I will give you a description of vulnerability. You should extract vulnerable functions. Write the output in following format:
FUNCS function1, function2, ...
If you found no functions, output "NONE". Print only functions mentioned in description.

Here is the description:
A improper restriction of excessive authentication attempts vulnerability [CWE-307] in Fortinet FortiMail version 6.4.0, version 6.2.0 through 6.2.4 and before 6.0.9 allows a remote unauthenticated attacker to partially exhaust CPU and memory via sending numerous HTTP requests to the login form.
 Write your response with exactly 2 paragraphs, separated with the markdown divider: ***.
user