The problem can be corrected by updating your system to the following package versions: Ubuntu 18.04 LTS: libdjvulibre21 3.5.27.1-8ubuntu0.4 Ubuntu 16.04 ESM: libdjvulibre21 3.5.27.1-5ubuntu0.1+esm2 In general, a standard system update will make all the necessary changes.
https://ubuntu.com/security/notices/USN-5005-1
CVE-2021-3630
https://launchpad.net/ubuntu/+source/djvulibre/3.5.27.1-8ubuntu0.4
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