The problem can be corrected by updating your system to the following package versions: Ubuntu 21.04: libapache2-mod-auth-mellon 0.17.0-1ubuntu0.21.04.1 In general, a standard system update will make all the necessary changes.
https://ubuntu.com/security/notices/USN-5069-2
https://ubuntu.com/security/notices/USN-5069-1
CVE-2021-3639
https://launchpad.net/ubuntu/+source/libapache2-mod-auth-mellon/0.17.0-1ubuntu0.21.04.1
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