Post Office Protocol version 3 (POP3): 110

Security Weaknesses

• Transmits credentials in plaintext.

• Susceptible to credential sniffing and session hijacking.

• Lacks encryption by default unless configured for POP3S.

Security Defense and Mitigation Measures

• Use POP3S (SSL/TLS) to secure communication.

• Enforce strong password policies.

• Monitor POP3 access logs for unusual patterns.

Indicators of Compromise or Attack

• Unencrypted traffic on port 110 (TCP).

• Repeated failed login attempts.

• Abnormal POP3 traffic volumes.