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Port 1194 – OpenVPN

Service:

openvpn

Protocol:

UDP

Port:

1194

Used for:

A widely used open-source VPN solution that provides secure point-to-point or site-to-site connections

Why It’s Open

Port 1194 is the default port used by OpenVPN, a widely used open-source VPN solution that provides secure point-to-point or site-to-site connections. This port is used for encapsulating VPN traffic using SSL/TLS and is often found open on VPN gateways, remote access servers, and cloud infrastructure.

Common Risks

Although OpenVPN is generally secure when properly configured, leaving port 1194 exposed—especially with weak or default settings—can lead to:

  • Brute-Force Attacks
    Attackers may attempt to guess user credentials or client certificates if rate limiting or MFA is not enforced.
  • Information Disclosure:
    Some OpenVPN servers may leak version information or reveal that OpenVPN is running, aiding reconnaissance.
  • Unauthorized Access:
    If client certificates or authentication keys are stolen or misconfigured, attackers could gain access to internal networks.
  • Exploitable Vulnerabilities
    Outdated OpenVPN versions may contain vulnerabilities such as buffer overflows or remote code execution flaws.

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Enumeration & Testing

Check if it’s open

Terminal window
nmap -sU -p 1194

Use OpenVPN to test

Terminal window
openvpn --config client.ovpn
Terminal window
echo | nc -u -v  1194

What to Look For

Checkpoint What it means
Port 1194 open externally VPN is publicly reachable — verify security settings
No rate limiting Susceptible to brute-force or DoS attempts
Self-signed or weak certs May be vulnerable to MitM or trust issues
Outdated OpenVPN version May contain known CVEs

Mitigation

  • Restrict Access
    Allow port 1194 only from trusted IPs or regions using firewall rules.
  • Use Strong Authentication
    Implement two-factor authentication and strong client certificate policies.
  • Keep OpenVPN Updated
    Always use the latest stable release to patch known vulnerabilities
  • Enable TLS Auth (tls-auth or tls-crypt)
    This adds an additional HMAC signature to packets, preventing unauthorized connections and some DoS attacks.
  • Monitor Logs and Connections
    Regularly review connection logs to detect abnormal access attempts.

Known CVEs and Exploits