Password Generator (aka Pwgen) before 2.07 generates weak non-tty passwords, which makes it easier for context-dependent attackers to guess the password via a brute-force attack.

Password Generator (aka Pwgen) before 2.07 uses weak pseudo generated numbers when /dev/urandom is unavailable, which makes it easier for context-dependent attackers to guess the numbers.

The Phonemes mode in Pwgen 2.06 generates predictable passwords, which makes it easier for context-dependent attackers to guess the password via a brute-force attack.