Why 60% of SaaS Apps Fail Basic TLS Checks

TLS is the foundation of web security. It encrypts data in transit, authenticates your server, and ensures data integrity. Yet in our scans, 60% of SaaS applications have at least one TLS misconfiguration.

These aren't theoretical vulnerabilities. They're the exact checks enterprise security teams run during procurement. Fail them, and the deal stalls.

The Most Common TLS Failures

1. TLS 1.0/1.1 Still Enabled

TLS 1.0 and 1.1 are deprecated. They have known vulnerabilities (BEAST, POODLE) and every major browser has dropped support. Yet 23% of scanned apps still accept connections on these outdated protocols.

The fix: Configure your server or CDN to only allow TLS 1.2 and 1.3. Nginx:

ssl_protocols TLSv1.2 TLSv1.3;

2. Weak Cipher Suites

Some servers still negotiate weak ciphers like RC4, DES, or export-grade cryptography. These can be broken with modern hardware.

The fix: Use a strong cipher list. Mozilla's SSL Configuration Generator (https://ssl-config.mozilla.org/) produces battle-tested configs for every major server.

3. Certificate Chain Issues

The certificate is valid, but the intermediate certificates aren't served correctly. This causes validation failures in some clients and security scanners.

The fix: Always serve the full certificate chain. Test with openssl s_client -connect yourdomain.com:443 -showcerts.

4. Missing OCSP Stapling

OCSP (Online Certificate Status Protocol) lets clients verify a certificate hasn't been revoked. Without OCSP stapling, clients must contact the CA directly — adding latency and creating a privacy leak.

The fix:

# Nginx
ssl_stapling on;
ssl_stapling_verify on;

5. HSTS Not Enforcing HTTPS

Even with a valid TLS certificate, if HSTS isn't set, the first connection can still be intercepted via a man-in-the-middle attack (SSL stripping).

The fix: Set the Strict-Transport-Security header (covered in our security headers guide).

What Enterprise Security Teams Actually Check

When a CISO reviews your security posture, TLS is item #1. They'll look at:

Protocol versions — Only TLS 1.2+

Cipher strength — AES-256, ChaCha20

Certificate validity — Not expired, correct domain

Certificate chain — Complete, trusted CA

Forward secrecy — ECDHE key exchange

Fail any of these and the security questionnaire comes back red.

Check Your TLS Now

Run a free TrustGate scan to check your TLS configuration in seconds. We test all five areas and map findings to SOC 2, ISO 27001, and OWASP compliance frameworks.