CVE-2008-5558: Asterisk Business Edition

Medium severity, CVSS 4.3. EPSS: 2% chance of exploitation in the next 30 days.

Asterisk Open Source 1.2.26 through 1.2.30.3 and Business Edition B.2.3.5 through B.2.5.5, when realtime IAX2 users are enabled, allows remote attackers to cause a denial of service (crash) via authentication attempts involving (1) an unknown user or (2) a user using hostname matching.

Affected products

• Asterisk Asterisk Business Edition: version b.2.3.4 only; version b.2.3.5 only; version b.2.5.0 only; version b.2.5.1 only; version b.2.5.3 only
• Asterisk Open Source: version 1.2.26 only; version 1.2.26.1 only; version 1.2.26.2 only; version 1.2.27 only; version 1.2.28 only; version 1.2.29 only; …

Published 2008-12-17. Last modified 2026-06-16.