It was discovered that there was a potential denial-of-service (DoS) attack
in the Kamailio SIP telephony server. This was caused by the Kamailio server
mishandling INVITE
requests with duplicated fields.
For Debian 10 Buster, this problem has been fixed in version 5.2.1-1+deb10u1.
We recommend that you upgrade your kamailio packages.
Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: https://wiki.debian.org/LTS