What Is a Website Security Score? How to Check & Improve Yours

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.

<div class="zf-stat-callout" style="background:#0d1117;border:1px solid rgba(16,185,129,0.25);border-left:3px solid #10b981;border-radius:4px;padding:16px 20px;margin:24px 0"> <p style="margin:0 0 4px;font-size:10px;font-weight:700;text-transform:uppercase;letter-spacing:0.15em;color:#10b981;font-family:monospace">ZeriFlow Data — 12,400+ sites analyzed</p> <p style="margin:0;font-size:13px;color:#e2e8f0;line-height:1.6;font-family:monospace">Across 12,400+ sites in our scan corpus, 29% still accept TLS 1.1 connections — a protocol deprecated by RFC 8996 in March 2021 and flagged as insecure by every major browser.</p> </div>

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:

1. 1Go to ZeriFlow
2. 2Enter your website URL
3. 3Get your score in about 60 seconds
4. 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.

Further Reading

• Mozilla SSL Configuration Generator
• RFC 8996 — Deprecating TLS 1.0 and TLS 1.1

<!-- zf-internal-links -->