|Date: (C)2007-08-21 (M)2017-08-01|
|CVSS Score: 7.1||Access Vector: NETWORK|
|Exploitability Subscore: 8.6||Access Complexity: MEDIUM|
|Impact Subscore: 6.9||Authentication: NONE|
| ||Confidentiality: NONE|
| ||Integrity: NONE|
| ||Availability: COMPLETE|
Cisco IP Phone 7940 and 7960 with P0S3-08-6-00 firmware, and other SIP firmware before 8.7(0), allows remote attackers to cause a denial of service (device reboot) via (1) a certain sequence of 10 invalid SIP INVITE and OPTIONS messages; or (2) a certain invalid SIP INVITE message that contains a remote tag, followed by a certain set of two related SIP OPTIONS messages.