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Assetnote ASM is a commercial external attack surface management tool by Assetnote. Zerofox External Attack Surface Management is a commercial external attack surface management tool by ZeroFox. Compare features, ratings, integrations, and community reviews side by side to find the best external attack surface management fit for your security stack.
Based on our analysis of NIST CSF 2.0 coverage, core features, company size fit, deployment model, here is our conclusion:
Mid-market and enterprise security teams managing sprawling external infrastructure will get the most from Assetnote ASM because its hourly asset discovery actually catches exposures before your business units spin up new services, not weeks after. The platform covers ID.AM and DE.CM across NIST CSF 2.0, meaning you're building a real asset inventory while monitoring it continuously, and the exploit-based verification eliminates the noise that buries actionable findings in traditional scanners. Skip this if your organization lacks the headcount to operationalize a workflow-driven program; Assetnote's strength is enabling lean teams to prioritize, not giving you a dashboard to ignore.
Zerofox External Attack Surface Management
Mid-market and enterprise security teams drowning in shadow IT and unmanaged internet-facing assets will get the most from Zerofox External Attack Surface Management; its continuous discovery engine paired with attacker-perspective scanning surfaces exposures that static asset inventories consistently miss. The tool maps NIST ID.AM and ID.RA functions simultaneously, turning raw asset data into risk-ranked remediation queues rather than leaving you with a list of vulnerabilities to triage manually. Skip this if your organization has fewer than 50 internet-facing properties or if you need post-breach forensics; Zerofox is built for discovery and prioritization, not incident response.
External attack surface management platform with continuous asset discovery
Discovers and manages internet-facing assets with vulnerability prioritization
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Common questions about comparing Assetnote ASM vs Zerofox External Attack Surface Management for your external attack surface management needs.
Assetnote ASM: External attack surface management platform with continuous asset discovery. built by Assetnote. headquartered in Australia. Core capabilities include Hourly automated asset discovery and scanning, Asset enrichment and contextualization, Exploit-based vulnerability verification..
Zerofox External Attack Surface Management: Discovers and manages internet-facing assets with vulnerability prioritization. built by ZeroFox. headquartered in United States. Core capabilities include Continuous discovery of internet-facing assets including domains, IPs, and cloud services, Visual mapping of asset relationships and exposure chains, Real-time scanning using attacker-like techniques..
Both serve the External Attack Surface Management market but differ in approach, feature depth, and target audience.
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