TLS Fallback SCSV Checker

Check if TLS_FALLBACK_SCSV is supported to prevent downgrade attacks

About TLS Fallback SCSV Checker

Our TLS Fallback SCSV Checker tests whether a server supports the TLS_FALLBACK_SCSV cipher suite value, a defense mechanism against protocol downgrade attacks. When enabled, it prevents attackers from forcing a connection to fall back to a weaker TLS version. This tool verifies that your server is protected against downgrade attacks like POODLE.

How to Use

1Enter the server domain or hostname to check.
2Click "Check" to test SCSV support.
3Review whether TLS_FALLBACK_SCSV is supported.
4Take action if SCSV is not supported to prevent downgrade attacks.

Use Cases

•Verify protection against protocol downgrade attacks
•Audit server security for POODLE vulnerability
•Ensure compliance with security best practices
•Validate TLS configuration after server updates

Frequently Asked Questions

It is a Signaling Cipher Suite Value that tells the server to reject fallback attempts to a lower protocol version.

Without SCSV, an attacker can force a downgrade to a weaker protocol version, making attacks like POODLE possible.

Modern servers like OpenSSL 1.0.2+ enable SCSV by default. Check your server config to ensure it's not disabled.

No. SCSV adds negligible overhead to the TLS handshake and has no impact on normal connections.

Tips & Best Practices

•Enable TLS_FALLBACK_SCSV to prevent protocol downgrade attacks
•Verify fallback protection is active after configuration changes
•Test downgrade attack resistance with security scanning tools
•Document fallback protection status for compliance evidence

Technical Details

Protocol: TLS_FALLBACK_SCSV (Signaling Cipher Suite Value) support
Protection: Protocol downgrade attack prevention
Detection: Fallback protection status verification
Output: Fallback SCSV support and configuration status