A media literacy course for security data, not a product tour. What a severity score, such as one computed under the Common Vulnerability Scoring System (CVSS), is built to measure and what it deliberately leaves out, including exploitation and reachability in your own environment. Exploit prediction, exemplified by the Exploit Prediction Scoring System (EPSS), read as a probability rather than a verdict in either direction. A known exploited catalogue, such as the Known Exploited Vulnerabilities (KEV) catalogue, read as a different question entirely: not how bad could this be, but is this already happening. Weakness taxonomy, such as the Common Weakness Enumeration (CWE), used for grouping and pattern spotting rather than ranking importance. The absence of evidence fallacy named directly, with a concrete habit to counter it. The course closes with a general habit for reading any security metric: what it measures, how it was collected, and how stale it might be, before it changes what you do next.
Nothing. Every course, exam, and certificate on the catalog is free — including retakes. All you need is a free Safeguard account.
None. The flagship course, Safeguard Certified Practitioner, is a beginner-level course — basic familiarity with how software is built helps, but every exam question is answerable from the lessons themselves.
You can retake it after a 24-hour cooldown, as many times as you need. Retakes are free, and each attempt draws a fresh random set of questions.
The Safeguard Certified Practitioner credential is valid for 24 months from issue. The expiry date is printed on the certificate and shown live on its public verification page. Renewing means passing the current exam again.
