CISO Tribune

Vendor comparison · 2 companies

Nucleus Security vs Tenable

Nucleus Security sells vulnerability and exposure management software for enterprise organizations and government agencies. Tenable sells Tenable One, a platform that unifies security visibility, insight and action across an attack surface. CISO Tribune files both under Vulnerability management. This page sets the two records side by side: what each sells, where it is based, who owns and funds it, the customers it names and its recent news, each fact numbered to its source.

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Up to four companies side by side.

  • Nucleus Security
  • Tenable
Nucleus Security vs Tenable: Products, Customers and Funding Compared
Nucleus SecurityNucleus Security sells vulnerability and exposure management software for enterprise organizations and government agencies.nucleussec.comTenableTenable sells Tenable One, a platform that unifies security visibility, insight and action across an attack surface.tenable.com
What it sells
  • Nucleus Data Core[5]A system of record for assets, exposures, and threats.
  • Nucleus ServiceNow App connector[7]A connector that integrates with ServiceNow through the Nucleus Security for Vulnerability Response app.
  • Tenable One[2][3][4][8]A platform that unifies security visibility, insight and action across an attack surface.
Categories
Headquarters
Not stated on its pagesNot stated on its pages
Founded
Not stated on its pages2002
Ownership and funding
Not stated on its pagesNot stated on its pages
Named customers
Not stated on its pagesNot stated on its pages
Recent news
Not stated on its pagesNot stated on its pages
G2 and Gartner Peer Insights
  • G2: listed, seen November 10, 2026[12]
  • Gartner Peer Insights: Not stated on its pages
Who it fits
Not written yetTenable describes converged OT and IT environments among the environments it covers. Tenable's pages cover multi-cloud and hybrid cloud environments, and Active Directory and Entra ID identity environments. Tenable describes highly dynamic cloud or remote workforce assets among those its asset discovery covers.
Last verified
November 8, 2026November 5, 2026

Where they overlap

  • Vulnerability management is the primary category of both Nucleus Security and Tenable.

Where they differ, field by field

  • Nucleus Security is also filed under Exposure prioritisation and CTEM and Threat intelligence. Tenable is also filed under External attack surface management, Cloud-native application protection (CNAPP) and OT and ICS security.
  • Nucleus Security lists Nucleus Data Core and Nucleus ServiceNow App connector. Tenable lists Tenable One.
  • Tenable was founded in 2002.

How they differ

CISO Tribune files Nucleus Security under Vulnerability management, Exposure prioritisation and CTEM, and Threat intelligence, with Vulnerability management as its primary category. CISO Tribune files Tenable under Vulnerability management, External attack surface management, Cloud-native application protection (CNAPP), and OT and ICS security, also with Vulnerability management as its primary category. Both companies therefore sell in vulnerability management, but the other categories they are filed under differ.

Nucleus Security sells vulnerability and exposure management software for enterprise organizations and government agencies. Its Nucleus Data Core is a system of record for assets, exposures, and threats, and Nucleus Helix runs on it. Nucleus also sells a connector that integrates with ServiceNow through the Nucleus Security for Vulnerability Response app. It ingests and normalizes data from a customer's tools into one hub, and its remediation workflows prioritize, ticket, assign owners, and track SLA performance. For federal agencies and contractors, Nucleus offers POAM automation.

Tenable sells Tenable One, a platform that unifies security visibility, insight and action across an attack surface. Tenable One maps the attack surface across infrastructure, cloud, identity, OT, third-party applications and AI, and Tenable Hexa AI is its agentic layer. Tenable also describes cloud security covering multi-cloud and hybrid environments, identity security for Active Directory and Entra ID, and a unified solution for converged OT/IT environments. Tenable Security Center is managed on premises, while Tenable One Vulnerability Management is managed in the cloud. Among Nucleus Security's named customers is TRUESEC, a European MSSP that worked with Nucleus to unify customer data and automate remediation workflows. Tenable was founded in 2002.

What it sells: Nucleus Security

What Nucleus Data Core does[5]
The Nucleus Data Core is a system of record for assets, exposures, and threats. The Nucleus Data Core transforms fragmented data into unified, live exposure context. Nucleus says every AI decision and action is grounded in the Nucleus Data Core.
What Nucleus ServiceNow App connector does[7]
The Nucleus ServiceNow App connector integrates directly with ServiceNow through the Nucleus Security for Vulnerability Response app. The app runs directly on a customer's ServiceNow environment and enables integration with Vulnerability Response. The app has several different integrations, including assets and vulnerable items.

What it sells: Tenable

What Tenable One does[2][3][4][8]
Tenable One maps the attack surface across infrastructure, cloud, identity, OT, third-party applications and AI. Tenable Hexa AI is the agentic layer of Tenable One.

Questions about Nucleus Security and Tenable

What do Nucleus Security and Tenable sell?
Nucleus Security sells Nucleus Data Core and Nucleus ServiceNow App connector. Tenable sells Tenable One.
Are Nucleus Security and Tenable in the same category?
Yes. Vulnerability management is the primary category of both on CISO Tribune.
When were Nucleus Security and Tenable founded?
Tenable was founded in 2002.
Who are Nucleus Security and Tenable sold to?
Tenable describes converged OT and IT environments among the environments it covers.

About Nucleus Security

Nucleus Security sells vulnerability and exposure management software for enterprise organizations and government agencies. Nucleus unifies exposure data, tracks what is being exploited in the wild, and uses AI to build the program. Nucleus says AI is accelerating how fast new vulnerabilities are found and exploited, and that traditional programs cannot keep pace.[1][3][4]

Nucleus Helix drives specialized AI models and agents that build and maintain the program and close exposure gaps. Nucleus Helix runs on the Nucleus Data Core. The Nucleus Data Core is a system of record for assets, exposures, and threats that transforms fragmented data into unified, live exposure context.[5]

Nucleus ingests, correlates, and normalizes data from all of a customer's tools into one hub for unified risk visibility and reporting. Nucleus centralizes exposure management and unifies data from asset discovery, vulnerability scanners, exposure validation, and threat intelligence. Nucleus lets customers customize risk scoring and prioritize risk with asset context and business impact. Nucleus Insights agentic intelligence feed validates exploit and malware evidence. Nucleus offers application security capabilities with unified visibility, exposure prioritization, and automated ownership assignment. Nucleus addresses dynamic cloud environments, including findings sprawl and ephemeral assets.[1][2][3][4]

Nucleus remediation workflows prioritize, ticket, assign owners, and track SLA performance. Nucleus operationalizes ownership metadata in the Nucleus Dynamic Automation Framework to adapt ownership assignment as the business evolves. Nucleus tracks the status of tickets with bi-directional integration and updates when new data is ingested or a status changes. Nucleus lets customers set time limits and document approvals for risk exceptions. Nucleus lets customers define SLAs and monitor ticket status and resolutions over time.[6]

The Nucleus ServiceNow App connector integrates directly with ServiceNow through the Nucleus Security for Vulnerability Response app. The Nucleus Security for Vulnerability Response app runs directly on a customer's ServiceNow environment and enables integration with Vulnerability Response. The Nucleus Security for Vulnerability Response ServiceNow app has several different integrations, including assets and vulnerable items. The app is intended to be installed and configured by a Nucleus Security for Vulnerability Response specialist alongside a ServiceNow administrator with experience with ServiceNow SecOps Vulnerability Response.[7]

CMMC 2.0 is the Department of War (formerly Department of Defense) framework for protecting Federal Contract Information (FCI) and Controlled Unclassified Information (CUI) across the Defense Industrial Base (DIB). Nucleus operationalizes and centralizes evidence, monitors weaknesses, prioritizes risk-based fixes, and proves outcomes across teams and systems for core security controls. Nucleus automatically turns critical findings into tracked incidents with owners, actions, and documented resolution. Nucleus maps findings to NIST 800-171 controls and generates and manages POA&Ms. Nucleus offers POAM automation for the POAM process from vulnerability identification to reporting, for federal agencies and contractors.[8][9]

Nucleus offers two license tiers for unified vulnerability management. Nucleus pricing is affected by the number and type of assets in a customer's environment. Nucleus defines an asset as anything that can have a finding, including physical devices, cloud services, code repositories, and applications. TRUESEC, a European MSSP, unified customer data, automated remediation workflows, and scaled its services in partnership with Nucleus. Nucleus experts researched every new KEV addition between October 2025 and March 2026 and captured their observations in a report. Nucleus Security has published new CVE research in a company white paper.[1][2][4][5][6][10][11]

Nucleus Security on the record

Sources

Nucleus Security full record

  1. [1]nucleussec.comNucleus Security · nucleussec.com · undated page, accessed November 8, 2026 · Tier A
  2. [2]PlatformNucleus Security · nucleussec.com · undated page, accessed November 8, 2026 · Tier A
  3. [3]Nucleus Vulnerability & Exposure Management SolutionsNucleus Security · undated page, accessed November 10, 2026 · Tier A
  4. [4]Nucleus Security | Vulnerability and Exposure ManagementNucleus Security · undated page, accessed November 10, 2026 · Tier A
  5. [5]Nucleus Vulnerability Management PlatformNucleus Security · undated page, accessed November 10, 2026 · Tier A
  6. [6]Vulnerability Remediation with NucleusNucleus Security · undated page, accessed November 10, 2026 · Tier A
  7. [7]ServiceNow App for Vulnerability ResponseNucleus Security · undated page, accessed November 10, 2026 · Tier A
  8. [8]Operationalize CMMC 2.0 Compliance with NucleusNucleus Security · undated page, accessed November 10, 2026 · Tier A
  9. [9]Get Started Nucleus POAMNucleus Security · undated page, accessed November 10, 2026 · Tier A
  10. [10]Nucleus PricingNucleus Security · undated page, accessed November 10, 2026 · Tier A
  11. [11]Risk-based Vulnerability Management | Nucleus SecurityNucleus Security · undated page, accessed November 10, 2026 · Tier A
  12. [12]Nucleus Reviews 2026: Details, Pricing, & FeaturesG2 · undated page, accessed November 10, 2026 · Tier C

Tenable full record

  1. [1]About usTenable · tenable.com · undated page, accessed November 5, 2026 · Tier A
  2. [2]Vulnerability and exposure management | Cloud and AI security | Tenable®Tenable · undated page, accessed November 10, 2026 · Tier A
  3. [3]Tenable One Vulnerability Management | Tenable®Tenable · undated page, accessed November 10, 2026 · Tier A
  4. [4]Tenable One Pricing | Tenable®Tenable · undated page, accessed November 10, 2026 · Tier A
  5. [5]Tenable One exposure management platform and products | Tenable®Tenable · undated page, accessed November 10, 2026 · Tier A
  6. [6]AI security solutions | Tenable®Tenable · undated page, accessed November 10, 2026 · Tier A
  7. [7]ISO/IEC 27001/27002 | Tenable®Tenable · undated page, accessed November 10, 2026 · Tier A
  8. [8]Tenable One connectors | Tenable®Tenable · undated page, accessed November 10, 2026 · Tier A
  9. [9]Tenable Trust PortalTenable · undated page, accessed November 10, 2026 · Tier A
  10. [10]Tenable Vulnerability Management Reviews 2026G2 · undated page, accessed November 10, 2026 · Tier C
  11. [11]Tenable Reviews, Ratings & Features 2026Gartner Peer Insights · undated page, accessed November 10, 2026 · Tier C

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