description Qualys SSL Labs SSL Server Test Overview
The Qualys SSL Labs SSL Server Test evaluates a website's Secure Socket Layer (SSL) or Transport Layer Security (TLS) configuration. It identifies potential vulnerabilities and assesses compliance with security standards. This tool is valuable for IT professionals, web developers, and security analysts responsible for maintaining secure online communication channels.
help Qualys SSL Labs SSL Server Test FAQ
How does the Qualys SSL Labs test grade a website's security?
The Qualys SSL Labs test assigns a letter grade from A+ to F based on the certificate's chain of trust, the strength of the cryptographic key, and the server's support for modern protocols like TLS 1.3. It penalizes servers heavily for supporting deprecated, vulnerable protocols like SSL 3.0.
Does the Qualys SSL Labs test detect the Heartbleed vulnerability?
Yes, the test actively checks the server's OpenSSL implementation against known critical vulnerabilities like Heartbleed (CVE-2014-0160), ROBOT, and DROWN. If any of these severe vulnerabilities are detected, the server will automatically fail the test.
What score do you need to get an A+ rating on the Qualys SSL Server Test?
To achieve an A+ rating, a website must score 100 out of 100 on the SSL Labs grading curve. This requires a flawless certificate chain, perfect forward secrecy, HSTS enabled, and absolutely no support for outdated TLS versions.
How often does Qualys update their SSL Labs rating criteria?
Qualys regularly updates the grading algorithm to reflect current industry security standards, often releasing major changes annually. For example, they updated their criteria in early 2020 to lower the grades of servers that did not support TLS 1.3.
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