Drupal Password Hashing Denial of Service Vulnerability

Summary
A vulnerability in the password hashing API of Drupal 7 can lead to a DoS.
Impact
An unauthenticated attacker can cause a denial of service. Impact Level: Application
Solution
Upgrade to Drupal 7.34 or later
Insight
Drupal 7 includes a password hashing API to ensure that user supplied passwords are not stored in plain text. An attacker can send specially crafted requests resulting in CPU and memory exhaustion.
Affected
Drupal 7
Detection
Check the version of Drupal.
References