Blackglass

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Blackglass vs Tenable

Tenable tells you whether a host is vulnerable or misconfigured according to its plugin library. Blackglass tells you whether the host still matches the configuration your team explicitly approved — including changes no scanner plugin names yet. Most mid-market teams run Nessus or Tenable.io for VM and add Blackglass when auditors ask 'who changed PermitRootLogin between audits?'

Tenable

Enterprise vulnerability management: Nessus scanners, Tenable.io / Tenable.sc for continuous assessment, patch prioritisation, and compliance reporting (PCI, DISA STIG, CIS). Strong at finding known CVEs, misconfigurations in the scanner's plugin catalogue, and tracking remediation SLAs.

Blackglass

Approved-baseline configuration integrity for Linux. Captures trusted snapshots, diffs every scan against them for sshd, sudoers, listeners, persistence, packages, and file hashes — with human-readable evidence exports. Not a CVE database replacement.

Capability comparison

Drawn from Tenable’s public product pages and Blackglass docs as of May 2026. Capabilities not listed are typically out of scope for both products.

CapabilityTenableBlackglass
Primary signalCVEs, plugin-based misconfigurations, and patch levels — scored and trended for remediation workflows.Deterministic drift against a baseline you captured: every field-level change with before/after and timestamps.
Linux sshd / sudoers driftCovered where a Nessus plugin exists for the specific check; gaps when configs are valid-but-unapproved.First-class: effective sshd -T output, sudoers and drop-ins, compared line-by-line to baseline.
DeploymentNetwork-based scans and/or authenticated scanning agents depending on product line.SSH pull, push agent, or hybrid — no inbound listener required on hosts. Air-gap friendly with self-hosted option.
Compliance evidenceScan reports, dashboards, and ticketing integrations mapped to VM-centric control frameworks.Signed PDF + JSON evidence bundles tied to baseline approval and operator actions — aimed at ITGC / change-control reviewers.
Cloud waste / idle resourcesOut of scope for core VM products.Optional Charon add-on (read inventory + approved cleanup requests) for DO / AWS / GCP.

Pick Tenable when

  • Your primary KPI is CVE exposure, patch compliance, or DISA / PCI scanning cadence.
  • You need a mature ticketing and SLA workflow around scanner findings.
  • You already have Tenable analysts on staff and want one VM platform across OS types.

Add (or pick) Blackglass when

  • Auditors want proof of every configuration change between formal scans, not just point-in-time pass/fail.
  • You keep losing hours to 'something changed on this box' incidents where vulnerability status stayed green.
  • You want calmer, baseline-first alerting for platform / SRE teams without turning them into Nessus experts.

Try Blackglass against the Tenable sales motion

Most prospects evaluating both end up keeping Tenablefor cloud-posture and adding Blackglass for the in-server visibility their existing tool can’t reach. The 14-day trial covers up to 10 hosts and doesn’t need a card.

Open the demo workspaceTalk to sales

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