What Is a Website Security Score?
A website security score is a numerical rating (typically out of 100) that evaluates how well your website is protected against common cyber threats. Think of it as a credit score, but for your website's security posture.
The score aggregates dozens of individual checks across categories like SSL/TLS configuration, HTTP security headers, cookie security, DNS settings, and more. Each check earns points when it passes, and the final score gives you an at-a-glance view of where you stand.
Why Your Security Score Matters
43% of cyberattacks target small businesses, and most of these attacks exploit basic misconfigurations that a security scan would catch. A low security score means:
- Your visitors' data may be at risk
- Search engines may penalize your rankings (Google uses HTTPS as a ranking signal)
- You could face compliance issues (GDPR, PCI-DSS)
- Customer trust erodes when browsers show "Not Secure" warnings
A high score, on the other hand, signals to both search engines and visitors that you take security seriously.
What Gets Checked in a Security Score
A comprehensive website security score evaluates these key areas:
### SSL/TLS Configuration (15 points) Your SSL certificate is the foundation. The scan checks: - Certificate validity and expiration - Protocol versions (TLS 1.2+ required, older versions are vulnerable) - Cipher suite strength - HSTS header presence - Certificate chain completeness
### HTTP Security Headers (15 points) These headers tell browsers how to handle your content securely:
Content-Security-Policy: default-src 'self';
X-Content-Type-Options: nosniff
X-Frame-Options: DENY
Strict-Transport-Security: max-age=31536000; includeSubDomains
Referrer-Policy: strict-origin-when-cross-origin
Permissions-Policy: camera=(), microphone=(), geolocation=()
### Cookie Security (10 points)
Session cookies must have proper flags:
- Secure — only sent over HTTPS
- HttpOnly — not accessible via JavaScript
- SameSite — prevents CSRF attacks
### Content Security (15 points) Checks for mixed content, inline scripts, and proper CSP directives that prevent XSS attacks.
### DNS & Email Security (10 points) SPF, DKIM, and DMARC records protect your domain from email spoofing.
### Privacy & Best Practices (10 points) Cookie consent, privacy policy presence, and third-party tracker evaluation.
How to Check Your Score
The fastest way to check your website's security score is with an automated scanner:
- 1Go to ZeriFlow
- 2Enter your website URL
- 3Get your score in about 60 seconds
- 4Review the detailed breakdown by category
ZeriFlow checks 80+ security points across 12 categories and gives you actionable recommendations for each issue found.
How to Improve Your Score
### Quick Wins (5 minutes each)
1. Enable HTTPS everywhere — Get a free SSL certificate from Let's Encrypt
2. Add security headers — Copy the header block above into your server config
3. Set cookie flags — Add Secure; HttpOnly; SameSite=Lax to all cookies
### Medium Effort (30 minutes)
4. Configure CSP — Start with Content-Security-Policy: default-src 'self' and add exceptions as needed
5. Set up SPF/DKIM/DMARC — Add DNS records to prevent email spoofing
6. Enable HSTS — Add the Strict-Transport-Security header
### Deeper Improvements (1-2 hours) 7. Remove mixed content — Ensure all resources load over HTTPS 8. Audit third-party scripts — Remove unnecessary trackers and analytics 9. Update server software — Patch your web server, CMS, and plugins
Track Your Progress
Security is not a one-time task. Websites change, new vulnerabilities are discovered, and certificates expire. Run a security scan at least monthly to catch regressions early.
With ZeriFlow's Pro plan, you get unlimited quick scans and advanced scans that check even more security points, helping you maintain a high score consistently.
Conclusion
Your website security score is a clear, actionable metric that tells you exactly where your defenses are strong and where they need work. Start by running a free scan, fix the quick wins first, then work your way through the recommendations. Most sites can go from a score in the 30s to 80+ in a single afternoon.
Check your website's security score now — it takes less than 60 seconds.