CVE-2021-32558: Debian Linux

High severity, CVSS 7.5. EPSS: 9.2% chance of exploitation in the next 30 days.

An issue was discovered in Sangoma Asterisk 13.x before 13.38.3, 16.x before 16.19.1, 17.x before 17.9.4, and 18.x before 18.5.1, and Certified Asterisk before 16.8-cert10. If the IAX2 channel driver receives a packet that contains an unsupported media format, a crash can occur.

Affected products

• Debian Debian Linux: version 9.0 only; version 11.0 only
• Digium Asterisk: from 13.0.0, before 13.38.3 (fixed in 13.38.3); from 16.0.0, before 16.19.1 (fixed in 16.19.1); from 17.0.0, before 17.9.4 (fixed in 17.9.4); from 18.0.0, before 18.15.1 (fixed in 18.15.1)
• Digium Certified Asterisk: version 16.8 only

Published 2021-07-30. Last modified 2026-06-17.