Reference: CVE-2018-14767 We strongly advise you to update your Kamailio installation to the latest stable release for security reasons. All supported releases (5.0. and 5.1) contains an important security fix in the Kamailio core related to the handling of “To” headers. The issues were fixed before the 5.0.7, and 5.1.4 releases in the respective stable branches. So if you are already running the 5.0.7 or 5.1.4 release then you have already the fixes deployed. For more details, please see the post on kamailio.org: https://www.kamailio.org/w/2018/07/kamailio-security-announcement-for-kamai… Please address any detailed technical questions related to the two bugs to the developer list at sr-dev(a)lists.kamailio.org. For questions about the configuration workarounds please contact the user list at sr-users(a)lists.kamailio.org. In case of confidential remarks related to this or other security issues, please address them to the Kamailio Management team.