The problem can be corrected by updating your system to the following package versions: Ubuntu 20.04 LTS: librecad 2.1.3-1.2+deb10u1build0.20.04.1 Ubuntu 18.04 LTS: librecad 2.1.2-1ubuntu0.1~esm1 Ubuntu 16.04 ESM: librecad 2.0.9-2ubuntu0.1~esm1 In general, a standard system update will make all the necessary changes.
https://ubuntu.com/security/notices/USN-5957-1
CVE-2018-19105, CVE-2021-21898, CVE-2021-21899, CVE-2021-21900,
CVE-2021-45341, CVE-2021-45342, CVE-2021-45343
https://launchpad.net/ubuntu/+source/librecad/2.1.3-1.2+deb10u1build0.20.04.1
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