The remote host is missing an update to mpfr announced via advisory USN-772-1.
Details follow:
It was discovered that MPFR improperly handled string lengths in its print routines. If a user or automated system were tricked into processing specially crafted data with applications linked against MPFR, an attacker could cause a denial of service or execute arbitrary code with privileges of the user invoking the program.
Solution: The problem can be corrected by upgrading your system to the following package versions: