CVE-2009-0871: Digium Asterisk

Low severity, CVSS 3.5. EPSS: 2.6% chance of exploitation in the next 30 days.

The SIP channel driver in Asterisk Open Source 1.4.22, 1.4.23, and 1.4.23.1; 1.6.0 before 1.6.0.6; 1.6.1 before 1.6.1.0-rc2; and Asterisk Business Edition C.2.3, with the pedantic option enabled, allows remote authenticated users to cause a denial of service (crash) via a SIP INVITE request without any headers, which triggers a NULL pointer dereference in the (1) sip_uri_headers_cmp and (2) sip_uri_params_cmp functions.

Affected products

• Digium Asterisk: version 1.4.22 only; version 1.4.23 only; version 1.4.23.1 only; version 1.6.0 only; version 1.6.0.1 only; version 1.6.0.2 only; …

Published 2009-03-11. Last modified 2026-06-16.