Certified Ethical Hacker (CEH v8) — Question 2

An NMAP scan of a server shows port 25 is open. What risk could this pose?

Answer options

• A. Open printer sharing
• B. Web portal data leak
• C. Clear text authentication
• D. Active mail relay

Correct answer: D

Explanation

Port 25 is typically used for SMTP, and if it's open, the server may be exploited to send emails without authorization, leading to an active mail relay. The other options do not directly relate to the function of port 25 or the risks associated with its misuse in a mail context.