DNS Gurus
Open Cached · just now
86/100 SECURITY SCORE

Certificate Information

Subject
C=DE, ST=Nordrhein-Westfalen, O=Universität Paderborn, CN=cs.uni-paderborn.de
Issuer
C=NL, O=GEANT Vereniging, CN=GEANT OV RSA CA 4
Valid From
December 09, 2024
Valid Until
December 09, 2025 15 days
Public Key
RSA 4096 bit Strong
Signature Algorithm
SHA384-RSA
SHA-256 Fingerprint
45:19:68:53:1B:55:E6:39:31:47:98:36:32:27:84:14:04:2F:26:D6:57:6A:B4:B5:B8:92:E1:62:8B:E8:7A:A1
Alternative Names
6 domains

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=31556926
Content-Security-Policy
Basic
default-src; font-src; img-src; +3 more
X-Frame-Options
Good
SAMEORIGIN
X-Content-Type-Options
Good
nosniff
Referrer-Policy
Present
same-origin
Permissions-Policy
Missing
Not configured
Recommendations
  • • Increase HSTS max-age to at least 1 year and add includeSubDomains
  • • Improve CSP by adding more specific directives and removing 'unsafe-inline'
  • • Consider adding Permissions-Policy to control browser features

CAA Records (Certificate Authority Authorization)

CAA Records
Configured (Restricts certificate issuance)
Current Issuer
Not Authorized (Potential misconfiguration)
Authorized CAs
letsencrypt.org ; validationmethods=http-01,dns-01 harica.gr
Incident Reporting
CAA Issues
  • • CRITICAL: Current certificate issuer 'C=NL, O=GEANT Vereniging, CN=GEANT OV RSA CA 4' is NOT authorized by CAA records. Authorized CAs: letsencrypt.org;validationmethods=http-01,dns-01, harica.gr
Recommendations
  • • Consider using critical flag (flags=128) for stricter CAA enforcement
  • • Consider adding 'issuewild' records to control wildcard certificate issuance