External Attack Surface Management (EASM)
External Attack Surface Management platforms continuously map and monitor your organisation’s internet-facing footprint from an attacker’s point of view. Instead of relying on internal CMDBs and manually maintained asset lists, EASM tools discover domains, subdomains, IP ranges, services, certificates, and common SaaS usage to reveal unknown or unmanaged assets—common initial breach points. Traditional vulnerability scanning assumes you already know what to scan and where it lives. EASM starts earlier. It focuses on discovery and attribution: finding assets that appear to belong to your organisation and tying them back to owners, environments, and business units. Modern platforms then layer exposure analysis, risk scoring, and alerting on top so security teams can drive remediation by the teams that actually control those assets. For leadership, EASM provides a way to talk about external risk in concrete terms: how many internet-facing assets you have, which ones are most exposed, and how that picture is changing over time.
Vendor shortlist
11 listed- VisitAssetnote
The Assetnote Continuous Security Platform continuously maps internet‑facing assets using advanced, largely agentless reconnaissance techniques, keeping an always‑current asset inventory. It performs high‑signal security analysis and real‑time exposure monitoring—often scanning hourly—to detect real, exploitable exposures while filtering out false positives, and integrates attack‑surface and exposure data into SIEMs and MSSP workflows. (assetnote.io)
Pricing: undisclosedContinuous external asset discovery and inventoryagentless passive and active discovery enginesnear real‑time exposure monitoring (hourly scans)high‑signal vulnerability detection and proprietary researchattack surface reduction and shadow‑IT visibility+1 moreView details → - Visit
AttaxionAttaxion runs as an agentless SaaS platform that discovers and inventories internet‑facing assets across domains, IPs, and services, including unknown and shadow IT. It continuously monitors those assets, surfaces vulnerabilities and misconfigurations, and presents a real‑time inventory with contextual information so security teams can quickly see what has changed and where the most critical exposures are. (Attaxion)
Pricing: undisclosedHigh‑coverage external asset discoverycontinuous monitoring of internet‑facing assetsshadow‑IT identificationreal‑time asset inventory and technology fingerprintingvulnerability and misconfiguration detection+1 moreView details → - Visit
CaveloThe Cavelo Attack Surface Management platform continuously discovers and classifies sensitive data (PII and proprietary data), scans digital entry points such as web apps, APIs, cloud infrastructure, and endpoints, and correlates this with vulnerability and configuration data. It brings CVSS and EPSS scores into the context of the environment and data, providing risk‑based insights for remediation and reporting. (Cavelo)
Pricing: undisclosedContinuous data discovery and classificationscanning of web apps, APIs, cloud infrastructure, and endpointsintegrated vulnerability management with CVSS/EPSS contextattack‑surface and data‑risk dashboardsMSP/MSSP‑friendly multi‑tenant operation+1 moreView details → - Visit
CyCognitoThe CyCognito platform uses global reconnaissance infrastructure and graph data modeling to automatically discover external assets, build a contextual inventory, assess their risk, and prioritize remediation. The Attack Surface Management component provides deep visibility into attacker‑exposed assets and ties findings into remediation tools, reducing validation time from months to hours. (CyCognito)
Pricing: undisclosedSmart, continuous attack surface discoverygraph‑based asset inventory and ownership mappingrisk assessment and business‑context scoringprioritization of exploitable vulnerabilitiesremediation guidance and integrations with ITSM/DevOps tools+1 moreView details → - Visit
FortifyDataFortifyData’s ASM solution automatically discovers assets such as domains, IPs, cloud instances, APIs, networks, and third‑party footprints, then assesses all ports and services to identify vulnerabilities an attacker would find. It correlates asset and vulnerability data with threat intelligence and security ratings to provide a risk‑based view and feeds this into assessments and GRC processes. (FortifyData)
Pricing: undisclosedDiscovery of external, internal, cloud, and third‑party assetscontinuous monitoring of internet‑facing assetsautomated assessment of ports and servicesintegrated threat intelligence and security‑ratings datarisk‑based prioritization+1 moreView details → - Visit
HadrianHadrian’s platform continuously maps external assets and then performs Continuous Automated Red Teaming: AI‑driven simulations that probe assets for realistic attack paths. It combines attack surface discovery, automated penetration testing, and threat exposure management into a single workflow, validating which issues are actually exploitable and prioritizing remediation based on business and technical risk. (Hadrian)
Pricing: undisclosedExternal asset discovery and mappingcontinuous attack surface managementautomated/agentic penetration testingAI‑driven threat exposure managementrisk discovery and prioritization+1 moreView details → - Visit
Halo securityHalo’s External Attack Surface Management platform automatically discovers internet‑facing assets (domains, IPs, services), builds an inventory, and continuously scans them using agentless techniques. It aggregates vulnerabilities and misconfigurations into a single view, supports organizing assets by business unit/organization, and provides dashboards, alerts, and reports so teams can track remediation and reduce exposure over time.
Pricing: undisclosedContinuous external asset discoveryagentless external scanningrisk analysis and scoringvisual inventory of internet‑facing assetsMSP‑friendly multi‑organization views+1 moreView details → - Visit
IONIXIONIX’s EASM platform runs a continuous discovery engine that identifies internet‑facing assets and their relationships, extending out into third‑party and supply‑chain environments. It maps the attack surface, validates exploitable issues, and enriches them with context, then feeds prioritized findings into workflows so security teams can remediate the riskiest exposures first. (IONIX)
Pricing: undisclosedContinuous external and third‑party asset discoveryattack surface mapping and visualizationdeep digital supply‑chain visibilityvalidation of exploits to reduce false positivesrisk‑based prioritization and streamlined remediation+1 moreView details → - Visit
RiskProfilerRiskProfiler builds an “Internet Inventory” of an organization’s external‑facing digital assets across on‑prem, cloud, and mobile, using both ASM and a dedicated Cloud External ASM module. It uncovers shadow IT, vulnerabilities, misconfigurations, and risky connections, leveraging vulnerability intelligence and real‑time alerts so teams can continually monitor and remediate exposures across their digital perimeter and cloud environments. (RiskProfiler)
Pricing: undisclosedAutomated inventory of internet‑exposed assetscloud‑focused External ASM module with connectorsdiscovery of shadow IT and risky connectionsdetection of vulnerabilities and misconfigurationsreal‑time alerts and dashboards+1 moreView details → - VisitTRaViS
TRaViS continuously discovers and monitors digital assets such as websites, APIs, and exposed credentials. It applies AI‑driven analysis and threat intelligence to identify critical risks, track shadow assets, and correlate findings with dark‑web and breach data. The platform provides continuous monitoring, intelligent vulnerability prioritization, and workflow integrations so organizations and MSSPs can manage external risk from a single dashboard. (travisasm.com)
Pricing: undisclosedAutomated discovery of external assets and shadow ITcontinuous monitoring and threat analysisdark‑web and breach intelligenceAI‑driven vulnerability prioritizationdashboards tailored to CISOs, SOCs, and MSSPs+1 moreView details → - Visit
watchTowrThe platform’s Adversary Sight engine reconstructs an organization’s external footprint from an attacker’s perspective, using real‑world reconnaissance to continuously discover known and unknown assets across SaaS, cloud, applications, and infrastructure. On top of this EASM layer, watchTowr runs preemptive exposure management, rapidly testing assets against emerging threats and vulnerabilities and surfacing those that are actively exploitable, often within hours of disclosure. (watchTowr)
Pricing: undisclosedAdversary‑style external attack surface mappingcontinuous discovery of unknown assets (SaaS, cloud, infra, subsidiaries, shadow IT)integration of EASM with proactive threat intelligencerapid testing against emerging threatsprioritized exploitable vulnerabilities+1 moreView details →
What we evaluate
- Coverage & depth of the core use case
- Deployment model, integrations, and time to value
- Detection quality and false-positive posture
- Ecosystem: SIEM, SOAR, and identity plumbing
- Pricing transparency and total cost of ownership
- Vendor traction, roadmap, and support experience