SSL Certificate Analysis for tw.buy.yahoo.com - Security Grade & TLS Configuration

Open Cached · just now

89/100 SECURITY SCORE

Certificate Information

Subject

C=US, ST=New York, L=New York, O=Yahoo Holdings Inc., CN=ystore.tw

Issuer

C=US, O=DigiCert Inc, CN=DigiCert Global G2 TLS RSA SHA256 2020 CA1

Valid From

November 18, 2025

Valid Until

May 13, 2026 175 days

Public Key

ECDSA 256 bit (P-256) Adequate

Signature Algorithm

SHA256-RSA

SHA-256 Fingerprint

A8:31:3C:49:4C:F8:B0:CA:30:3E:EB:22:BE:88:A6:A7:36:08:89:AA:2D:9A:78:9B:9A:E6:6A:55:B3:58:B0:EB

Alternative Names

87 domains

Security Configuration

TLS Protocols

TLS 1.0 TLS 1.1 TLS 1.2 TLS 1.3

Forward Secrecy

Supported (Modern clients use PFS)

Warnings

• TLS 1.1 is deprecated and should be disabled
• TLS 1.0 is deprecated and should be disabled

HTTP Security Headers

Status

Strict-Transport-Security

Present

max-age=31536000

Content-Security-Policy

Basic

default-src; frame-src; frame-ancestors; +5 more

X-Frame-Options

Good

SAMEORIGIN

X-Content-Type-Options

Good

nosniff

Referrer-Policy

Good

no-referrer-when-downgrade

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

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