WAF – WEB APPLICATION FIREWALL

WAF: Sophos vs. OPNsense – Protection for your web applications

Sophos SFOS WAF (reverse proxy) versus OPNsense with ModSecurity and OWASP CRS – we choose the optimal protection level for your web applications.

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OWASP Top 10: SQLi & XSS

OPNsense CrowdSec IPS

Sophos Central Cloud Management

ModSecurity & OWASP CRS

Virtual patches for CVEs

GDPR-compliant logging

ENTERPRISE WAF

Sophos SFOS WAF

Sophos SFOS WAF as a reverse proxy with integrated Deep Packet Inspection, automatic signature updates via Sophos Labs, and centralized cloud management via Sophos Central – enterprise-ready, highly available, and GDPR-compliant.

OPEN-SOURCE WAF

OPNsense + ModSecurity + CrowdSec

OPNsense with ModSecurity, OWASP Core Rule Set (CRS), and CrowdSec Community IPS – centrally managed via our managed portal. Full OWASP protection plus community threat intelligence without license costs, flexibly adaptable, and GDPR-compliant.

WAF & Web Application Security

Sophos SFOS WAF in detail – Reverse Proxy, OWASP Protection & ModSecurity

OWASP Top 10: SQL injection, XSS, CSRF, RCE, and more

Expertise in Sophos SFOS WAF and OPNsense ModSecurity

Sophos SFOS

ModSecurity

OWASP CRS

Reverse Proxy

TLS Inspection

SQL Injection Protection

XSS Protection

WAF COMPARISON: SOPHOS VS. OPNSENSE

Why our WAF concept is convincing

Maximum protection for web applications – commercial with Sophos or open source with OPNsense.

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OWASP Top 10 Coverage

Sophos SFOS WAF

OPNsense ModSecurity + CrowdSec

Virtual Patches

TLS Inspection & Reverse Proxy

GDPR-compliant Logging

SOPHOS WAF

Sophos SFOS WAF

Sophos SFOS WAF (reverse proxy) offers automatic signature updates, SSL/TLS termination, and centralized management via Sophos Central – scalable, enterprise-ready, and with dedicated support.

OPNSENSE

OPNsense + ModSecurity + CrowdSec

OPNsense uses ModSecurity with OWASP Core Rule Set and CrowdSec Community IPS – centrally managed via our managed service portal. Full OWASP Top 10 protection plus community threat intelligence, without license costs and audit-ready.

VIRTUAL PATCHES

Virtual Patches & CVE Protection

Known vulnerabilities are immediately covered by virtual patches – even if the application itself has not yet been updated.

WAF Features: Sophos SFOS vs. OPNsense

OPNsense: ModSecurity & OWASP CRS

OPNsense uses ModSecurity with the OWASP Core Rule Set: SQL injection, XSS, RFI, and other Top 10 attacks are reliably blocked – free and open source.

Sophos Labs: Virtual Patches & Signatures

Sophos Labs delivers continuously updated WAF signatures and virtual patches – known CVEs are covered immediately before app updates are available.

OPNsense: HAProxy & Caddy as WAF Frontend

OPNsense combines HAProxy or Caddy as a reverse proxy frontend with ModSecurity – for flexible WAF deployment in the cloud and on-premise without license costs.

Sophos SFOS – OPNsense – Web App Protection

WAF in Cloud & Hybrid Environments

Expose web applications securely – on-premise and cloud

From Sophos Central cloud management to OPNsense in OpenStack – WAF for every infrastructure type, GDPR-compliant.

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OWASP Top 10 Risks

Stop SQL Injection, XSS & CSRF

Without a WAF, web applications are directly exposed to OWASP Top 10 attacks. A WAF filters malicious HTTP requests before they reach the application.

Sophos Central WAF

Sophos SFOS: Centralized Cloud Management

Manage all Sophos WAF instances centrally via Sophos Central – with real-time alerting, rule management, signature updates, and compliance reporting.

OPNsense in the Cloud

OPNsense WAF in OpenStack & Azure

OPNsense as a VM in OpenStack or Azure: ModSecurity protects exposed web applications there without license costs – ideal for private and hybrid cloud environments.

WAF Comparison: Sophos SFOS and OPNsense at a Glance

WAF Security – All Features

Full protection of your web applications – commercial with Sophos SFOS or open source with OPNsense ModSecurity.

Sophos SFOS WAF

Native Web Application Firewall integrated directly on the Sophos XGS Firewall (SFOS) – reverse-proxy-based Layer 7 protection without a separate appliance, centrally managed via Sophos Central and synchronized with other Sophos modules.

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Video: Setting up Sophos Firewall WAF (Sophos Techvids)

Sophos WAF

OPNsense + ModSecurity

Open-source WAF with ModSecurity and OWASP Core Rule Set – full OWASP protection, free and fully customizable. For Layer 7 application control beyond pure WAF rules, we optionally supplement OPNsense with Zenarmor (paid module with DPI-based app recognition, cloud threat intelligence, and granular user/group policies).

ModSecurity

OWASP Top 10 Protection

SQL injection, XSS, CSRF, RCE, path traversal, and other OWASP attacks are detected and blocked.

OWASP Top 10

Virtual Patches

Known CVEs are immediately covered by virtual WAF patches – without waiting for application updates.

Virt. Patches

Reverse Proxy & Load Balancing

Both Sophos SFOS and OPNsense terminate TLS centrally at the reverse proxy and distribute requests to multiple backend servers – with health checks and automatic failover.

Reverse Proxy

HAProxy & Caddy (OPNsense)

OPNsense uses HAProxy or Caddy as a flexible WAF frontend – combined with ModSecurity for full application protection.

HAProxy/Caddy

Sophos Central Management

Centralized management of all WAF instances: real-time alerting, rule maintenance, and automatic signature updates via Sophos Central.

Sophos Central

GDPR & Compliance Logging

Full logging of all web requests – data protection compliant, audit-proof, and with configurable retention periods.

GDPR

Secure WAF protection now

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Gabler Systemtechnik GmbH
Scheidegger Strasse 8
81476 Munich

T.: 089 / 416 02 113

Mobile: +49 151 20795000

Email: hello@gablersystemtechnik.com

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Was ist eine Web Application Firewall und wovor schützt sie?

Eine WAF schützt Webanwendungen vor gezielten Angriffen wie SQL-Injection, Cross-Site Scripting, CSRF und Remote Code Execution. Sie analysiert HTTP/HTTPS-Traffic zwischen Internet und Anwendung und blockiert bösartige Anfragen, bevor sie die Anwendung erreichen.

Was ist der Unterschied zwischen Sophos SFOS WAF und OPNsense ModSecurity?

Sophos SFOS WAF arbeitet als Reverse Proxy mit proprietären Sophos-Labs-Signaturen und Cloud-Management über Sophos Central – enterprise-ready und GDPR-compliant. OPNsense setzt auf ModSecurity mit dem OWASP Core Rule Set: vollständiger Open-Source-Schutz ohne kommerzielle Lizenz, frei anpassbar.

Welche Angriffstypen erkennt eine WAF?

Eine WAF erkennt alle OWASP-Top-10-Angriffe: SQL-Injection, Cross-Site Scripting, CSRF, Remote File Inclusion, Path Traversal und Remote Code Execution. Sophos ergänzt diese Basisabwehr mit virtuellen Patches und automatischen Signatur-Updates über Sophos Labs.