CVE-2017-6656: Cisco IP Phone 8800 Series

Medium severity, CVSS 5.9. EPSS: 1.7% chance of exploitation in the next 30 days.

A vulnerability in Session Initiation Protocol (SIP) call handling of Cisco IP Phone 8800 Series devices could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition due to the SIP process unexpectedly restarting. All active phone calls are dropped as the SIP process restarts. More Information: CSCvc29353. Known Affected Releases: 11.0(0.1). Known Fixed Releases: 11.0(0)MP2.153 11.0(0)MP2.62.

Affected products

• Cisco IP Phone 8800 Series: version 11.0(0.1) only

Published 2017-06-13. Last modified 2026-06-17.