gdb before 6.3 searches the current working directory to load the .gdbinit configuration file, which allows local users to execute arbitrary commands as the user running gdb.
AV:L/AC:L/Au:N/C:C/I:C/A:C
This vulnerability has a 0.44% probability of being exploited in the next 30 days, ranking higher than 36% of all scored CVEs.