The problem can be corrected by updating your system to the following package versions: Ubuntu 18.04 LTS: libmagick++-6.q16-7 8:6.9.7.4+dfsg-16ubuntu6.12 Ubuntu 16.04 ESM: libmagick++-6.q16-5v5 8:6.8.9.9-7ubuntu5.16+esm1 Ubuntu 14.04 ESM: libmagick++5 8:6.7.7.10-6ubuntu3.13+esm1 In general, a standard system update will make all the necessary changes.
https://ubuntu.com/security/notices/USN-5158-1
CVE-2021-20244, CVE-2021-20246, CVE-2021-20309, CVE-2021-20312,
CVE-2021-20313
https://launchpad.net/ubuntu/+source/imagemagick/8:6.9.7.4+dfsg-16ubuntu6.12
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