1(2) and 6.x before 6.1(1) allows remote attackers to cause a denial of service (service interruption) via a SIP JOIN message with a malformed header, aka Bug ID CSCsi48115.