External Attack Surface Management (EASM)
Your organization's external attack surface is larger than you think. DriftAlarm provides external attack surface management that continuously discovers internet-facing assets, identifies vulnerabilities, and detects changes across your entire digital footprint. Know what attackers see before they exploit it.
What Is External Attack Surface Management?
External Attack Surface Management (EASM) is the continuous process of discovering, inventorying, classifying, and monitoring all internet-facing assets and exposures belonging to an organization. Unlike internal vulnerability management that scans known assets behind the firewall, EASM operates from the outside in, mimicking an attacker's perspective to find everything that is visible from the public internet. This includes domains, subdomains, IP addresses, open ports, web applications, APIs, cloud storage, email servers, VPN gateways, and any other infrastructure accessible from the internet.
The EASM category emerged because organizations lost visibility into their own external footprint. Cloud adoption accelerated infrastructure provisioning to the point where security teams cannot keep pace manually. A developer can provision a cloud server with a public IP in minutes. A marketing team can launch a campaign microsite on a new subdomain without informing IT. A third-party vendor can deploy an integration endpoint that exposes internal data. Each of these actions expands the attack surface without updating any central inventory.
EASM platforms solve this visibility gap through automated, continuous discovery and monitoring. Rather than relying on manual asset inventories that become outdated the moment they are compiled, EASM continuously scans and maps the external footprint, comparing current state against known baselines to detect changes. This approach catches shadow IT, forgotten infrastructure, misconfigurations, and newly introduced vulnerabilities before they are discovered and exploited by threat actors.
How DriftAlarm Delivers EASM
Start by providing your root domains and IP ranges. DriftAlarm immediately begins automated discovery, expanding from these seed assets to map your complete external footprint. There is nothing to install, no agents to deploy, and no network changes required. The entire platform operates externally, scanning your assets the same way an attacker would.
DriftAlarm uses Amass for recursive subdomain enumeration, combining passive reconnaissance (certificate transparency logs, DNS datasets, web archives) with active DNS resolution to discover every subdomain associated with your domains. Each discovered hostname is resolved to its IP addresses, and each IP is probed for running services using httpx and comprehensive port scanning. The result is a complete map of your external attack surface.
Every discovered asset is assessed for vulnerabilities using Nuclei with thousands of detection templates. The scan covers known CVEs, web application misconfigurations, exposed administrative panels, default credentials, sensitive file exposure, SSL/TLS certificate issues, missing security headers, and information disclosure. Findings are prioritized by severity: critical, high, medium, and informational.
DriftAlarm identifies the technology stack running on each asset, including web server software, application frameworks, CMS platforms, JavaScript libraries, CDN providers, and hosting infrastructure. This technology inventory helps you identify outdated software versions, end-of-life components, and technology sprawl across your external footprint.
After establishing a baseline, DriftAlarm monitors for changes using 32 built-in detection rules organized into 7 rule packs. The platform detects new assets, new open ports, service changes, technology changes, certificate expirations, DNS modifications, removed security headers, and dozens of other change types. Each change is a drift event that is evaluated, classified, and delivered to you via Slack or email notifications.
Every vulnerability and drift event includes remediation guidance generated by Claude AI. Instead of a raw CVE description and a CVSS score, you get specific, actionable steps to resolve each issue. The AI considers the detected technology, the specific misconfiguration, and the context of the finding to provide tailored remediation instructions that your team can act on immediately.
EASM Capabilities
Continuous Asset Discovery
Weekly discovery scans enumerate subdomains, resolve IP addresses, and identify new assets that have been added to your external footprint. Passive and active reconnaissance techniques ensure comprehensive coverage, discovering assets that manual inventories and traditional scanners miss.
Daily Vulnerability Scanning
Nuclei-based vulnerability scans run daily against all discovered assets, checking for newly disclosed CVEs, web application vulnerabilities, misconfigurations, and exposed sensitive data. New vulnerability templates are added continuously as new threats emerge, keeping your assessment current.
Drift Detection and Change Monitoring
The drift detection engine is what sets DriftAlarm apart from basic vulnerability scanners. With 32 built-in rules across 7 rule packs, plus the ability to create custom rules, you maintain continuous awareness of how your attack surface is changing. New subdomain? New open port? Certificate expiring? Security header removed? DriftAlarm detects it and alerts you.
Domain Intelligence via RDAP
RDAP-based domain lookups provide registration details, registrar information, expiration dates, nameserver configuration, and DNSSEC status. Monitor domain expirations to prevent lapses that could enable domain hijacking or subdomain takeover attacks.
Technology Stack Inventory
Comprehensive technology fingerprinting catalogs every technology detected across your assets: web servers, application frameworks, CMS platforms, JavaScript libraries, analytics tools, CDN providers, and more. Track technology changes over time and identify outdated or end-of-life components that increase your risk.
AI Remediation and Risk Context
Claude AI analyzes each finding and generates specific remediation guidance. Beyond telling you what is wrong, the AI explains why it matters, what the real-world risk is, and provides step-by-step instructions to fix it. This transforms raw vulnerability data into actionable intelligence that your team can use immediately.
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DriftAlarm vs. Enterprise EASM Platforms
| Capability | DriftAlarm | Enterprise EASM |
|---|---|---|
| Time to First Results | Under 90 seconds | Days to weeks of onboarding |
| Setup Requirements | Zero — no agents, no integrations | API integrations, data feeds, professional services |
| Asset Discovery | Amass + DNS + certificate transparency | Proprietary scanners + data partnerships |
| Vulnerability Scanning | Nuclei with thousands of templates | Varies by vendor |
| Drift Detection | 32 rules, 7 packs, custom rules | Limited or add-on module |
| AI Remediation | Built-in Claude AI guidance | Usually not included |
| Pricing Model | Transparent monthly pricing | $50,000-$250,000+ per year |
| Trial | 30 days free, no credit card | Custom demo and POC process |
Who Uses EASM
Security Leaders Building Visibility Programs
CISOs and security directors implementing attack surface management programs need a platform that provides immediate visibility without months of deployment and integration work. DriftAlarm delivers first results in under 90 seconds, with continuous monitoring operational from day one. This makes it possible to demonstrate value immediately and build the case for broader security investment based on concrete data about your actual external exposure.
Lean Security Teams at Mid-Market Companies
Organizations with one to five security professionals cannot justify the cost or complexity of enterprise EASM platforms that require dedicated staff to operate. DriftAlarm provides enterprise-grade external attack surface management with zero operational overhead. Automated discovery, scanning, drift detection, and AI remediation mean your team spends time fixing issues, not managing tools.
Managed Security Service Providers
MSSPs need scalable, multi-tenant external monitoring that covers all client environments. DriftAlarm's asset-based architecture lets service providers monitor domains and IP ranges across their entire client portfolio with automated discovery, vulnerability scanning, and drift detection. Drift alerts and remediation guidance flow directly to the service provider's operational workflow via Slack and email integration.
Compliance and Risk Management Teams
Organizations working toward or maintaining compliance with frameworks like PCI DSS, SOC 2, ISO 27001, or NIST CSF need continuous external vulnerability management. DriftAlarm provides the automated, ongoing asset discovery and vulnerability assessment that these frameworks require, with detailed scan results and drift event history that serve as evidence of continuous monitoring.
Frequently Asked Questions
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