Platform/Attack Surface Monitoring
External Surface

External Attack Surface Monitoring (EASM)

Continuously map your external digital footprint to uncover forgotten subdomains, shadow IT marketing sites, exposed databases, and expiring TLS certificates before attackers find them.

Business Outcome:Eliminate 'shadow IT' surprises when a marketing agency spins up an unpatched microsite or a developer leaves a test server open.
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Asset discovery
Automated CT & DNS
Drift alerting
Real-time notifications
Shadow IT visibility
100% external view
Example DetectionCritical
Legacy Staging Subdomain (staging-portal.company.co.uk) Exposing Debug Panel

Staging environment shares production database structure and exposes environment variables via debug stack trace.

Verified Remediation Guidance:
# Restrict staging access behind Cloudflare Zero Trust / IP allowlist
# And disable debug flags in non-local environments:
APP_DEBUG=false
APP_ENV=staging

What Attack Surface Monitoring Detects

Every check is non-destructive, rate-limited, and verified to eliminate false-positive noise.

  • Newly registered or forgotten subdomains (e.g., old-crm.company.co.uk, dev-api.company.co.uk)
  • Exposed network services (SSH, RDP, Jenkins, phpMyAdmin, Elasticsearch, Kibana, Docker daemons)
  • Dangling DNS records vulnerable to hostile subdomain takeover
  • Expiring or misconfigured SSL/TLS certificates across all discovered hosts
  • Unauthorised cloud assets spun up outside central IT oversight

How It Works in 3 Steps

01

Continuous reconnaissance from the outside-in

HackGuardX correlates certificate transparency logs, passive DNS, and Autonomous System (ASN) data.

02

Fingerprint every live service & port

Detect when a new port opens or a staging environment becomes publicly reachable.

03

Get instant drift alerts

Receive Slack, Microsoft Teams, or email alerts whenever your public attack surface changes.

Read our Responsible Testing & Authorisation Policy
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Safe Passive DNS, TLS & Header Inspection
Non-intrusive public check • Active scanning requires verified ownership
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