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Security report for yearn.fi

Yearn · Finance · N/a

Medium risk. 10 critical or high findings in GDPR outside view, Email security and 3 other checks.

Security score

54/100

Risk levelMedium

0–100, higher is better. How it is calculated

Yearn is a prominent decentralized finance (DeFi) platform specializing in yield aggregation through compounding vaults and a growing app ecosystem. Founded in 2020, it targets cryptocurrency investors seeking optimized yield opportunities. The platform is well-positioned in the DeFi market with a strong community and multiple partner integrations enhancing its ecosystem. Technically, Yearn employs a modern web stack including Next.js and React, hosted likely behind Cloudflare DNS services. The website is fast, mobile-optimized, and provides a professional user experience. Analytics usage is minimal, relying on privacy-focused tools like Plausible. From a security perspective, Yearn demonstrates maturity with audited smart contracts and an active bug bounty program. However, the website lacks explicit privacy and cookie policies, security headers, and direct contact information, which are areas for improvement. No vulnerabilities or suspicious patterns were detected in the WHOIS data, which shows privacy protection typical for crypto projects. Overall, Yearn presents a low-risk profile with strong business credibility and technical implementation. Strategic enhancements in privacy compliance and security headers would further strengthen trust and compliance posture.

Scanned

NIS2 and GDPR posture

GDPR outside view
25/ 100 · Critical
Checks completed
7of 7

NIS2 Art. 21(2)

  1. (a) Risk analysis and security policies: Not visible from outside
  2. (b) Incident handling: One indicator
  3. (c) Business continuity, backups and crisis management: Not visible from outside
  4. (d) Supply chain security: Not visible from outside
  5. (e) Secure acquisition, development and maintenance, including vulnerability handling: Partly checked
  6. (f) Assessing the effectiveness of security measures: Not visible from outside
  7. (g) Cyber hygiene and security training: Not visible from outside
  8. (h) Cryptography and encryption: Partly checked
  9. (i) HR security, access control and asset management: One indicator
  10. (j) Multi-factor authentication and secured communications: Not visible from outside

This scan rated NIS2 with an earlier keyword method that is no longer shown; rescan for the per-article view. Risk management, continuity, supply chain, training, MFA, management oversight (Art. 20) and incident reporting (Art. 23) need internal evidence, and Guard cannot tell whether NIS2 applies to this organisation.

GDPR is indicative only, based on publicly visible signals: Articles 7, 12, 13 and 32 of Regulation (EU) 2016/679 and Article 5(3) of the ePrivacy Directive. Not a certification or legal assessment.

Priority findings

10 findings rated critical or high. Fix these first.

  1. GDPR outside view

    These are the privacy signals visitors and data protection authorities look for under GDPR.

    • Critical

      EU business without adequate privacy measures

      EU businesses are subject to strict GDPR requirements

      What to do: Implement comprehensive GDPR compliance including privacy policy, cookie consent, and data protection measures

    • High

      No Privacy Policy found

      GDPR requires a clear and accessible privacy policy

      What to do: Add a comprehensive privacy policy page and link to it prominently

  2. Email security

    SPF, DKIM and DMARC stop others sending email that looks like it comes from your domain, a common route to phishing and invoice fraud.

    • Critical

      No email authentication configured

      Domain is vulnerable to email spoofing

      What to do: Implement SPF, DKIM, and DMARC immediately

  3. Security headers

    Security headers are instructions your web server sends to every visitor’s browser. Missing ones leave visitors more exposed to attacks such as clickjacking and injected scripts.

    • High

      Missing X-Frame-Options header

      Prevents clickjacking attacks

      What to do: Add "X-Frame-Options: DENY" or "X-Frame-Options: SAMEORIGIN"

    • High

      Missing Content-Security-Policy header

      Controls resources the browser is allowed to load

      What to do: Implement a Content-Security-Policy appropriate for your application

      • ASVS V3.4.3
      • OWASP Secure Headers: OWASP Secure Headers Project recommends Content-Security-Policy: default-src 'self'; form-action 'self'; base-uri 'self'; object-src 'none';…

Need hands-on remediation? Email guard@offseq.com

Keep watching yearn.fi

This scan found 27 issues across 6 checks. Monitoring re-runs those checks daily, emails you when something material changes and records each fix, so you can show progress.

Daily monitoring

Recommended

€25per month

  • TLS certificates and expiry
  • DNS records
  • SPF, DKIM and DMARC
  • Security headers
  • GDPR and NIS2 posture
  • Exposed services
  • Third-party trackers
  • Security score drift

Email alerts on material changes and an exportable JSON history of every change.

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Full report

€39.90one-time

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Prices incl. 21% VAT. Secure checkout by Mollie; sold by SEQ SIA, Latvia.

Results by check

Each check with its score, findings and the evidence it collected.

How this score is calculated

The security score runs 0–100, higher is better. It is the plain average of the security checks that completed in this scan, each counted equally. A check that could not run is left out: it counts neither as a pass nor as a fail.

Counted in this score

SSL/TLS
72
Security headers
30
Email security
40
DNS health
55
Network security
100
GDPR outside view
25
Average
54

Not counted

  • NIS2 outside view: Re-weights evidence from the TLS, email, DNS, network and hygiene checks, so counting it would count that evidence twice. Shown on its own.
  • OffSeq Observations: An AI reading of the site, useful context but not reproducible evidence. Shown on its own.

Findings that cap the score at 49

Each of these is serious on its own, so while any is present the site cannot rate better than high risk, however good the other checks are.

  • The certificate is not trusted by browsers
  • The website is not served over HTTPS
  • A database, remote desktop, file-sharing or Telnet service is reachable from the internet
  • The page loads a script from a compromised source
  • The domain registration has expired
  • SPF authorises every server to send mail as the domain

Partial scans

When the site blocks Guard or most checks cannot run, the score covers only the checks that ran (usually DNS and email), is capped at 75 and is shown as partial, without a risk level.

Risk levels

  • Critical0–25
  • High26–49
  • Medium50–75
  • Low76–100

Technical appendix

Business context, site observations and technical notes gathered during the scan, and the standards behind each reference.

Business context

Business profile

Yearn operates as a decentralized finance yield aggregator, leveraging compounding vaults and community-built apps to provide optimized returns on digital assets. Its business model is based on aggregating yield opportunities and offering them through a user-friendly interface. The platform has established a robust partnership ecosystem with multiple DeFi projects and integrations, enhancing its market reach and service offerings. The target customers are crypto investors and DeFi users seeking efficient yield strategies. Yearn's competitive advantage lies in its battle-tested vaults, security audits, and active community governance. The project shows indicators of growth and ecosystem expansion through continuous partner collaborations.

Security posture

Yearn exhibits a mature security posture with audited smart contracts and a public bug bounty program hosted on Immunefi, signaling proactive vulnerability management. The website enforces HTTPS and avoids exposing sensitive data. However, it lacks several recommended security headers such as Content Security Policy (CSP) and HTTP Strict Transport Security (HSTS), which could mitigate certain web-based attacks. The absence of explicit privacy and cookie policies may pose compliance risks under GDPR and similar regulations. Incident response contact details are not publicly available, which could delay vulnerability reporting. Overall, the security maturity is good but can be improved by implementing comprehensive security headers and publishing clear privacy and incident response policies.

Recommendations

  1. Implement and publish a comprehensive privacy policy and cookie policy to enhance GDPR compliance and user trust.
  2. Add essential security headers including Content Security Policy (CSP), HTTP Strict Transport Security (HSTS), and X-Frame-Options to strengthen web security.
  3. Provide clear and accessible contact information for security incidents and data protection inquiries to improve incident response readiness.
  4. Regularly review and update third-party integrations and dependencies to avoid vulnerabilities from external sources.
  5. Enhance transparency by including terms of service and data retention policies to align with best practices and regulatory requirements.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Yearn
Description
Yearn is DeFi's Yield Aggregator offering compounding vaults and an app ecosystem for digital asset yield optimization.
Key services
Compounding Vaults, App Ecosystem, Partner Integrations
Content quality
excellent
Branding
consistent

Technology

Stack
React, Next.js, Cloudflare DNS, JavaScript, CSS
Frameworks
Next.js
Performance
fast
Mobile
excellent
Accessibility
good
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • Bug bounty program
  • Audited smart contracts

Analytics and tracking

Services
Plausible Analytics
Tracking level
minimal
Privacy practices
poor

Advertising

Tracking pixels
plausible
Transparency
basic

Site quality

Design
excellent
User experience
excellent
Content relevance
excellent
Navigation
excellent
Professionalism
excellent
Trustworthiness
high

Key observations

  1. Website is fully accessible with no blocking or WAF challenges.
  2. No explicit privacy, cookie, or terms of service policies found on the main page.
  3. No direct contact emails or phone numbers found on the homepage.
  4. Strong emphasis on security with audits and bug bounty programs linked.
  5. Multiple partner and integration domains listed, indicating ecosystem maturity.
  6. Modern tech stack with Next.js and Cloudflare DNS usage.
  7. Good mobile optimization and user experience.
  8. Minimal user tracking with plausible analytics only.
  9. No signs of adult or questionable content.
Technical notes

Notes

The website is built using modern web technologies including React and Next.js, ensuring server-side rendering and fast performance. Hosting appears to be supported by Cloudflare DNS services, contributing to reliability and security. The site is fully responsive with excellent mobile optimization and accessibility features. SEO is well addressed through proper meta tags and Open Graph data. The use of minimal analytics (Plausible) reflects a privacy-conscious approach. No CMS was detected, indicating a custom or static site generation approach. The technical infrastructure is robust with low technical debt, but security headers should be added to mitigate potential web vulnerabilities.
Standards and sources

Reference chips under each finding point to the standard, regulation or specification the finding relates to. They are taken from the official datasets below and mapped conservatively: a finding with no defensible link shows none. NIS2 and GDPR references mark where a finding is relevant evidence, not a compliance verdict. Implementing Regulation (EU) 2024/2690 binds digital infrastructure and digital service providers; for other entities it is the most detailed public reading of the Article 21 measures. WCAG, EN 301 549, European Accessibility Act and Web Accessibility Directive references name the requirement an automated accessibility rule relates to; they are not a conformance verdict.

Retrieved 2026-10-25

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