Debian Security Advisory

DLA-3438-1 kamailio -- LTS security update

Date Reported:
30 May 2023
Affected Packages:
Security database references:
In Mitre's CVE dictionary: CVE-2020-27507.
More information:

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.

  • CVE-2020-27507

    The Kamailio SIP before 5.5.0 server mishandles INVITE requests with duplicated fields and overlength tag, leading to a buffer overflow that crashes the server or possibly have unspecified other impact.

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: