Attack Surface Scanner — Know Your External Attack Surface Before Attackers Do
ShadowSurface is a cloud-based attack surface management platform that automatically discovers subdomains, scans open ports, maps CVE vulnerabilities, and detects cloud misconfigurations. Run your first free external attack surface scan in seconds.
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Trusted by security teams worldwide
What Is Attack Surface Management?
Attack Surface Management (ASM) is the continuous process of discovering, analyzing, and securing all externally facing digital assets that could be exploited by threat actors. Your external attack surface includes everything an attacker can see from the internet — subdomains, IP addresses, open ports, web applications, cloud storage buckets, SSL certificates, and third-party integrations.
Traditional vulnerability scanning focuses on known systems. In contrast, an external attack surface scanner like ShadowSurface starts with zero knowledge and discovers assets you may not even know exist — shadow IT, forgotten subdomains, development environments left exposed, or cloud resources misconfigured by other teams.
ShadowSurface combines four core discovery engines: subdomain enumeration to find every hostname under your domain, port scanning to detect open services, CVE mapping to match discovered software versions against known vulnerabilities, and cloud misconfiguration scanning to identify publicly exposed storage and databases.
How ShadowSurface Works
Complete external attack surface intelligence in three simple steps.
Discover Subdomains
Enter your domain. Our subdomain scanner queries certificate transparency logs and actively brute-forces DNS to find every hostname — including forgotten dev and staging environments.
Scan Ports & Services
For each discovered asset, our port scanner checks 100+ ports, grabs service banners, fingerprints technologies, and detects WAF/CDN protection layers.
Map CVEs & Cloud Risks
Discovered software versions are matched against our CVE database. Cloud resources are checked for public permissions and misconfigurations. You get a risk-scored report.
Average Risk Score: 73/100
Based on 10,000+ scans in the last 30 days.
Attack Surface Intelligence Features
Everything you need to discover, monitor, and secure your external digital footprint.
Subdomain Scanner
Enumerate thousands of subdomains via passive CT log queries and active DNS brute-forcing with a 5,000+ wordlist.
Port Scanner
Scan 100+ ports per asset with TCP connect scanning, banner grabbing, and service fingerprinting.
CVE Scanner
Match discovered Apache, Nginx, OpenSSH, IIS, and Python versions against known CVEs with confidence scoring.
Cloud Security Scanner
Detect publicly exposed S3 buckets, GCS blobs, Azure containers, and Firebase databases with misconfiguration details.
SSL Certificate Analysis
Monitor certificate expiry, detect self-signed certificates, weak ciphers, and chain validation errors.
WAF & CDN Detection
Identify Cloudflare, Akamai, AWS CloudFront, Sucuri, and generic WAF protection layers.
Executive Risk Reports
Generate PDF-ready risk-scored reports with severity distribution, asset tables, and remediation recommendations.
API & Bulk Scanning
Full REST API with API keys. Bulk scan up to 50 domains simultaneously on Enterprise plans.
Who Uses ShadowSurface?
Security Teams
SOC and red teams use ShadowSurface to continuously monitor their organization's external attack surface, discover shadow IT, and prioritize remediation based on real risk scores rather than vulnerability counts alone.
DevOps & Cloud Engineers
Cloud engineers scan for publicly exposed storage buckets, misconfigured load balancers, and forgotten development environments before attackers find them. Integrate scans into CI/CD pipelines via our REST API.
Penetration Testers
Pentesters run ShadowSurface during reconnaissance to quickly map the target's attack surface, identify high-value entry points, and generate professional reports for client deliverables.
Compliance Officers
Meet regulatory requirements for continuous asset discovery and vulnerability management. Generate audit-ready reports showing your organization's security posture over time.
Frequently Asked Questions
Everything you need to know about attack surface scanning with ShadowSurface.
Frequently Asked Questions
What is ShadowSurface?
ShadowSurface is a Cloud Attack Surface Intelligence (EASM) platform that discovers subdomains, open ports, CVEs, cloud misconfigurations, and SSL issues across your external infrastructure.
How does the demo scan work?
You can run a free demo scan on any domain without signing up. It performs subdomain enumeration, port scanning, and basic header analysis with results shown instantly.
What scan types are available?
Subdomain Only, Port Scan, CVE Check, Cloud Scan (S3/GCS/Azure), Full Scan, and Bulk Scan (Enterprise). Each plan unlocks different scan capabilities.
Is payment only via crypto?
Currently we accept USDT (TRC20) payments with automatic verification via TronScan API. Payment is processed instantly after blockchain confirmation.
Can I cancel my subscription?
Since we use crypto payments, there are no recurring subscriptions. Each payment is a one-time monthly upgrade that you can renew or let expire.
Is scanning intrusive or exploitative?
No. ShadowSurface only performs reconnaissance-level scanning: DNS enumeration, TCP connect scans, HTTP header analysis, and public cloud bucket checks. We never exploit vulnerabilities.
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Discover subdomains, open ports, CVEs, and cloud misconfigurations in minutes. No credit card required.