The (1) ssh2_load_userkey and (2) ssh2_save_userkey functions in PuTTY 0.51 through 0.63 do not properly wipe SSH-2 private keys from memory, which allows local users to obtain sensitive information by reading the memory.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 50.0%