CVE-2019-18790: Debian Linux

Medium severity, CVSS 6.5. EPSS: 4.2% chance of exploitation in the next 30 days.

An issue was discovered in channels/chan_sip.c in Sangoma Asterisk 13.x before 13.29.2, 16.x before 16.6.2, and 17.x before 17.0.1, and Certified Asterisk 13.21 before cert5. A SIP request can be sent to Asterisk that can change a SIP peer's IP address. A REGISTER does not need to occur, and calls can be hijacked as a result. The only thing that needs to be known is the peer's name; authentication details such as passwords do not need to be known. This vulnerability is only exploitable when the nat option is set to the default, or auto_force_rport.

Affected products

• Debian Debian Linux: version 8.0 only; version 9.0 only
• Digium Asterisk: from 13.0.0, before 13.29.2 (fixed in 13.29.2); from 16.0.0, before 16.6.2 (fixed in 16.6.2); from 17.0.0, before 17.0.1 (fixed in 17.0.1)
• Digium Certified Asterisk: version 13.21.0 only

Published 2019-11-22. Last modified 2026-06-17.