Defender External Attack Surface Management

Name: Defender External Attack Surface Management
Brand: Microsoft
Rating: 4.3 (174 reviews)

Defender External Attack Surface Management is an outside-in discovery and monitoring service that identifies and inventories internet-exposed assets (including unknown and unmanaged resources) and provides continuous external visibility to feed security posture management and investigation workflows across the Microsoft Defender ecosystem.

Est 1975|Valuation $2888.5B|Raised $72.9B

LinkedIn 29.0M|Website|Web traffic 1233.4M|FTEs 232,851|HQ Redmond, Washington, US

MarketsVulnerability Management Cloud-Native Application Protection Platform (CNAPP)Web Application & API Protection (WAAP)Security Service Edge (SSE)Security Information and Event Management (SIEM)Endpoint Management (UEM)

Defender External Attack Surface Management screenshot

01Competitive Landscape

| Aspect | Defender EASM | Palo Alto Cortex Xpanse | CrowdStrike Falcon Surface | |--------|---------------|--------------------------|----------------------------| | Starting Price | Pay-as-you-go; published per-asset pricing is not shown on vendor public pricing pages | Subscription-based; pricing typically depends on asset volume, scope, and features (published list pricing often not shown) | Published list pricing for the Falcon Surface module is not typically shown; enterprise purchasing generally requires vendor quotes | | Best For | Microsoft-centric security stacks seeking integrated external asset discovery and posture workflows | Organizations wanting a dedicated EASM platform with operational workflows integrated into the Cortex ecosystem | Teams that use the CrowdStrike platform and want outside-in visibility integrated with Falcon modules | | Key Strength | Integration with Defender and Sentinel, which can simplify consolidation for Microsoft-centric environments | Positions itself with an Internet Operations Management framing and focused EASM workflows | Part of a broader endpoint-to-exposure platform; value increases when used within an existing CrowdStrike deployment | | Key Weakness | Reported pricing opacity and noisy findings for some users; potential workflow friction when exporting and operationalizing data | Pricing complexity and scope-driven costs may be inefficient if only basic discovery is required | Published pricing for EASM modules may be opaque; costs can be substantial when bundled with other modules | - Direct competitors and their key differentiators - Cortex Xpanse: Positions around internet operations and discovery plus operational workflow features. - CrowdStrike Falcon Surface: Provides outside-in visibility as part of the Falcon platform; integration benefits accrue to organizations that already use CrowdStrike. - Tenable Attack Surface Management: Often paired with vulnerability and exposure management in Tenable's broader portfolio, appealing where scanning and exposure prioritization are preferred from a single vendor. - Pricing comparison: value proposition vs alternatives - Transparent list pricing is uncommon across the EASM category; many vendors price by asset counts, modules, and scope. - Defender EASM’s pay-as-you-go framing may suit elastic usage patterns, but the absence of clear up-front pricing on public pages can be a procurement friction point. - Customer testimonials comparing this product to competitors - Comparative review pages are available on online review platforms; comparisons should be evaluated with attention to the specific use case and scope differences between EASM and broader vulnerability/exposure products. - Market share and adoption trends - Public sources reviewed do not provide reliable market-share numbers for Defender EASM. - Analyst and review platforms indicate that Defender EASM is evaluated alongside other vendors such as Falcon Surface and Cortex Xpanse, suggesting active consideration in the market. - When customers choose competitors instead (and why) - Choose Cortex Xpanse when a dedicated EASM-first platform and operational workflows independent of Microsoft portals are required. - Choose Falcon Surface when endpoint/XDR standardization is already on CrowdStrike and customers prefer fewer vendors. - Choose Tenable when prioritizing convergence with vulnerability and exposure management and wanting ASM as part of an integrated exposure-management portfolio.

01Competitive Landscape

Aspect	Defender EASM	Palo Alto Cortex Xpanse	CrowdStrike Falcon Surface
Starting Price	Pay-as-you-go; published per-asset pricing is not shown on vendor public pricing pages	Subscription-based; pricing typically depends on asset volume, scope, and features (published list pricing often not shown)	Published list pricing for the Falcon Surface module is not typically shown; enterprise purchasing generally requires vendor quotes
Best For	Microsoft-centric security stacks seeking integrated external asset discovery and posture workflows	Organizations wanting a dedicated EASM platform with operational workflows integrated into the Cortex ecosystem	Teams that use the CrowdStrike platform and want outside-in visibility integrated with Falcon modules
Key Strength	Integration with Defender and Sentinel, which can simplify consolidation for Microsoft-centric environments	Positions itself with an Internet Operations Management framing and focused EASM workflows	Part of a broader endpoint-to-exposure platform; value increases when used within an existing CrowdStrike deployment
Key Weakness	Reported pricing opacity and noisy findings for some users; potential workflow friction when exporting and operationalizing data	Pricing complexity and scope-driven costs may be inefficient if only basic discovery is required	Published pricing for EASM modules may be opaque; costs can be substantial when bundled with other modules

Direct competitors and their key differentiators
- Cortex Xpanse: Positions around internet operations and discovery plus operational workflow features.
- CrowdStrike Falcon Surface: Provides outside-in visibility as part of the Falcon platform; integration benefits accrue to organizations that already use CrowdStrike.
- Tenable Attack Surface Management: Often paired with vulnerability and exposure management in Tenable's broader portfolio, appealing where scanning and exposure prioritization are preferred from a single vendor.
Pricing comparison: value proposition vs alternatives
- Transparent list pricing is uncommon across the EASM category; many vendors price by asset counts, modules, and scope.
- Defender EASM’s pay-as-you-go framing may suit elastic usage patterns, but the absence of clear up-front pricing on public pages can be a procurement friction point.
Customer testimonials comparing this product to competitors
- Comparative review pages are available on online review platforms; comparisons should be evaluated with attention to the specific use case and scope differences between EASM and broader vulnerability/exposure products.
Market share and adoption trends
- Public sources reviewed do not provide reliable market-share numbers for Defender EASM.
- Analyst and review platforms indicate that Defender EASM is evaluated alongside other vendors such as Falcon Surface and Cortex Xpanse, suggesting active consideration in the market.
When customers choose competitors instead (and why)
- Choose Cortex Xpanse when a dedicated EASM-first platform and operational workflows independent of Microsoft portals are required.
- Choose Falcon Surface when endpoint/XDR standardization is already on CrowdStrike and customers prefer fewer vendors.
- Choose Tenable when prioritizing convergence with vulnerability and exposure management and wanting ASM as part of an integrated exposure-management portfolio.

Aspect

Defender EASM

Palo Alto Cortex Xpanse

CrowdStrike Falcon Surface

Starting Price

Pay-as-you-go; published per-asset pricing is not shown on vendor public pricing pages

Subscription-based; pricing typically depends on asset volume, scope, and features (published list pricing often not shown)

Published list pricing for the Falcon Surface module is not typically shown; enterprise purchasing generally requires vendor quotes

Best For

Microsoft-centric security stacks seeking integrated external asset discovery and posture workflows

Organizations wanting a dedicated EASM platform with operational workflows integrated into the Cortex ecosystem

Teams that use the CrowdStrike platform and want outside-in visibility integrated with Falcon modules

Key Strength

Integration with Defender and Sentinel, which can simplify consolidation for Microsoft-centric environments

Positions itself with an Internet Operations Management framing and focused EASM workflows

Part of a broader endpoint-to-exposure platform; value increases when used within an existing CrowdStrike deployment

Key Weakness

Reported pricing opacity and noisy findings for some users; potential workflow friction when exporting and operationalizing data

Pricing complexity and scope-driven costs may be inefficient if only basic discovery is required

Published pricing for EASM modules may be opaque; costs can be substantial when bundled with other modules