CVE-2018-16657: Debian Linux

Critical severity, CVSS 9.8. EPSS: 3.6% chance of exploitation in the next 30 days.

In Kamailio before 5.0.7 and 5.1.x before 5.1.4, a crafted SIP message with an invalid Via header causes a segmentation fault and crashes Kamailio. The reason is missing input validation in the crcitt_string_array core function for calculating a CRC hash for To tags. (An additional error is present in the check_via_address core function: this function also misses input validation.) This could result in denial of service and potentially the execution of arbitrary code.

Affected products

• Debian Debian Linux: version 8.0 only; version 9.0 only
• Kamailio Kamailio: before 5.0.7 (fixed in 5.0.7); from 5.1.0, before 5.1.4 (fixed in 5.1.4)

Published 2018-09-07. Last modified 2026-06-17.