/usr/lib/x86_64-linux-gnu/libcyrus_sieve.so.0 is in cyrus-common 2.5.10-3ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libcyrus_sieve.so.0.0.0
/usr/lib/x86_64-linux-gnu/libcyrus_sieve.so.0.0.0