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Starting at $49/month
Best Microsoft Defender External Attack Surface Management Alternatives ranked by AI · updated Aug 2026
Microsoft Defender External Attack Surface Management maps an organization's internet-facing assets and highlights exposures for security teams. It is aimed at enterprises already using Microsoft security products and benefits from integration with the broader Defender ecosystem.
Developer: Microsoft
Price: Custom pricing
🎯 microsoft.com/en-us/security/business/security-101/what-is-external-attack-surface-management-easm
Top 6 Microsoft Defender External Attack Surface Management alternatives
SecurityScorecard is a cybersecurity rating and continuous risk monitoring platform.
Custom pricing based on company size and requirements.
OWASP Amass is an open-source network mapping and attack surface discovery tool. It helps security professionals perform network mapping of attack surfaces...
Know Your Attack Surface is an online attack-surface-management service that helps organizations discover and monitor internet-facing assets. It is aimed at security...
Pros
- Focuses on discovering externally exposed assets
- Useful for identifying unknown internet-facing infrastructure
- Designed around continuous attack-surface visibility
Cons
- Public pricing and feature limits are unclear
- Less established than major enterprise ASM platforms
- May provide less integrated remediation workflow than broader security suites
Reposify is an external attack surface management platform for security teams that discovers and monitors internet-facing digital assets. It focuses on identifying...
Pros
- Discovers internet-facing assets beyond manually maintained inventories
- Designed for continuous external exposure monitoring
- Helps identify shadow IT and unknown infrastructure
Cons
- Enterprise-focused pricing and procurement
- Less suitable for internal network vulnerability management
- Public product and pricing information is limited
Cortex Xpanse is an external attack surface management platform that continuously discovers internet-exposed assets and services. It is built for enterprise security...
Pros
- Broad automated discovery of exposed infrastructure and services
- Strong remediation workflows within the Palo Alto Networks ecosystem
- Enterprise-scale monitoring and risk prioritization
Cons
- Typically substantially more expensive than free or lightweight ASM tools
- Best suited to organizations already invested in Palo Alto Networks
- Can involve more platform complexity than Chariot
Custom pricing
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