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CyberFurl's EASM platform continuously discovers and monitors your entire external attack surface — domains, subdomains, IPs, exposed services, and shadow IT — before attackers find them first.
Your security team secures what it knows about. Attackers attack what you've forgotten.
The gap between these two perspectives — your documented asset inventory and your true digital footprint — is your external attack surface. It expands every time a developer spins up a new cloud resource, every time marketing registers a new domain, every time an acquisition brings inherited infrastructure into scope. And it grows silently, invisibly, without a ticket being filed or an alert being triggered.
CyberFurl's External Attack Surface Management (EASM) platform continuously discovers and monitors every asset an attacker can see — providing the outside-in visibility that eliminates the gap between what you think you have and what attackers actually find.
[!IMPORTANT] The average enterprise organization has 30% more external-facing assets than appear in its official IT asset inventory. Every unknown asset is an unmonitored risk.
External Attack Surface Management (EASM) is the continuous discipline of discovering, cataloguing, monitoring, and securing all internet-facing digital assets attributable to an organization — including assets the organization may not know it owns or operates.
Unlike traditional vulnerability management (which scans a predefined, manually-maintained list of known assets), EASM begins from an organization's identity — its primary domains, IP ranges, ASN registrations, and brand names — and uses automated reconnaissance techniques to recursively discover the complete external digital footprint:
EASM is not a periodic audit. It is a continuous, automated intelligence discipline that provides real-time visibility into the external perimeter as it changes.
The fundamental problem with legacy security approaches is that they are inside-out: they begin with what the organization declares it owns and check those declared assets. An attacker, by contrast, is outside-in: they begin from the organization's visible identity and discover everything associated with it, regardless of what the organization's inventory says.
This asymmetry means that the most dangerous assets — the ones attackers specifically hunt — are exactly the ones that never appear in vulnerability scan results:
The Shadow IT Gap: A developer registers companyname-api-dev.com for a weekend hackathon, points it to a DigitalOcean droplet, and forgets about it. The server receives no security updates. Six months later, an attacker finds it via CT log monitoring. Your vulnerability scanner never knew it existed.
The Acquisition Blindspot: Your company acquires a startup with 47 external-facing services, 12 active domains, and 3 cloud accounts. The acquisition closes. Integration takes months. During that window, the inherited infrastructure remains unmonitored — not in your scanner's scope, not on your asset register.
The Subdomain Lifecycle Problem: A CNAME record pointing to a Heroku application is never removed when the app is decommissioned. The Heroku dyno is deleted. The CNAME now points to an unclaimed resource — a dangling CNAME. Any attacker can register that Heroku app name and begin serving content from your trusted subdomain.
The Configuration Drift Problem: A security control that was correctly configured in January may have been inadvertently disabled in March by a CI/CD pipeline deployment, a cloud provider update, or a developer making a quick fix in the console. Without continuous monitoring, the regression is invisible.
Understanding how attackers operationalize external attack surface intelligence reveals why continuous monitoring is non-negotiable.
An attacker monitors CT logs for your organization's domain variants. They identify legacy.yourcompany.com with a CNAME to a deleted Heroku application. They register the Heroku app name in under 5 minutes. They now control content served from your trusted subdomain — and can use it to host phishing pages, steal session cookies, or bypass CORS policies.
An automated scanner identifies an internet-facing Jenkins instance at build.yourcompany.io — a domain registered by a developer three years ago, running an outdated version of Jenkins with a known remote code execution CVE. The instance has never been in your vulnerability scanner's scope. The attacker exploits the CVE, establishes persistence, and uses the build server to inject malicious code into your CI/CD pipeline.
A staging environment at staging.yourcompany.com is discovered via CT log analysis. It runs a development version of your main application with weaker authentication controls (no MFA, rate limiting disabled for developer convenience). Attackers use it to validate credential lists against your authentication API before targeting production accounts.
An attacker registers yourcompany-billing.com and yourcompanysupport.com — both registered the same week. They configure MX records, set up a WordPress phishing page mimicking your customer portal, and send targeted phishing emails to your customer base. Neither domain is in your monitoring scope. You discover the campaign only after customers report suspicious emails.
Unmanaged external attack surfaces expose organizations to a cascade of interconnected security risks:
Certificate-Based Risks: Expired SSL certificates on subdomains cause browser warnings that erode user trust. Unauthorized certificate issuance (detectable via Certificate Transparency monitoring) indicates potential domain compromise. Weak cipher suites and legacy TLS protocol support on external endpoints create cryptographic attack vectors.
DNS-Based Risks: Dangling CNAME records enable subdomain takeover. NS drift — the gradual divergence between registered and actual nameservers — can redirect entire domain zones to attacker-controlled infrastructure. Unmonitored zone changes signal potential registrar-level compromise.
Application-Level Risks: Exposed development environments, unauthenticated API endpoints, and misconfigured cloud storage expose sensitive data without requiring any exploitation of a vulnerability — the assets are simply open to the internet.
Email-Based Risks: Unenforced DMARC policies leave all domains in the attack surface vulnerable to exact-domain spoofing used in Business Email Compromise (BEC) campaigns. Shadow domains — secondary domains owned by the organization — are frequently left without any email authentication, making them ideal BEC launch platforms.
The business consequences of an unmanaged external attack surface are severe, measurable, and increasingly likely as the attack surface expands with every cloud deployment:
CyberFurl correlates external attack surface findings across 10 distinct security intelligence pillars, providing contextual risk understanding that no single-vector tool can match:
When a single finding triggers alerts across multiple pillars — for example, a newly discovered subdomain with an expired certificate, a missing security header, and a CVE-vulnerable application stack — CyberFurl's correlation engine surfaces it as a high-priority compound risk requiring immediate attention.
CyberFurl continuously evaluates your external posture against 35+ discrete security controls organized across the 10 intelligence pillars. These controls are checked continuously — not annually, not quarterly, but as frequently as daily for critical controls and in near-real-time for Certificate Transparency log events.
Representative controls include:
p=reject required)max-age adequacy, and includeSubDomains directiveunsafe-inline absenceEach control generates a finding with severity rating, technical context, and step-by-step remediation guidance.
CyberFurl's EASM operates as a continuous intelligence loop — not a point-in-time assessment:
1. Discovery — Seed your organization's primary domains, IP ranges, and brand names. CyberFurl's reconnaissance engine recursively discovers all associated external assets using CT logs, DNS enumeration, ASN mapping, WHOIS analysis, and passive DNS datasets.
2. Analysis — Every discovered asset is analyzed against all 35+ security controls simultaneously. Technology fingerprinting identifies application stacks for CVE matching. DNS record analysis identifies misconfigurations. HTTP response analysis surfaces security header gaps.
3. Risk Scoring — Each finding is scored using our context-aware risk model that weighs exploitability, internet exposure, asset criticality, and multi-pillar correlation. Scores determine alert priority and dashboard ranking.
4. Monitoring — All discovered assets enter continuous monitoring. New assets added to the attack surface (new certificates issued, new subdomains deployed) are detected immediately. Existing assets are re-evaluated daily or on change detection.
5. Alerting — Critical and High findings route instantly to your team via Slack, PagerDuty, email, or webhook. Alert context includes: asset affected, finding detail, risk score, affected controls, and a direct link to remediation guidance.
6. Remediation — For each finding, CyberFurl provides specific, actionable remediation steps. Where applicable, we generate configuration snippets (DNS record changes, Nginx header directives, Terraform code) that engineers can apply directly.
Agentless External Reconnaissance — All discovery performed from the internet, requiring zero infrastructure changes. CyberFurl sees your attack surface exactly as an attacker does.
Certificate Transparency Intelligence — Near-real-time monitoring of all CT logs for newly issued certificates matching your domain variants — the earliest possible signal of unauthorized certificate issuance or shadow infrastructure deployment.
Lookalike Domain Surveillance — Continuous monitoring of global domain registries for newly registered typographic and visual variants of your brand domains. Alerts before phishing infrastructure is deployed.
Subdomain Takeover Prevention — Automated detection of dangling CNAME records across all discovered subdomains. Every discovered subdomain is checked against a comprehensive database of vulnerable third-party hosting providers.
Technology Fingerprinting + CVE Correlation — CyberFurl fingerprints the technology stack (web server, CMS, JavaScript frameworks, API gateways) of every discovered web application and correlates detected versions against the National Vulnerability Database (NVD) CVE feed.
Multi-Asset Risk Correlation — CyberFurl's graph-based risk engine connects findings across assets. A compromised IP range, a domain showing DNS drift, and a breach credential matching a company email address are correlated into a unified threat context rather than isolated alerts.
| Threat | Detection Method | Time to Alert |
| ---------------------------------- | --------------------------------------------------------- | --------------------- |
| New lookalike domain registered | Domain registry monitoring + similarity scoring | < 24 hours |
| Subdomain takeover vulnerability | CNAME dangling detection + third-party reachability check | Daily |
| SSL certificate expiry | Certificate validity scan | 60/30/14/7 day alerts |
| Unauthorized certificate issued | CT log monitoring | Near real-time |
| TLS 1.0/1.1 enabled | Protocol enumeration scan | Daily |
| DMARC unenforced (p=none) | DNS TXT record analysis | Daily |
| Open RDP/SSH on non-standard port | Port scan on discovered IPs | Daily |
| Breach credentials discovered | Breach database correlation | Continuous |
| CVE match on discovered technology | Tech fingerprint + NVD correlation | Daily |
| DNS zone record modified | Authoritative zone diff monitoring | Daily |
CyberFurl does not just alert — we guide remediation. Every finding includes:
Immediate Actions — What to do right now to reduce exposure. For a dangling CNAME, this is removing the DNS record. For an expired certificate, this is emergency certificate renewal. For an exposed admin panel, this is IP allowlisting.
Configuration Fixes — Exact configuration changes with copy-paste directives. For a missing HSTS header, CyberFurl provides the exact Nginx, Apache, and Next.js code snippets. For a DMARC gap, we show the exact TXT record to publish.
Verification Steps — After remediation, CyberFurl rescans the affected control and confirms the finding is resolved. The finding moves from Open → Remediating → Resolved with a full audit trail.
Escalation Routing — For findings that require specific engineering team ownership, CyberFurl generates pre-populated Jira or Linear tickets with all technical context, severity justification, and remediation steps included.
vs. Point-in-Time Scanners: Traditional scanners give you a snapshot. CyberFurl gives you a continuously updated live map. A scanner run on Monday misses the critical CNAME dangling record that appeared on Tuesday.
vs. Manual Security Audits: Penetration testers and consultants cannot monitor 24/7. A pentest is a point-in-time assessment of your attack surface at one moment in time. CyberFurl operates continuously, detecting the changes that occur between engagement windows.
vs. Traditional Vulnerability Assessments: Vulnerability assessments operate on your declared inventory. CyberFurl discovers your undeclared inventory — the shadow IT, the forgotten subdomains, the acquired infrastructure — that defines the real attack surface attackers target.
vs. Compliance-First GRC Platforms: Compliance tools prove controls existed at the audit date. CyberFurl proves controls are operating correctly right now, today, and flags the moment they change.
Organizations are actively consolidating their fragmented EASM, passive DNS, and threat intelligence tools into the unified CyberFurl platform. See how we replace legacy providers:
Don't wait to find out what attackers already know about your infrastructure. Start your free external attack surface assessment today.
Discover your full external digital footprint — subdomains, exposed services, shadow IT, and security gaps — in minutes.
Scan Your Attack Surface FreeExternal Attack Surface Management (EASM) is the continuous process of discovering, inventorying, monitoring, and securing all internet-facing assets that belong to an organization — including assets the organization may not know it owns. EASM platforms use automated reconnaissance techniques (Certificate Transparency logs, DNS enumeration, ASN mapping, WHOIS analysis) to build a real-time map of an organization's external digital footprint.
Traditional vulnerability scanners operate on a predefined, manually-maintained asset list. They only scan what you tell them to scan. EASM starts from your organization's identity (domains, IP ranges, ASNs) and recursively discovers all associated assets — including shadow IT, forgotten infrastructure, and recently acquired subsidiaries — that your internal asset list has never captured.
CyberFurl discovers: root domains and subdomains, IP addresses and CIDR blocks, SSL certificates and their associated hostnames, open ports and exposed services, web applications and APIs, cloud storage instances, development and staging environments, and infrastructure associated with recent acquisitions or brand variants.
CyberFurl performs continuous monitoring — not point-in-time scans. Our platform checks critical controls daily and monitors Certificate Transparency logs in near-real-time. When a new asset appears (a new subdomain, a new certificate issued for your domain variants), CyberFurl surfaces it immediately.
Shadow IT refers to infrastructure, services, or applications deployed by employees or business units without the knowledge or approval of the IT or security team. Shadow IT expands the attack surface invisibly — these assets are unmonitored, often unpatched, and represent the exact type of overlooked entry point that sophisticated attackers actively hunt for.
Yes. CyberFurl continuously monitors global domain registration activity for newly registered domains that are typographically or visually similar to your brand domains. We alert your security team the moment a lookalike domain (e.g., yourcompany-support.com, yourcomp4ny.com) is registered — often before the attacker has deployed any infrastructure.
No. CyberFurl is a fully agentless, cloud-native platform. We perform all reconnaissance externally from the internet — exactly as an attacker would — requiring zero installation on your servers, zero changes to your network configuration, and zero impact on your production systems.
CyberFurl uses a context-aware risk scoring engine. Every finding is scored based on: exploitability (how easy is it for an attacker to exploit?), exposure (is it internet-facing?), asset criticality (is this a production system?), and correlation with other active findings (is this exposed service also running software with a known CVE?). Critical findings requiring immediate action are surfaced at the top of the dashboard.