CVE-2017-17850: Digium Asterisk

High severity, CVSS 7.5. EPSS: 75.4% chance of exploitation in the next 30 days.

An issue was discovered in Asterisk 13.18.4 and older, 14.7.4 and older, 15.1.4 and older, and 13.18-cert1 and older. A select set of SIP messages create a dialog in Asterisk. Those SIP messages must contain a contact header. For those messages, if the header was not present and the PJSIP channel driver was used, Asterisk would crash. The severity of this vulnerability is somewhat mitigated if authentication is enabled. If authentication is enabled, a user would have to first be authorized before reaching the crash point.

Affected products

• Digium Asterisk: from 13.0.0, up to and including 13.18.4; from 14.0.0, up to and including 14.7.4; from 15.0.0, up to and including 15.1.4
• Digium Certified Asterisk: version 13.1.0 only; version 13.8 only

Published 2017-12-27. Last modified 2026-06-17.