The problem can be corrected by updating your system to the following package versions: Ubuntu 20.04 LTS: gif2apng 1.9+srconly-3ubuntu0.1 Ubuntu 18.04 LTS: gif2apng 1.9+srconly-2ubuntu0.1 Ubuntu 16.04 ESM: gif2apng 1.7-3ubuntu0.1~esm1 In general, a standard system update will make all the necessary changes.
https://ubuntu.com/security/notices/USN-5969-1
CVE-2021-45909, CVE-2021-45910, CVE-2021-45911
https://launchpad.net/ubuntu/+source/gif2apng/1.9+srconly-3ubuntu0.1 https://launchpad.net/ubuntu/+source/gif2apng/1.9+srconly-2ubuntu0.1
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