Small to mid-sized businesses can keep safe from most cyber attacks by protecting the ports that threat actors target the most. Three of them stand out in a crowd of more than 130,000 targeted in cyber incidents. A report from threat intelligence and defense company Alert Logic enumerates the top weaknesses observed in attacks against over 4,000 of its customers.
"As basic guidance, security across all network ports should include defense-in-depth. Ports that are not in use should be closed and organizations should install a firewall on every host as well as monitor and filter port traffic. Regular port scans and penetration testing are also best practices to help ensure there are no unchecked vulnerabilities" - Alert Logic
