Common SSL Security Vulnerabilities and How to Fix Them
Harden SSL/TLS by disabling weak protocols, ciphers, and enforcing correct hostname, chain, and OCSP.
📋 In This Guide
- Understanding the basics
- Step-by-step implementation
- Best practices and tips
- Common issues and solutions
- Tools and resources
Top Issues
- Using SSLv3/TLS 1.0/1.1
- Weak ciphers (RC4, 3DES) and small keys
- Missing intermediate chain
- Hostname mismatch
- Expired or not-yet-valid certificates
Recommended Fixes
- Enable only TLS 1.2/1.3
- Prefer modern ciphers and ECDSA/RSA ≥ 2048 bits
- Install full chain including intermediates
- Ensure SANs include the exact host
- Automate renewals and monitor expiry