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Security report for vonovia.com

Vonovia SE · Real Estate · Germany

Low risk. 3 critical or high findings in Email security and SSL/TLS.

Security score

76/100

Risk levelLow

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

Vonovia SE is a large enterprise operating in the real estate sector primarily in Germany. The company manages residential properties and offers related services to tenants and partners. The website serves as a corporate portal providing information about the company, its subsidiaries, and services. The site is professionally designed with consistent branding and targets a broad audience including tenants, investors, and partners. Technically, the website employs modern web technologies including JavaScript, CSS3, and uses Cookiebot for GDPR-compliant cookie consent management. Analytics tools such as econda and Google services are used for traffic analysis and marketing optimization. The site is mobile-optimized and has good SEO practices, although accessibility features are basic. From a security perspective, the website enforces HTTPS and implements cookie consent mechanisms, but lacks explicit security headers and published security policies. No vulnerabilities or exposed sensitive data were detected in the provided content. The absence of WHOIS data reduces domain trust slightly, but the overall security posture is good. Overall, the website is a professional and trustworthy corporate site with moderate technical maturity and good privacy compliance. Strategic improvements include publishing privacy and security policies, enhancing security headers, and establishing a vulnerability disclosure program to further strengthen trust and compliance.

Scanned

NIS2 and GDPR posture

GDPR outside view
88/ 100 · Low
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. 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

    • High

      No SPF record found

      SPF helps prevent email spoofing

      What to do: Add SPF record: "v=spf1 include:_spf.yourmailprovider.com ~all"

  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 Protocols Supported

      Server supports weak protocols: TLSv1.1

      What to do: Disable TLS 1.0, TLS 1.1, and all SSL versions

      • CWE-327
      • OWASP A04:2025
      • ASVS V12.1.1

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

Keep watching vonovia.com

This scan found 19 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

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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
72
Security headers
85
Email security
40
DNS health
70
Network security
100
GDPR outside view
88
Average
76

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

Vonovia SE holds a strong market position as a leading real estate company in Germany with multiple subsidiaries such as Deutsche Wohnen and Vonovia Sozialstiftung. The business model focuses on property management and tenant services, generating revenue through rental income and property services. The company targets residential tenants, investors, and corporate partners. The presence of multiple related domains and subsidiaries indicates a broad partnership ecosystem. The website content and structure reflect a mature organization with a focus on compliance and customer engagement. Growth indicators include the use of advanced analytics and marketing tools, and the integration of cookie consent mechanisms to comply with GDPR. The company’s digital presence supports its business operations and stakeholder communications effectively.

Security posture

The website demonstrates a good security maturity level with HTTPS enforced and a comprehensive cookie consent mechanism via Cookiebot. No critical vulnerabilities or exposed sensitive data were found. However, the lack of explicit security headers such as Content Security Policy (CSP), HTTP Strict Transport Security (HSTS), and X-Frame-Options represents an area for improvement. There is no visible security policy or incident response contact information, which limits transparency and readiness for security incidents. Compliance with GDPR is indicated by the cookie consent banner and cookie classification, but the absence of a clear privacy policy link reduces compliance confidence. The WHOIS data unavailability is a minor concern for domain legitimacy verification. Overall, the security posture is solid but could be enhanced by publishing security policies and implementing additional HTTP security headers.

Recommendations

  1. Implement and publish a comprehensive privacy policy and terms of service on the website.
  2. Add security headers including Content Security Policy (CSP), HSTS, and X-Frame-Options to improve protection against common web attacks.
  3. Establish and publicize a vulnerability disclosure program or security.txt file to encourage responsible reporting of security issues.
  4. Provide clear incident response contact information such as security@ or abuse@ email addresses.
  5. Enhance accessibility features to improve compliance with accessibility standards and broaden user inclusivity.

Contact details published on the site

Addresses
Legal name
Vonovia SE
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Vonovia SE
Description
Vonovia Konzernwebsite
Key services
Real estate management, Property services, Tenant services
Content quality
good
Branding
consistent

Technology

Stack
JavaScript, Cookiebot, econda analytics, HTML5, CSS3
Performance
moderate
Mobile
good
Accessibility
basic
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • Cookie consent mechanism implemented
  • No exposed sensitive data detected

Analytics and tracking

Services
econda, Google Analytics (implied via Google scripts)
Tracking level
moderate
Privacy practices
good

Advertising

Ad networks
Google
Tracking pixels
Cookiebot
Marketing tools
Google Ads, YouTube
Transparency
good

Site quality

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

Key observations

  1. Website is fully accessible with no blocking or WAF challenge.
  2. Comprehensive cookie consent mechanism implemented via Cookiebot.
  3. No explicit privacy policy or terms of service links found in provided HTML snippet.
  4. Contact information includes phone number and physical address in Germany.
  5. Multiple related domains and subsidiaries referenced in cookies and links.
  6. Use of modern JavaScript and analytics tools.
  7. No security.txt or vulnerability disclosure information found.
  8. WHOIS data unavailable, limiting domain registration trust verification.
Technical notes

Notes

The website uses a modern technology stack with JavaScript, CSS3, and third-party services like Cookiebot for consent management and econda for analytics. The site is mobile-optimized and has good SEO metadata including Open Graph tags and JSON-LD structured data for organization details. Hosting provider and CMS are not explicitly identified from the provided data. Performance is moderate with deferred and async script loading. There is room for technical improvement by adding more robust security headers and enhancing accessibility. The absence of CMS identification suggests a custom or proprietary platform. Overall, the technical infrastructure supports a professional corporate website with standard compliance and analytics capabilities.
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

Earlier scans of this domain

  1. 76/100Low26 findingsView report
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