CVE-2009-0041: Asterisk Business Edition

Medium severity, CVSS 5.0. EPSS: 2.7% chance of exploitation in the next 30 days.

IAX2 in Asterisk Open Source 1.2.x before 1.2.31, 1.4.x before 1.4.23-rc4, and 1.6.x before 1.6.0.3-rc2; Business Edition A.x.x, B.x.x before B.2.5.7, C.1.x.x before C.1.10.4, and C.2.x.x before C.2.1.2.1; and s800i 1.2.x before 1.3.0 responds differently to a failed login attempt depending on whether the user account exists, which allows remote attackers to enumerate valid usernames.

Affected products

• Asterisk Asterisk Business Edition: up to and including b.2.5.2; up to and including c.1.0; version a only; version b.1.3.2 only; version b.1.3.3 only; version b.2.2.0 only; …
• Asterisk Open Source: up to and including 1.2.30.4; up to and including 1.4.23; up to and including 1.6.0.3; version 1.2.0 only; version 1.2.0beta1 only; version 1.2.0beta2 only; …
• Asterisk s800i Appliance: version 1.2 only

Published 2009-01-14. Last modified 2026-06-16.