CVE-2018-12227: Debian Linux

Medium severity, CVSS 5.3. EPSS: 3.5% chance of exploitation in the next 30 days.

An issue was discovered in Asterisk Open Source 13.x before 13.21.1, 14.x before 14.7.7, and 15.x before 15.4.1 and Certified Asterisk 13.18-cert before 13.18-cert4 and 13.21-cert before 13.21-cert2. When endpoint specific ACL rules block a SIP request, they respond with a 403 forbidden. However, if an endpoint is not identified, then a 401 unauthorized response is sent. This vulnerability just discloses which requests hit a defined endpoint. The ACL rules cannot be bypassed to gain access to the disclosed endpoints.

Affected products

• Debian Debian Linux: version 9.0 only
• Digium Asterisk: from 13.0.0, before 13.21.1 (fixed in 13.21.1); after 14.0.0, before 14.7.7 (fixed in 14.7.7); from 15.0.0, before 15.4.1 (fixed in 15.4.1)
• Digium Certified Asterisk: version 13.18 only; version 13.21 only

Published 2018-06-12. Last modified 2026-06-17.