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just now
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SECURITY SCORE
Certificate Information
Subject
CN=osmo.uk.com
Issuer
C=AT, O=ZeroSSL, CN=ZeroSSL ECC Domain Secure Site CA
Valid From
October 01, 2025
Valid Until
December 30, 2025
52 days
Public Key
ECDSA
256 bit
(P-256)
Adequate
Signature Algorithm
ECDSA-SHA384
SHA-256 Fingerprint
3C:1B:B7:51:EC:CF:9E:89:DD:0A:D4:77:1E:FF:52:44:C7:A1:2B:D9:E8:28:ED:FA:6D:8B:8B:CD:74:39:1F:45
Alternative Names
Security Configuration
TLS Protocols
TLS 1.2
TLS 1.3
Forward Secrecy
Supported
(Modern clients use PFS)
HTTP Security Headers
Status
Strict-Transport-Security
Present
max-age=7889238
Content-Security-Policy
Weak
block-all-mixed-content; frame-ancestors; upgrade-insecure-requests
X-Frame-Options
Excellent
DENY
X-Content-Type-Options
Good
nosniff
Referrer-Policy
Missing
Not configured
Permissions-Policy
Missing
Not configured
Recommendations
- • Increase HSTS max-age to at least 1 year and add includeSubDomains
- • Significantly strengthen CSP directives
- • Add Referrer-Policy header (recommended: strict-origin-when-cross-origin)
- • Consider adding Permissions-Policy to control browser features
CAA Records (Certificate Authority Authorization)
CAA Records
Not Configured
(Any CA can issue certificates)
CAA Issues
- • No CAA records configured - any CA can issue certificates
Recommendations
- • Implement CAA records to restrict which CAs can issue certificates for your domain
- • This adds an extra layer of security against unauthorized certificate issuance
- • Example: Add CAA record 'example.com. CAA 0 issue "letsencrypt.org"'
- • Consider adding 'iodef' record to receive security incident reports