Overview
Findings
Actions
Details
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AI-Generated Summary
What this means
semrush.com scored 92/100, demonstrating a strong security posture. Minor improvements are noted below.
Positive signals: MX Records & Mail Provider, TLS Protocol Support, TLS Configuration all passed.
2 action items identified, including 0 critical. The issues are configuration gaps, not architectural problems. A focused remediation effort of 2–5 days could address all findings.
How semrush.com compares
Grade distribution across 2598 companies we've scanned. semrush.com scores better than 92% of them.
83
A+
25
A
190
A-
196
B+
75
B
362
B-
129
C+
114
C
330
C-
119
D+
95
D
252
D-
628
F
semrush.com — Grade A- (92/100)
2598 companies scanned
Security checks
Each check inspects a different part of semrush.com's public security setup. Green means healthy, yellow needs attention, red is a problem.
MTA-STS & TLS Reporting
Issues: No MTA-STS configured — email in transit is vulnerable to TLS downgrade attacks. Sending servers cannot verify that your mail server requires TLS; No TLSRPT record — TLS delivery failures won't be reported to domain owner.
DNS CAA Records
Strengths: CAA records configured (11 record(s)); Authorized CAs: amazon.com, sectigo.com, comodoca.com, digicert.com, pki.goog, globalsign.com, letsencrypt.org. Issues: No iodef record — CA violations won't be reported to the domain owner.
DNS Configuration
Strengths: 4 nameservers configured (ns-cloud-e4.googledomains.com., ns-cloud-e1.googledomains.com., ns-cloud-e3.googledomains.com., ns-cloud-e2.googledomains.com.); 2 MX records present; Zone transfers properly restricted. Issues: DNSSEC not configured — DNS responses can be spoofed.
Security Headers
3/5 security headers present. Missing: CSP, Permissions-Policy.
Cookie Security
Strengths: 2 cookie(s) analyzed; All cookies have Secure flag; All cookies have HttpOnly flag. Issues: 2/2 cookie(s) missing SameSite attribute (PHPSESSID, SSO-JWT).
security.txt (RFC 9116)
No security.txt found. Publishing a security.txt at /.well-known/security.txt is the industry standard (RFC 9116) for vulnerability disclosure policies. Its absence may indicate a less mature security program.
MX Records & Mail Provider
Strengths: Mail handled by Mimecast; 2 MX record(s) configured; Multiple MX records provide redundancy; Equal-priority MX records (5) — standard round-robin load balancing for Mimecast.
TLS Configuration
TLSv1.3 negotiated with TLS_AES_256_GCM_SHA384 (256-bit). Strong configuration with no deprecated protocols or weak ciphers detected.
TLS Protocol Support
Strengths: TLS 1.3 supported; TLS 1.2 supported; TLS 1.3 supported (strongest). Protocol support: TLS 1.3: Yes, TLS 1.2: Yes, TLS 1.1: No, TLS 1.0: No.
HSTS Header
HSTS enabled: max-age=31536000s (365 days) with includeSubDomains and preload. Meets best-practice configuration.
Known Breaches
No known breaches found in public disclosure databases.
CVE Exposure
Detected technologies: nginx, Proxy/CDN. (Proxy/CDN detected but excluded from CVE matching — upstream infrastructure). No version information exposed — CVE matching not possible (this is good practice).
DMARC / Email Security
Strengths: DMARC policy set to quarantine; SPF record present with hard-fail (-all); DKIM configured (selectors: google, s1, s2, k1, mail, mandrill, cm).
Certificate Hygiene
Strengths: Certificate valid, 74 days remaining; Issued by Google Trust Services. Note: Wildcard certificate in use (*.domain) — covers all subdomains. Common practice; worth noting that compromise would affect all subdomains.
Recommended actions
2 items
Steps to improve semrush.com's security grade, ranked by impact.
1
Enable DNSSEC on your domain
Without DNSSEC, DNS responses for semrush.com can be spoofed, potentially redirecting users to malicious sites. This requires coordination with your domain registrar to publish DS records.
Compliance impact
NIST 800-53SC-20
Secure name/address resolution service
How to fix this
1
Check if your DNS provider supports DNSSEC (Cloudflare, Route53, etc.)
2
Enable DNSSEC signing in your DNS provider dashboard
3
Add the DS record to your registrar for .com TLD
4
Verify: dig +dnssec semrush.com
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2
Add optional security headers (CSP, Permissions-Policy)
semrush.com has most security headers configured. Missing: CSP, Permissions-Policy. These are best-practice additions that reduce the attack surface for client-side vulnerabilities.
How to fix this
1
Add a Content-Security-Policy header. Safe starting value (works with Google Fonts and inline styles/scripts): default-src 'self'; style-src 'self' 'unsafe-inline' https://fonts.googleapis.com; font-src 'self' https://fonts.gstatic.com; script-src 'self' 'unsafe-inline'; upgrade-insecure-requests. Test your site after adding it, then tighten over time by removing 'unsafe-inline'.
2
Add: Permissions-Policy: camera=(), microphone=(), geolocation=()
3
Verify with: curl -sI https://semrush.com | grep -iE 'content-security|x-frame|x-content|referrer|permissions'
At a glance
Key data points from the scan.
TLS Version
TLSv1.3
TLSv1.3 negotiated with TLS_AES_256_GCM_SHA384 (256-bit). Strong configuration with no deprecated protocols or weak ciphers detected.
DMARC Policy
p=quarantine
Strengths: DMARC policy set to quarantine; SPF record present with hard-fail (-all); DKIM configured (selectors: google, s1, s2, k1, mail, mandrill, cm).
SPF Record
Present
v=spf1 mx include:_spf.google.com include:usb._netblocks.mimecast.com include:spf.mandrillapp.com in
Security Headers
3/5 present
Missing: CSP, Permissions-Policy
HSTS
Enabled
HSTS enabled: max-age=31536000s (365 days) with includeSubDomains and preload. Meets best-practice configuration.
SSL Certificate
Valid
Strengths: Certificate valid, 74 days remaining; Issued by Google Trust Services. Note: Wildcard certificate in use (*.domain) — covers all subdomains. Common practice; worth noting that compromise would affect all subdomains.
DNSSEC
Not enabled
Strengths: 4 nameservers configured (ns-cloud-e4.googledomains.com., ns-cloud-e1.googledomains.com., ns-cloud-e3.googledomains.com., ns-cloud-e2.googledomains.com.); 2 MX records present; Zone transfers properly restricted. Issues: DNSSEC not configured — DNS responses can be spoofed.