CVE-2020-35652: Digium Asterisk

Medium severity, CVSS 6.5. EPSS: 1.9% chance of exploitation in the next 30 days.

An issue was discovered in res_pjsip_diversion.c in Sangoma Asterisk before 13.38.0, 14.x through 16.x before 16.15.0, 17.x before 17.9.0, and 18.x before 18.1.0. A crash can occur when a SIP message is received with a History-Info header that contains a tel-uri, or when a SIP 181 response is received that contains a tel-uri in the Diversion header.

Affected products

• Digium Asterisk: before 13.38.0 (fixed in 13.38.0); from 14.0, before 16.15.0 (fixed in 16.15.0); from 17.0, before 17.9.0 (fixed in 17.9.0); from 18.0, before 18.1.0 (fixed in 18.1.0)

Published 2021-01-29. Last modified 2026-06-17.