A vulnerability has been reported in Cisco IP Phone 7940 and 7960, which can be exploited by malicious people to cause a DoS (Denial of Service).
The vulnerability is caused due to an error within the handling of certain SIP INVITE messages. This can be exploited to reboot the device by sending a specially crafted INVITE message with a malformed "sipURI" field of the Remote-Party-ID.
The vulnerability is reported in devices running firmware POS3-07-4-00.
Solution: Update to firmware version 8.6(0) (POS8-6-0).
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Subject: Cisco IP Phone 7940/7960 SIP INVITE Denial of Service Vulnerability
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