Is this a possible attack on database? In the logs (Drupal 7), I have seen the next entry (I have edited some compromised info). It seems a failed (only I hope it actually failed) attempt to access the login account. I have tried to replicate the error, but cannot have the same error entry with failed login/password, so I am very worried that it originated in some possible breach of Drupal 7 security. 

PDOException: SQLSTATE[42000]: Syntax error or access violation: 1064
You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ' 
'Crap' AND status = 1' at line 1: SELECT * FROM {users} WHERE name = :name_0, :name_1 AND status = 1; Array ( [:name_0] =&gt; FcUk
 [:name_1] =&gt; Crap )
in user_login_authenticate_validate() (line xxxx of /[HOME_ROOT]/[PUBLIC_HTML_PATH]modules/user/user.module).
I asked a member of the Drupal security team about this and he referred me to https://www.drupal.org/drupalsa05FAQ#comment-9255523.

This points to a user attempting to exploit SA CORE 2014 005, but failing due to the site being patched. Cesar's attempt to reproduce triggers the PDOException, but does not (and cannot) result in actual SQL injection.