Tenable is a leader in vulnerability management. Siemserva focuses on Microsoft 365 configuration posture and adds an independent patch double-check.
Tenable (Nessus, Tenable One) is a recognized leader in vulnerability and exposure management across infrastructure. Its strength is finding software vulnerabilities broadly. Siemserva is complementary and Microsoft-focused: it audits Microsoft 365 configuration posture and verifies patch coverage across Microsoft's own APIs, the SaaS control plane Tenable is not built for.
Siemserva runs standalone for full Microsoft 365 posture across configurations, logs, and CVEs, or right alongside Tenable.
| What Tenable does well | Where teams want more |
|---|---|
| Industry-leading vulnerability scanning (Nessus) and exposure management. | Focused on infrastructure vulnerabilities, not Microsoft 365 SaaS configuration posture. |
| Broad asset coverage across on-prem and cloud infrastructure. | Entra ID, Intune, Exchange, SharePoint, Teams, and Purview configuration is not its core. |
| Mature risk scoring and prioritization. | Microsoft-specific compliance mapping is limited. |
| Large ecosystem and integrations. | No agentic remediation of Microsoft 365 misconfigurations. |
| Capability | Tenable | Siemserva |
|---|---|---|
| Infrastructure vulnerability scanning | Core strength | Not a vuln scanner |
| M365 configuration posture | Limited | 650+ checks |
| Microsoft 365 patch verification | Partial | Cross-API double-check |
| M365 compliance mapping | Limited | Native |
| Agentic M365 remediation | No | Yes |
Comparison reflects general capabilities at time of writing and is provided for research. Vendor features change; verify current specifics with each vendor.
Every finding, and the full graph behind it, is yours. Through the Senserva SDK and the Claude MCP you get complete access to the underlying Siemserva data, so you can query it, extend it, and build your own checks, reports, automation, and integrations on top. Nothing is locked away in a vendor cloud, and the data stays with you.
Siemserva does not just record pass or fail. It models your target environment, the identities, devices, applications, policies, and how they relate, as a queryable graph. That makes the data a foundation for new work: custom analysis, threat hunting, and automation, not a static checklist you read once and set aside.
Tenable is best known for Nessus, one of the most widely used vulnerability scanners, and has grown into a full vulnerability and exposure management vendor. Its core competency is discovering assets and the known vulnerabilities (CVEs) they carry.
Tenable Vulnerability Management (cloud) and Tenable One extend scanning into exposure management, correlating vulnerabilities, misconfigurations, and attack paths across IT, cloud, OT, identity, and web apps to prioritize what truly matters.
Tenable enriches findings with CVSS and its own Vulnerability Priority Rating (VPR), which factors in threat intelligence and exploitability so teams remediate the vulnerabilities most likely to be used against them, not just the highest CVSS.
Tenable is a vulnerability and exposure platform spanning infrastructure broadly. For Microsoft 365 specifically, dedicated configuration posture and compliance coverage of Entra ID, Intune, and Purview is a different, complementary lens.
No. Tenable scans infrastructure vulnerabilities; Siemserva audits Microsoft 365 configuration posture and verifies patch coverage. They cover different layers.
No agents and no cloud service. Siemserva reads your tenant through Microsoft's APIs and runs on Windows or Mac. You can explore the whole product first on the free Advanced Microsoft 365 Security Simulator, with no access to your environment at all.
Yes. The Advanced Microsoft 365 Security Simulator and the game let you explore a full scan, the findings, the AI, and the reports for free. Scanning your own tenant uses a license key, and 501(c)(3) nonprofits get the full version free.
Yes. It supports multi-tenant and MSP fleets, with bulk tenant security audits and unified, client-ready reporting across many customers.
Siemserva is built for AI from the ground up and also runs fully without it. Turn it on for AI-enhanced reports and to run the product from Claude, or the AI of your choice, via our market-leading MCP. You bring your own model, so there is no AI markup, and the rich data model keeps calls and cost low.
"We believe Senserva provides a great amount of innovation in the Microsoft security world."
Rich Lilly, Partner, Director of Security, NetrixSee exactly what Siemserva finds on a rich, realistic simulated tenant, no access to your environment needed. Launch it right after install, or ask for a free key. Teams report cutting Microsoft 365 and Azure hardening time by up to 80 percent.
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