Port Intelligence Profile
Port 587: SMTP-SSL
Analyze default service protocols, historical security vulnerabilities, hardening methods, and firewall rules for port 587.
Default Service
SMTP-SSL
Protocol
TCP
Risk Level
Medium
Port Range
System (1-1023)
1. Port Purpose & Usage
Port 587 is registered for SMTP-SSL network communication.
2. Security Risks & Vulnerability Profiles
Exposing port 587 publicly increases attack surface. Ensure proper firewall filters and authentication checks are enforced.
3. Hardening & Mitigation Checklist
1
Restrict access to port using local firewall rules.
2
Disable standard passwords; use cryptographic authentication if supported.
4. Firewall Command Examples
Use the following system configurations to restrict open port exposure on Linux hosts:
# UFW: Deny public access to port 587
ufw deny 587/tcp
Further Analysis
Email Infrastructure Ports
Ports often operate in clusters. When analyzing a service on Port 587, security engineers typically check the status of these related ports.