CVE-2016-2316: Digium Asterisk

Medium severity, CVSS 5.9. EPSS: 5% chance of exploitation in the next 30 days.

chan_sip in Asterisk Open Source 1.8.x, 11.x before 11.21.1, 12.x, and 13.x before 13.7.1 and Certified Asterisk 1.8.28, 11.6 before 11.6-cert12, and 13.1 before 13.1-cert3, when the timert1 sip.conf configuration is set to a value greater than 1245, allows remote attackers to cause a denial of service (file descriptor consumption) via vectors related to large retransmit timeout values.

Affected products

• Digium Asterisk: version 1.8.0 only; version 1.8.1 only; version 1.8.1.1 only; version 1.8.1.2 only; version 1.8.2 only; version 1.8.2.1 only; …
• Digium Certified Asterisk: version 1.8.28 only; version 11.6 only; version 11.6.0 only; version 13.1 only; version 13.1.0 only
• Fedoraproject Fedora: version 22 only; version 23 only

Published 2016-02-22. Last modified 2026-06-17.