stunnel ☆
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Description:
SSL tunneling program
Type: Formula  |  Latest Version: 5.76@0  |  Tracked Since: Oct 18, 2025
Links: Homepage  |  formulae.brew.sh
Category: Security
Tags: ssl tls encryption networking security tunnel
Install: brew install stunnel
About:
stunnel is a versatile SSL/TLS wrapper that provides secure encryption for existing network services without modifying their source code. It creates an encrypted tunnel between a local and a remote port, securing legacy applications and plaintext protocols. This makes it ideal for hardening insecure connections and enabling secure remote access.
Key Features:
  • Client and server mode operation
  • Supports STARTTLS for protocol upgrades
  • Works with any TCP-based service
  • Cross-platform compatibility
  • Flexible configuration with OpenSSL
Use Cases:
  • Securing legacy plaintext protocols like SMTP, POP3, and IMAP
  • Creating encrypted tunnels for database connections
  • Adding TLS to services that don't natively support it
  • Secure remote access to internal services
Alternatives:
  • socat – More general-purpose but requires manual SSL configuration
  • nginx stream – Reverse proxy with TLS termination, heavier weight
  • ssh -L – Built-in tunneling but limited to SSH protocol
Version History
Detected Version Rev Change Commit
Oct 18, 2025 5:38pm 0 VERSION_BUMP da5d3e50
Sep 10, 2024 11:19pm 0 VERSION_BUMP e755f85b
Feb 5, 2024 9:45am 0 VERSION_BUMP 282cdb20
Sep 27, 2023 2:20am 0 VERSION_BUMP 565d8eca
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