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Security report for euler.finance

Euler Finance · Finance · N/a

Low risk. 3 critical or high findings in GDPR outside view and SSL/TLS.

Security score

81/100

Risk levelLow

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

Euler Finance operates as a modular decentralized finance (DeFi) lending platform enabling users to lend, borrow, and build custom lending vaults without limits. The platform targets DeFi users and developers, offering advanced features such as the Ethereum Vault Connector and Euler Vault Kit to empower builders in the blockchain ecosystem. Euler positions itself as a lending super app with a strong developer focus and a growing community. Technically, the website is built on modern frameworks including Next.js and Material UI, delivering excellent performance and mobile optimization. Security posture is strong with HTTPS enforced and a substantial security bounty program valued at $7.5 million, indicating a proactive approach to vulnerability management. However, the absence of explicit privacy and cookie policies and contact information represents compliance gaps. Overall, Euler Finance demonstrates a mature digital presence with robust technical and security foundations but should enhance privacy compliance and transparency to further strengthen trust and regulatory adherence.

Scanned

NIS2 and GDPR posture

GDPR outside view
58/ 100 · Medium
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

3 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.

    • High

      No Cookie Policy found

      GDPR requires clear information about cookie usage

      What to do: Add a dedicated cookie policy explaining cookie usage and purposes

    • High

      No Cookie Consent Banner found

      GDPR requires explicit consent for non-essential cookies

      What to do: Implement a cookie consent banner that appears on first visit

  2. SSL/TLS

    TLS encrypts the connection and proves the site is really yours. Weak or expiring certificates trigger browser warnings and put traffic at risk.

    • High

      Weak SSL Key Length

      SSL certificate uses 256-bit key, which is considered weak

      What to do: Use at least 2048-bit RSA or 256-bit ECC key

      • CWE-326
      • OWASP A04:2025
      • Mozilla TLS: Mozilla Server Side TLS 6.0 intermediate: rsa_key_size 2048

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Keep watching euler.finance

This scan found 14 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

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

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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
75
Security headers
80
Email security
85
DNS health
90
Network security
100
GDPR outside view
58
Average
81

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

Euler Finance is positioned in the competitive DeFi lending market with innovative modular vault technology allowing custom lending protocols and token swaps. Its business model leverages decentralized finance principles, targeting crypto asset holders and developers seeking flexible lending solutions. The platform's partnership with security firms and active GitHub presence supports its credibility and growth potential. Revenue streams likely include lending fees and protocol incentives. The target audience includes DeFi users, developers, and institutional participants interested in advanced lending and borrowing capabilities. Euler's ecosystem includes community engagement via Discord and extensive documentation, fostering developer adoption and platform expansion.

Security posture

Euler Finance exhibits a strong security posture with HTTPS enforced and a high-value bug bounty program incentivizing vulnerability reporting. The website does not expose sensitive data and uses modern libraries without known vulnerabilities. However, the lack of published security policies, incident response contacts, and comprehensive privacy and cookie policies indicates areas for improvement. Compliance with GDPR and other data protection regulations is not clearly demonstrated. The platform should implement recommended security headers such as Content-Security-Policy and X-Frame-Options to enhance protection against common web attacks. Overall, Euler shows a proactive security culture but should formalize policies and improve transparency to meet best practices fully.

Recommendations

  1. Publish comprehensive privacy and cookie policies with clear GDPR compliance statements.
  2. Implement and enforce security headers including Content-Security-Policy, X-Frame-Options, and X-Content-Type-Options.
  3. Provide explicit contact information for security incident reporting and data protection inquiries.
  4. Enhance transparency by publishing a formal security policy and incident response plan.
  5. Regularly audit and update third-party libraries and dependencies to mitigate vulnerabilities.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Euler Finance
Description
Euler is a modular lending platform that enables users to lend, borrow and build without limits.
Key services
Lending and borrowing of crypto assets, Custom vault creation and deployment, Token and vault swapping, Developer tools: Euler Vault Kit (EVK) and Ethereum Vault Connector (EVC)
Content quality
excellent
Branding
consistent

Technology

Stack
React, Next.js, Material UI, Font Awesome 6, Google Fonts, Video embedding (mp4, webm)
Frameworks
Next.js, Material UI
Platforms
Ethereum blockchain (implied by DeFi context)
Performance
fast
Mobile
excellent
Accessibility
good
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • Security bounty program
  • No exposed sensitive data in HTML
  • No vulnerable libraries detected

Analytics and tracking

Tracking level
minimal
Privacy practices
poor

Advertising

Transparency
poor

Site quality

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

Key observations

  1. Website is a professional DeFi lending platform with modular vaults and token swapping.
  2. No contact emails or phone numbers explicitly found in the HTML content.
  3. No privacy, cookie, or terms of service policies explicitly found or linked.
  4. Strong developer focus with GitHub and documentation links.
  5. Security bounty program prominently displayed with a large reward.
  6. No signs of adult or questionable content.
  7. No WAF or blocking mechanisms detected.
  8. WHOIS data is privacy protected and incomplete.
Technical notes

Notes

The website leverages a modern technology stack featuring React and Next.js frameworks, combined with Material UI for consistent styling and Font Awesome for iconography. It uses Google Fonts for typography and supports video content for rich user experience. The site is mobile-optimized and performs well with fast loading times. No CMS is detected, indicating a custom-built solution. Hosting provider details are not explicit but the site uses HTTPS with a strong SSL configuration. The technical implementation reflects a mature and well-maintained infrastructure suitable for a fintech/DeFi platform. Opportunities exist to improve accessibility features and SEO metadata further.
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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