What’s Vulnerable › Vulnerabilities

CVE-2018-12227

• Severity: medium (CVSS 5.3 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2018-06-12 · updated 2026-06-17
• Weakness: CWE-200

Description

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 Linux: 9.0
• Digium Asterisk: from 13.0.0 before 13.21.1; from 14.0.0 (excl.) before 14.7.7; from 15.0.0 before 15.4.1 — fixed in 13.21.1, 14.7.7, 15.4.1
• Digium Certified Asterisk: 13.18-cert1, 13.18-cert2, 13.18-cert3, 13.21-cert1

How to fix

Upgrade to a fixed version: Digium Asterisk 13.21.1, 14.7.7, 15.4.1. Check the vendor advisory for mitigations.

References

• http://downloads.asterisk.org/pub/security/AST-2018-008.html
• http://www.securityfocus.com/bid/104455
• https://issues.asterisk.org/jira/browse/ASTERISK-27818
• https://security.gentoo.org/glsa/201811-11
• https://www.debian.org/security/2018/dsa-4320
• http://downloads.asterisk.org/pub/security/AST-2018-008.html
• http://www.securityfocus.com/bid/104455
• https://issues.asterisk.org/jira/browse/ASTERISK-27818
• https://security.gentoo.org/glsa/201811-11
• https://www.debian.org/security/2018/dsa-4320

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