/usr/lib/x86_64-linux-gnu/libCVector.so is in libcvector2-dev 1.0.3.1-1.1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libCVector.so.2.0.0
/usr/lib/x86_64-linux-gnu/libCVector.so.2.0.0