The host is installed with PuTTY 0.68 before 0.81, WinSCP before 6.3.3, FileZilla before 3.67.0 and is prone to a key recovery attack vulnerability. A flaw is present in the application, which fails to properly handle issues in the ECDSA nonce generation. Successful exploitation allows an attacker to recover a user's NIST P-521 secret key via a quick attack in approximately 60 signatures and further after a key compromise an attacker may be able to conduct supply-chain attacks on software maintained in Git.