What Is External Attack Surface Management (EASM)?
External Attack Surface Management (EASM) is a continuous security discipline that discovers, inventories, and monitors every internet-facing asset your organisation owns — known or unknown — and assesses them for vulnerabilities before attackers do. Unlike a point-in-time penetration test, EASM runs continuously, surfacing new exposures the moment they appear.
Your external attack surface includes every asset reachable from the public internet: domains and subdomains, IP ranges, cloud storage buckets, APIs, SaaS app integrations, open ports, SSL certificates, web applications, and even forgotten shadow-IT assets registered by employees without IT approval.
EASM vs Penetration Testing vs Vulnerability Assessment
| Feature | EASM | VAPT | Vulnerability Assessment |
|---|---|---|---|
| Frequency | Continuous (24/7) | Point-in-time (annual/quarterly) | Point-in-time (scheduled) |
| Scope | All external assets, including unknown | Defined scope, known assets | Defined scope, known assets |
| Asset discovery | Yes — finds shadow IT, expired subdomains, rogue cloud | No | No |
| Exploitation | No — identifies exposure, not exploitability | Yes — simulates attacker | No |
| Output | Continuous risk dashboard + alerts | Detailed report with proof of exploitation | Vulnerability list + severity ratings |
| Best for | Ongoing visibility + compliance posture | Deep security validation, compliance mandates | Scheduled hygiene checks |
EASM and VAPT are complementary: EASM tells you what is exposed continuously; VAPT tells you how exploitable it is in depth. Leading security programmes run both.
What MDIT Services Discovers in Your Attack Surface
- Subdomain enumeration — Active and passive discovery of all subdomains, including expired, parked, or dangling subdomains that attackers use for subdomain takeover attacks
- Open port and service mapping — TCP/UDP port scans across your IP ranges to identify exposed services (RDP, SSH, FTP, databases) that should not be internet-accessible
- SSL/TLS certificate analysis — Expired, self-signed, weak-cipher, or misconfigured certificates that enable MITM attacks or fail compliance audits
- Cloud asset discovery — Publicly accessible S3 buckets, Azure Blob containers, GCP storage with misconfigured ACLs leaking customer data or source code
- Web application fingerprinting — CMS versions, framework versions, admin panels, API endpoints, and login pages exposed without rate-limiting or MFA
- Leaked credentials and secrets — API keys, tokens, and credentials accidentally committed to public repositories (GitHub, GitLab, Bitbucket) or exposed in JavaScript files
- Third-party and supply chain exposure — Risks introduced by SaaS providers, embedded scripts, and third-party APIs integrated with your systems
- Brand and domain monitoring — Typosquatted domains, phishing sites impersonating your brand, and lookalike domains used for credential harvesting
MDIT’s EASM Methodology
Phase 1 — Asset Discovery
We begin with your seed assets — primary domains, IP ranges, ASNs, and organisation name — and use passive reconnaissance (certificate transparency logs, DNS records, WHOIS data, Shodan, threat intelligence feeds) combined with active enumeration to build a complete asset inventory. No agent installation required on your systems.
Phase 2 — Risk Scoring and Prioritisation
Each discovered asset is scored by exploitability, exposure severity, asset criticality, and business impact. We map findings to OWASP Top 10, CVE databases, and CIS Controls to give you a risk-prioritised remediation queue, not a flat list of thousands of issues.
Phase 3 — Continuous Monitoring and Alerting
EASM is not a one-time exercise. We configure continuous monitoring with alert thresholds — you receive immediate notification when a new subdomain appears, a port opens unexpectedly, a certificate expires in under 30 days, or a credential leak is detected in a public repository.
Phase 4 — Remediation Guidance and Validation
Each finding includes step-by-step remediation guidance written for your team’s technical level. After fixes are applied, we validate closure so you have an auditable record of risk reduction — useful for CERT-In compliance, ISO 27001 audits, and board-level security reporting.
Industries We Serve
EASM is especially critical for organisations in regulated sectors or those with large, distributed digital footprints:
- BFSI — Banks, NBFCs, payment companies subject to RBI cybersecurity guidelines and CERT-In 6-hour incident reporting requirements
- E-commerce and retail — High-value targets with payment integrations, customer PII, and seasonal infrastructure scaling that creates temporary exposures
- Healthcare — Hospital systems, health-tech platforms, and diagnostic companies holding sensitive patient data under DPDP Act obligations
- IT/ITeS and SaaS — Organisations with complex cloud infrastructure, multiple development environments, and frequent releases creating new exposure points
- Government and PSUs — Public-sector organisations mandated under CERT-In guidelines to maintain continuous vulnerability management
Compliance Alignment
EASM supports compliance with key Indian and international frameworks:
- CERT-In (2022 Directions) — Mandates continuous vulnerability scanning and patch management with 6-hour breach reporting; EASM provides the continuous monitoring layer
- RBI Cybersecurity Framework — Requires banks and payment system operators to maintain an inventory of IT assets and continuously monitor for vulnerabilities
- ISO 27001:2022 (Annex A 8.8) — Controls for management of technical vulnerabilities; EASM provides the automation layer for continuous compliance
- PCI DSS v4.0 (Requirement 11) — Internal and external vulnerability scans at least quarterly; EASM continuously satisfies the external scanning requirement
- DPDP Act 2023 — Data fiduciaries must implement appropriate technical safeguards; EASM identifies exposures that could lead to notifiable data breaches
Why Choose MDIT Services for EASM
MDIT Services is a Pune-based cybersecurity firm with hands-on experience in external attack surface operations for Indian enterprises. Our EASM practitioners hold certifications including CEH, OSCP, and eJPT. We combine automated tooling (Amass, Subfinder, Nuclei, Shodan, custom threat intel feeds) with manual analyst review to eliminate the false-positive noise that automated-only tools generate.
Our reports are written in plain language for both technical teams and management, with a separate executive summary suitable for board and audit committee presentation.
Frequently Asked Questions — EASM
What is the difference between EASM and ASM?
ASM (Attack Surface Management) is the broad category; EASM (External Attack Surface Management) specifically focuses on internet-facing assets — what attackers see from outside your network. IASM (Internal ASM) covers assets inside the network perimeter. EASM is typically the starting priority because external assets are directly reachable by any attacker worldwide without first needing network access.
How long does an EASM engagement take to set up?
An initial EASM engagement for a mid-sized organisation (1-5 primary domains, up to 10 IP ranges) typically takes 5-7 business days from kickoff to first report delivery. Ongoing continuous monitoring is set up in parallel and begins generating alerts within 48 hours of the initial asset discovery scan completing.
Does EASM require installing software on our servers?
No. External attack surface discovery is performed entirely from outside your network, the same way an attacker would approach your organisation. No agent, plugin, or software needs to be installed on your systems. This also means EASM captures exactly what an external threat actor can see — without any internal visibility advantage.
How is EASM priced?
MDIT’s EASM engagements are scoped based on the number of primary domains, IP ranges, and monitoring frequency. One-time assessments start from ₹40,000 for small organisations; continuous monitoring programmes (quarterly reassessments + real-time alerting) are available from ₹15,000/month. Contact us for a tailored quote based on your asset inventory.
Market Your EASM Services
External attack surface management is an emerging category — buyers are actively searching for information and vendors online. MDIT’s digital marketing services help EASM providers rank for the queries their buyers use and convert that traffic into qualified sales conversations.
- SEO Services — Rank for “external attack surface management india”, “EASM tools”, “attack surface monitoring” and related high-intent queries
- Content Marketing — Technical guides, comparison pages, and use-case content that positions your firm as the EASM authority
- B2B Lead Generation — Reach CISOs and security architects at enterprise organisations before competitors do
