External Attack Surface Management.
If you don't know what you have — or what's exposed and shouldn't be — how can you protect it? Discover all your assets, add them to the dashboard of your digital infrastructure, and prioritize remediation steps with BlackstoneOne's Vulnerability Management.
Trusted by:
External Attack Surface Management — EASM
See everything an attacker could see, before they see it.
What is External Attack Surface Management?
EASM is the process of continuously discovering, monitoring, evaluating, prioritizing and remediating possible entry points within your organisation's IT infrastructure that could be susceptible to an attack. As organisations grow, their digital estate becomes larger and more complex, spanning multiple websites, infrastructures and applications, leaving a significant portion of assets unidentified and vulnerable.
How does BlackstoneOne help?
BlackstoneOne's EASM gives you insight into all of your digital assets, including shadow IT, devices, web pages, and servers, reducing the risk of being attacked by cybercriminals. Everything feeds directly into the dashboard of your digital infrastructure, so remediation can be prioritised alongside Vulnerability Management.
Explainer video
Ensure your entire attack surface is always secure.
How it works
Discover
All internet-facing assets, including shadow IT
Monitor
Continuous, daily updates
Prioritize
Global or per-asset severity
Remediate
Prioritised, alongside Vulnerability Management
Today's threat landscape
Blind spots are growing faster than most security teams can track.
41%
Of external findings are software supply chain failures — outdated third-party components, the #1 external risk for 2 years running
BSO State of VM 2025
26%
Of external findings are cryptographic failures — encryption configured at launch and never revisited
BSO State of VM 2025
17%
Of Danish companies had at least one security breach in the last 12 months
itm8 Cyber Security Survey 2025
Supports compliance
Organisations must control their supply-chain presence under NIS2 and DORA. Understanding your external attack surface is essential to prevent not only cyberattacks, but also potential fines.
Why choose BlackstoneOne's EASM
Real-time visibility and daily updates to your attack surface.
Detailed view of each asset, including why it was pulled in, ownership, connections and pivots.
Customise severity level of risks globally, or on a per-asset basis.
Total visibility into your cloud footprint, so you can identify changes and exposures over time.
Leverage attack surface data throughout your security ecosystem with native integrations and API endpoints.
Understand your overall exposure to zero-day and headline vulnerabilities in minutes, not days or weeks.
Ensure each user receives the right information about your attack surface.
A time-saving, intuitive platform that focuses on ease of use and requires no technical expertise.
Understand your external attack surface to prevent cyberattacks and stay ahead of regulatory fines.
The difference it makes
✗ Without EASM
✗ Shadow IT and unknown assets stay invisible
✗ Attack surface grows undetected as the org scales
✗ No single dashboard of digital infrastructure
✗ Compliance and supply-chain exposure unclear
✓ With BlackstoneOne
✓ Every asset discovered and inventoried, daily
✓ Remediation prioritised alongside Vulnerability Management
✓ One dashboard of your full digital infrastructure
✓ NIS2/DORA-ready supply-chain visibility
The platform
Stay in control of your attack surface with continuous visibility.
Continuously discover, manage, and protect your rapidly growing attack surface, all in one dashboard.
BlackstoneOne Cyber Exposure Management Platform
Get a free trial
Get a free analysis to discover unknown assets on your external attack surface.
Frequently asked
What's the difference between EASM and a vulnerability scan?
A vulnerability scan tests assets you already know about. EASM finds the assets first, including shadow IT and forgotten infrastructure, so nothing is scanned blind.
How is asset discovery performed?
Continuously, from outside your organisation, no agents or installs required. New and changed assets are added to your dashboard automatically.
How does this connect to Vulnerability Management?
Every discovered asset feeds directly into BlackstoneOne's Vulnerability Management, so remediation is prioritised across your full external footprint, not asset by asset.
Do we need technical expertise to use it?
No. The platform is built to be user-friendly and time-saving, with severity ratings and clear next steps for every finding.