COMPARISON · CSURFACE VS QUALYS
Qualys is a consolidated suite for vulnerability management, with an external surface discovery module. CSURFACE is a dedicated platform for discovering and prioritizing the external attack surface. This comparison is honest: it shows where each approach excels so that you can make the right decision for your program.
WHAT IS QUALYS
Qualys is a long-standing platform in vulnerability management. Its cloud-delivered portfolio covers vulnerability detection, configuration assessment, policy compliance, and workload security, often with agent support on the assets. For organizations that need a deep and continuous analysis of their internal park, it is a mature and widely adopted solution in the corporate market.
Within this suite exists an External Attack Surface Management module, focused on discovering exposed assets on the internet. It extends an internally centered program with an external view. This capability is a complementary feature within a broad product, organized alongside other platform modules.
The CSURFACE takes a distinct approach. Instead of covering the entire vulnerability lifecycle, it focuses entirely on the external attack surface: discovering what is exposed on the internet, assigning each asset to the organization, classifying criticality through Machine Learning, and prioritizing based on what is actually exploitable. This dedicated focus is the central difference that this page details.
SIDE BY SIDE
The reading is by capability. Each cell describes, with honesty, the level of delivery of each approach on the external attack surface.
| Capability | Qualys EASM | CSURFACE |
|---|---|---|
| External surface discoveryMapping of exposed assets on the internet | Partial Discovery of external assets as a module within an extensive suite; the product focus remains on internal detection. |
Full The continuous discovery of the external surface is the central objective of the platform, starting from just the root domain. |
| Unrestricted discovery scopeLarger surface coverage | Limited The external surface module operates within scope limits that may require adjustment for larger inventories. |
Full Discovery encompasses all identified external surfaces without a predefined ceiling on assets. |
| Asset attribution and classificationConfirm ownership and criticality | Limited The organization and tagging of discovered assets depend on manual work by the team. |
Full Each asset is attributed to an organization and classified for business criticality through Machine Learning. |
| Shadow IT and subsidiaries coverageAssets outside the official inventory | Limited The external discovery reaches part of these assets, with coverage sensitive to configured scope. |
Full Shadow IT, brands, and subsidiaries enter the scope without prior inventorying. |
| Supply chain digital footprintThird-party components embedded in assets | Does not cover The mapping of third-party components embedded is not part of the external surface module. |
Full Third-party components embedded in assets are mapped as part of the exposure. |
| Vulnerability detection on internal assetsInternal park with agent | Full This is a consolidated strength of Qualys, with agent-based internal detection and broad coverage of the park. |
Does not cover CSURFACE is dedicated to the external surface and does not perform agent-based internal detection. |
| Prioritization by real exploitabilityWhat is being exploited now | Partial Threat intelligence is available in the suite, generally organized into separate modules. |
Full Dynamic prioritization by real exploitability is an integral part of the platform without separate modules. |
| Single and integrated platformCapabilities without stitching between modules | Partial Capabilities are distributed across distinct modules of the suite, which need to be combined. |
Full Discovery, classification, prioritization, and continuous monitoring operate on a single platform. |
| Validation and testing of discovered exposuresConfirm whether an exposed asset is actually exploitable | Partial The external surface module discovers and enumerates the assets and performs a lightweight scan at discovery; full vulnerability and web application testing requires the VMDR and WAS modules, purchased separately. |
Full Exploitability validation of external exposures is built into the platform, with no additional modules. |
This comparison addresses the external attack surface. For capabilities outside this scope—such as agent-based internal detection—the Qualys portfolio is broader, as indicated in the table itself.
DISCOVERY AND VALIDATION
Qualys's external surface module, within CyberSecurity Asset Management, is designed to discover and inventory what is exposed — domains, subdomains, IP addresses, certificates and APIs — with a lightweight scan at discovery. To test and validate those exposures in depth, two separately purchased modules are added: VMDR, for vulnerability scanning, and Web Application Scanning (WAS), for web applications. Enumerating the surface is one step; validating what is actually exploitable requires composing these products.
In CSURFACE, discovery and exploitability validation operate on the same platform. What is discovered already arrives attributed, classified and validated, without relying on separately sold modules.
WHERE CSURFACE DIFFERENTIATES
CSURFACE starts from the root domain and maps all identified external surface assets, with no predefined limit on the number of assets. The team does not need to choose which assets fit within the scope or provide lists to start coverage.
Each discovered asset is automatically attributed to an organization and classified by criticality through Machine Learning, without manual tagging. The result is a prioritizable inventory from the outset, not a list that still needs organizing.
Discovery, classification, prioritization by real exploitability, and continuous operational monitoring all operate on a single platform. There is no need to combine separate sold modules or lose context during transitions between them.
FREQUENTLY ASKED QUESTIONS
This depends on what your organization needs. For vulnerability detection in the internal park with an agent, Qualys has a broad and mature portfolio. For discovering and prioritizing external attack surface, CSURFACE is a dedicated platform for this problem. Many organizations use both approaches complementarily.
There is overlap in the idea of discovering exposed assets. The difference lies in depth and focus: with CSURFACE, the discovery of the external surface, property assignment, and classification by Machine Learning are the central objectives of the product, not a module within an internal detection suite.
There is no predefined ceiling for discovery. The platform maps the entire external surface that it can identify from the root domain, which is relevant for organizations with extensive online presence, multiple brands, or subsidiaries.
Yes, and it is a common arrangement. Qualys covers the depth of internal detection; CSURFACE covers continuous discovery of the external surface and prioritization based on what is exploitable. Both approaches sum up in an exposure program. For more details on your scenario, contact our team through the Contact page.
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