CVE-2011-2529: Digium Asterisk

Medium severity, CVSS 5.0. EPSS: 4.3% chance of exploitation in the next 30 days.

chan_sip.c in the SIP channel driver in Asterisk Open Source 1.6.x before 1.6.2.18.1 and 1.8.x before 1.8.4.3 does not properly handle '\0' characters in SIP packets, which allows remote attackers to cause a denial of service (memory corruption) or possibly have unspecified other impact via a crafted packet.

Affected products

• Digium Asterisk: version 1.6.0 only; version 1.6.0.1 only; version 1.6.0.2 only; version 1.6.0.3 only; version 1.6.0.4 only; version 1.6.0.5 only; …

Published 2011-07-06. Last modified 2026-06-16.