The best attack surface management tools in 2026: Cortex Xpanse, Microsoft Defender EASM, Mandiant ASM, CyCognito, Zafran, Censys, and CrowdStrike Falcon Exposure Management compared.
Palo Alto Networks Cortex Xpanse is the strongest external attack surface product: it scans 4.3 billion IPv4 addresses and 500 billion ports a day to find assets you did not know you owned. Microsoft Defender EASM is the pick for Microsoft-centric organizations that want external discovery tied into Defender for Cloud and Security Exposure Management. Zafran is the choice when the problem is not finding exposures but deciding which ones matter; CyCognito is the choice when you want discovered assets actively tested.
Attack surface management answers a question most organizations cannot: what do we expose to the internet right now, including the cloud accounts, subdomains, and services nobody registered with IT. The products in this list discover those assets from the outside, the way an attacker would, then assess and prioritize what they find. A newer class, exposure management, takes the same idea inside and asks which of thousands of findings an attacker could actually reach.
The list includes internet-scale scanners, platform-native options from Microsoft and CrowdStrike, an internet intelligence platform with an MCP server for AI agents, an exposure management product built to replace legacy vulnerability management, and a platform that actively tests what it discovers.
Commercial products only, one product per company, paid placements labeled. None of the seven is a paid placement.
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Best for: Enterprises that need to find unknown and unmanaged internet-facing assets
Cortex Xpanse continuously scans the internet to discover and remediate unknown risks: more than 500 billion ports daily and 4.3 billion IPv4 addresses several times a day. That scale is why it finds the forgotten servers, shadow cloud accounts, and exposed services that inventories miss.
Three capabilities work together: active discovery to scan and index unknown risks, active learning with supervised machine learning to map the attack surface and prioritize, and automated remediation playbooks. It assesses exposure to zero-day vulnerabilities across the discovered estate, detects and eliminates shadow cloud, and evaluates the security posture of acquisition targets during M&A.
Xpanse fits mid-market and enterprise and is cloud-delivered. It is the benchmark for external attack surface management and the natural choice for Palo Alto Networks customers using Cortex. Our data lists no named integrations.
CrowdStrike Falcon Exposure Management
Best for: CrowdStrike customers who want exposure and vulnerability management in Falcon
CrowdStrike Falcon Exposure Management provides attack surface visibility and vulnerability management inside the Falcon platform. It gives security teams a view of the complete attack surface to identify vulnerabilities and misconfigurations, with AI-powered vulnerability management to prioritize and address risk.
The platform connection is the reason to choose it: exposure findings sit next to endpoint detections and identity signals, and the Falcon sensor already on the device supplies the internal view that external scanners cannot see.
Our database holds no feature or integration list for this product, so confirm discovery methods, external scanning scope, and prioritization logic in evaluation. It fits mid-market and enterprise and is cloud-delivered; it is built for existing Falcon customers rather than as a standalone purchase.
Microsoft Defender EASM
Best for: Microsoft-centric organizations that want external discovery inside Defender
Microsoft Defender External Attack Surface Management discovers and inventories internet-facing assets across cloud, SaaS, and IaaS, including the unmanaged resources and shadow IT that business units create. The inventory updates in real time across multi-cloud and hybrid environments.
It finds exposed weaknesses, vulnerabilities, and misconfigurations in unmanaged resources down to the code level through global network mapping, tracks OWASP Top 10 issues, and converts natural language questions into inventory queries. Copilot in Azure supplies AI-driven risk insights. It integrates with Defender for Cloud, Security Copilot, and Microsoft Security Exposure Management.
Defender EASM fits SMB through enterprise and is cloud-delivered. For organizations standardized on Microsoft security, it brings external discovery into the same exposure view as the internal estate, which is the integration most teams want.
Google Mandiant Attack Surface Management
Best for: Organizations that want discovery from an attacker's perspective with threat intelligence checks
Mandiant Attack Surface Management discovers and analyzes internet-facing assets across distributed and cloud environments starting from minimal seed information such as domains, networks, or SaaS accounts, and builds the picture the way an attacker would.
Monitoring is continuous with configurable frequency (daily, weekly, or on demand), it identifies the technologies and services running on each asset, and outcome-based discovery workflows focus on specific goals. Active asset checks apply Mandiant threat intelligence to confirm whether an exposure is exploitable. It integrates with cloud and DNS providers and supports role-based access control.
Mandiant ASM fits mid-market and enterprise and is cloud-delivered. Choose it when intelligence about who is exploiting what matters as much as the inventory, and when it can sit alongside Google SecOps.
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Compare drop-in replacements for popular Attack Surface tools, ranked by feature overlap, integrations, and customer fit.
Best for: Teams drowning in vulnerability findings who need to know which ones are reachable
Zafran is an exposure management platform positioned as a replacement for legacy vulnerability management such as Kenna Security. It continuously discovers vulnerabilities across hybrid cloud, including agentless scanning of Windows and Linux, and aggregates and normalizes findings from the tools you already have.
Prioritization is the product. Each vulnerability is assessed on runtime presence, internet exposure, active exploitation in the wild, business criticality, and whether an existing defense already mitigates it. Compensating control mapping says what is already blocking an exploit, AI-optimized remediation plans sequence the work, and tickets are created and assigned automatically. Proactive exposure hunting handles high-profile vulnerabilities when they drop. It integrates with ServiceNow, Jira, EDR platforms, cloud platforms, WAFs, and firewalls.
Zafran fits SMB through enterprise and is cloud-delivered. It is the product for teams whose scanner output exceeds their capacity to fix.
Censys AI-Driven Solutions
Best for: Threat hunters and AI-assisted teams who want an internet map, not just their own surface
Censys AI-Driven Solutions is an internet intelligence platform that scans and maps internet infrastructure with predictive AI scanning that learns deployment patterns. It continuously monitors IP addresses, hosts, services, and websites across the whole internet, not only assets tied to your organization.
The Internet Map provides that visibility, a natural language Query Assistant writes searches in multiple languages, and a Model Context Protocol server lets AI agents query the platform directly. Attack surface management and threat hunting sit on top, with API access for automation.
Censys fits SMB through enterprise and is cloud-delivered. It is the choice for teams that hunt threat infrastructure as well as inventory their own exposure, and for organizations building AI-assisted security workflows. Our data lists no named integrations.
CyCognito Platform
Best for: Organizations that want discovered assets tested, not just listed
CyCognito Platform is external attack surface management that discovers, tests, and helps remediate exposed assets. Discovery uses attacker-like reconnaissance to map the organization's business structure and find assets across subsidiaries and acquisitions, which is where unknown exposure usually hides.
The difference from pure discovery products is active testing. It runs dynamic application security testing against web applications across the whole external surface, using a multi-pass, multi-engine architecture, then contextualizes and classifies each asset. Exploit intelligence from threat feeds, attack path visualization, and risk-based prioritization turn the results into a ranked list. Scanning cadence is configurable from daily to monthly.
CyCognito fits mid-market and enterprise and is cloud-delivered. Choose it when the question after discovery is whether an exposure is exploitable right now. Our data lists no named integrations.
How to Choose the Right Tool
Attack surface products fail in two directions: they miss assets, or they find so many exposures that nothing gets fixed. Evaluate discovery coverage first and prioritization second, and check how findings reach the people who remediate.
Test discovery with seed data only. Give each vendor your domains and nothing else, then count the assets they find that your inventory does not have (Xpanse, Mandiant, Defender EASM, Censys).
Decide whether you are buying external discovery or exposure prioritization. If the scanner backlog is the problem, Zafran addresses it directly.
Start from your platform. Microsoft security estates get Defender EASM inside Exposure Management; CrowdStrike customers get Falcon Exposure Management; Cortex customers get Xpanse.
Ask whether discovered assets get tested. CyCognito runs DAST across the external surface; most others assess without actively testing.
Ask how exploitability is determined: internet scans, threat intelligence checks (Mandiant), runtime and compensating control analysis (Zafran).
Check remediation routing. Integrations with ServiceNow, Jira, and chat tools (Zafran) decide whether findings become tickets or spreadsheets.
Consider M&A and shadow cloud. Xpanse evaluates acquisition targets and eliminates shadow cloud; confirm equivalents elsewhere.
If AI agents are part of your workflow, look for an MCP server and natural language querying (Censys, Defender EASM).
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For finding what you do not know you expose, Cortex Xpanse sets the bar and Mandiant and Censys are strong alternatives with different angles: intelligence checks and an internet-wide map. CyCognito adds active testing to discovery. Microsoft and CrowdStrike customers should start with the exposure product inside their platform. If the real problem is a backlog nobody can prioritize, Zafran is built for that. Run the seed-data discovery test before anything else; it settles most evaluations.
Frequently Asked Questions
What is external attack surface management?
Continuous discovery and assessment of everything an organization exposes to the internet, found from the outside the way an attacker would: domains, IPs, cloud resources, services, and shadow IT. Cortex Xpanse, Defender EASM, Mandiant ASM, and Censys are EASM products.
How is exposure management different from vulnerability management?
Vulnerability management lists findings. Exposure management prioritizes them by whether an attacker can reach and exploit them, considering internet exposure, runtime presence, active exploitation, and existing defenses. Zafran and Falcon Exposure Management take this approach.
Do I need EASM if I have a vulnerability scanner?
Yes if you want to find the assets the scanner does not know about. Scanners assess what they are pointed at; EASM finds the servers and cloud accounts nobody pointed them at.
Which products scan the whole internet?
Cortex Xpanse scans 4.3 billion IPv4 addresses and 500 billion ports daily, and Censys maps internet infrastructure with predictive scanning. Others discover from seed data tied to your organization.
Can AI agents use these platforms?
Censys exposes a Model Context Protocol server for AI agents, and Defender EASM converts natural language to inventory queries with Copilot in Azure.
How is attack surface management priced?
Usually by number of monitored assets or organizations, with exposure management priced per asset or per user. None of the vendors in this list publish enterprise list prices.
How this list was made
Commercial products only, one product per company, companies that were acquired are excluded. Ranked by market signals and an editorial review. Paid placements are labeled. Read the full methodology at /methodology.
