Authenticated Internal Scanning

PCI DSS 4.0.1 requires internal vulnerability scans to be run with authentication whenever systems can accept credentials, and to document any systems that cannot. Operationalize this by creating a credentialed-scanning standard (scope, privilege level, and exceptions), configuring scan engines with managed credentials, and retaining scan configs and results that prove authenticated coverage. ¹

Key takeaways:

• Authenticated internal scanning is the default expectation; unauthenticated scanning needs a documented exception list. ¹
• “Sufficient privileges” means credentials must be able to see patch level, installed software, local configuration, and security settings relevant to vulnerabilities. ¹
• Your evidence should prove operation: credential configuration, scan job settings, results showing “credentialed checks,” and an exception register with compensating approach. ¹

Authenticated internal scanning is one of the fastest ways to reduce blind spots in vulnerability management, and PCI DSS treats it as an explicit internal scanning requirement. If your scanner cannot log in, it often falls back to banner-grabbing and inference. That creates two problems during a PCI assessment: weaker detection (missed vulnerabilities) and weak evidence (you cannot show that you inspected the host’s real state).

PCI DSS 4.0.1 Requirement 11.3.1.2 is narrow but operationally demanding: for internal vulnerability scans, you must (1) run authenticated scans where credentials are possible, (2) document systems that cannot accept credentials, and (3) use credentials with sufficient privileges for those that can. ¹ The fastest path to compliance is to treat this like an access-and-evidence control, not just a scanner setting: define credential standards, implement a credential lifecycle, and produce repeatable artifacts an assessor can test without debates.

Regulatory text

PCI DSS 4.0.1 Requirement 11.3.1.2 states: “Internal vulnerability scans are performed via authenticated scanning as follows: systems that are unable to accept credentials for authenticated scanning are documented, and sufficient privileges are used for those systems that accept credentials for scanning.” ¹

What the operator must do:

1. Default to authenticated scanning for internal scans where a target can accept credentials. ¹
2. Maintain documentation for non-authenticatable systems (the exception population) and be able to explain why they cannot be scanned with credentials. ¹
3. Ensure credentials used have “sufficient privileges” to perform meaningful checks, not just basic login. ¹

Plain-English interpretation (what assessors look for)

• If a host supports a logon method your scanner can use (Windows, Linux, network device CLI/API, cloud VM guest, database), your internal scanning should log in and run credentialed checks. ¹
• If a host cannot support credentialed scanning (for example, a locked-down appliance, certain OT/IoT systems, or devices where enabling remote auth is prohibited by the manufacturer), you need an exception record. ¹
• If you use low-privilege credentials that cannot read installed patches or local config, you have not met “sufficient privileges” even if the scanner technically authenticated. ¹

Who it applies to

Entity types: Merchants, service providers, and payment processors in scope for PCI DSS. ¹
Operational context: Any environment where your people, processes, or systems can affect the security of the cardholder data environment (CDE), including connected systems and shared services that are in scope under your PCI scoping approach. ²

Teams that must be involved (practically):

• Vulnerability Management / Security Engineering (scanner configuration, reporting)
• Identity & Access Management (service accounts, secret storage, rotation)
• Infrastructure teams (Windows, Linux, network, virtualization)
• Application/Platform owners (coverage for “special” systems; exception justification)
• GRC / Compliance (policy, evidence, assessor narrative)

What you actually need to do (step-by-step)

1) Define the authenticated internal scanning standard

Create a short, enforceable procedure that answers:

• Which internal asset classes require credentialed scanning (servers, endpoints, network gear, hypervisors, databases, containers where supported)
• What “sufficient privileges” means for each class (e.g., local admin/root read access; read-only but with rights to query patch/config state; device privilege level that exposes OS version and configuration)
• How exceptions are approved and reviewed
• Where evidence is stored and for how long (aligned to your broader PCI evidence retention approach)

This is a documentation control as much as a technical one. A common failure mode is “the scanner team knows” but nothing is written down for the assessor to test. ¹

2) Build credential sets per platform (and keep them controlled)

Operational pattern that works:

• Windows: domain or local service account with rights to read system info and security configuration; confirm remote management prerequisites (WMI/WinRM/SMB as required by your tool).
• Linux/Unix: SSH credential with sudo rights for required checks; restrict command set where your scanner supports it.
• Network devices: read-only privileged account (or API token) that can retrieve firmware, running config elements relevant to vulns, and installed modules.
• Databases: account with ability to query version and security settings (and patch levels where applicable).

Control the credentials like any other privileged access:

• Store in an approved secrets manager or the scanner’s encrypted credential vault.
• Restrict who can view/export secrets.
• Log access and changes (scanner admin activity and credential updates).

3) Configure scan jobs to prove “credentialed checks” actually ran

For each internal scan policy, configure:

• Target groups that match PCI scope (CDE and in-scope connected systems)
• Credential assignment by asset tag, directory OU, subnet, or dynamic inventory mapping
• Scan templates that enable authenticated checks (disable “unauthenticated-only” templates for standard jobs)

Minimum operability test: pick representative targets and confirm the report output shows authenticated success (many tools label this “credentialed checks,” “local checks,” or “authenticated scan: yes”). Save that proof as an artifact for your next assessment. ¹

4) Create and maintain the “cannot accept credentials” exception register

This is required explicitly. ¹

Your exception register should include, per system (or tightly defined system class):

• Asset identifier(s) and owner
• Business function and PCI scope context
• Reason credentials cannot be used (technical limitation, vendor restriction, safety constraints)
• Alternative approach used (e.g., agent-based assessment, configuration review, vendor attestation, segmented scanning method)
• Review/renewal workflow (who re-evaluates if credentials become possible)

Assessors usually test exceptions for “is it real?” and “is it controlled?” A spreadsheet is fine if it is current, owned, and referenced in the scanning procedure.

5) Demonstrate “sufficient privileges” through a repeatable privilege test

Don’t argue privilege level in the assessment. Pre-prove it:

• For each platform credential, run a validation scan against a known host and confirm it returns patch, installed software, and local configuration findings that an unauthenticated scan would not.
• Document the validation: credential name (not the secret), privilege description, sample target, timestamp, and evidence of successful authenticated results.

6) Operationalize with change management and coverage monitoring

Authenticated scanning breaks when:

• passwords rotate unexpectedly
• hosts move subnets or change domain membership
• firewall rules change
• admin shares/remote services are disabled
• SSH ciphers change

Add two routines:

• Coverage monitoring: track “targets scanned” vs “targets scanned with credentials successfully.” Investigate drops immediately.
• Credential lifecycle: rotate secrets on your schedule and update scanner vaults through an owned runbook.

Daydream can reduce control drift by mapping the requirement to an evidence checklist (policy + operating artifacts), then continuously tracking whether the latest scan jobs show authenticated coverage and whether the exception register matches the current CMDB or asset inventory. This keeps the assessment conversation focused on evidence, not recollection. ¹

Required evidence and artifacts to retain

Keep evidence in an assessor-friendly package by quarter or by scan cycle:

Governance artifacts

• Authenticated internal scanning policy/procedure with owner, approval, and review history ¹
• Roles and responsibilities (scanner admins, system owners, exception approvers)

Technical configuration artifacts

• Scanner configuration screenshots/exports showing:
  • credential sets exist (names/IDs, not secrets)
  • scan templates enable authenticated checks
  • target groups for in-scope assets
• Secrets management controls (access restrictions; change logs where available)

Operating artifacts

• Recent internal scan reports showing authenticated success indicators
• Remediation tickets tied to findings (prove the scans drive action)
• Exception register for systems that cannot accept credentials, with approvals and periodic review evidence ¹
• Credential validation test results demonstrating sufficient privileges ¹

Common exam/audit questions and hangups

1. “Show me that these internal scans are authenticated.” Expect to demonstrate tool output that clearly indicates credentialed checks per host. ¹
2. “Which systems are not credential-scanned, and why?” The exception list must exist and match reality. ¹
3. “What privileges do the scan accounts have?” Be prepared with a platform-by-platform privilege statement and a validation example. ¹
4. “How do you prevent credential exposure?” Show access controls, limited admin rights, and secret storage approach.
5. “How do you know coverage didn’t silently fail?” Show monitoring and investigation of authentication failures.

Frequent implementation mistakes (and how to avoid them)

Mistake	Why it fails in PCI testing	Fix
Running “internal scans” without credentials because it’s easier	Requirement explicitly calls for authenticated scanning, with documented exceptions. 1	Make credentialed scanning the default template; require exception approval for opt-out.
Using credentials that can log in but can’t read patch/config state	“Sufficient privileges” is not met if checks are superficial. 1	Create a privilege validation test per platform and store results.
No exception register (or it’s stale)	You cannot explain gaps, and assessors will sample. 1	Maintain a living exception register tied to asset inventory.
Credential rotation breaks scanning for weeks	Leads to invisible coverage loss and weak operational control	Add coverage monitoring and a credential update runbook owned by named roles.
Evidence is scattered across tools and chat logs	Slows assessment, increases sampling risk	Build an “11.3.1.2 evidence pack” folder with a consistent naming convention.

Risk implications (why this requirement exists)

Authenticated internal scanning reduces false negatives and improves the quality of remediation decisions. Unauthenticated scanning commonly misses local vulnerabilities (missing patches, insecure services, weak local config) because it cannot inspect the host state. For PCI, that translates to higher chance of unresolved vulnerabilities within systems that impact the CDE, and a harder time defending your vulnerability management program during assessment. ¹

Practical execution plan (30/60/90)

30 days (stabilize the control design)

• Publish the authenticated internal scanning procedure with: default credentialed requirement, “sufficient privileges” definitions by platform, and exception workflow. ¹
• Identify in-scope internal asset groups and confirm scanner reachability (routing/firewall).
• Stand up initial credential sets for Windows and Linux; restrict and document access.

60 days (prove coverage and evidence)

• Convert standard internal scan jobs to authenticated templates; validate credential success on representative targets. ¹
• Create the exception register and populate it from asset inventory; get owners to attest to “cannot accept credentials” rationale. ¹
• Produce a first “evidence pack” with scan configs, sample reports showing credentialed checks, and exception approvals.

90 days (operational hardening)

• Add monitoring for authentication failure rates and coverage drops; assign an on-call/queue for scanner auth failures.
• Implement credential lifecycle management (rotation process + scanner vault updates + change record).
• Run an internal mock assessment: sample a set of in-scope hosts, trace from inventory → scan job → authenticated result → remediation ticket → closure evidence.

Frequently Asked Questions

What counts as “authenticated scanning” for PCI internal vulnerability scans?

The scanner must log into the target using credentials (or an equivalent authenticated method) so it can perform deeper checks than network-only probing. You should be able to show scan output indicating credentialed checks succeeded. ¹

Do all internal systems need credentialed scanning?

Systems that can accept credentials should be scanned with authentication, and systems that cannot must be documented. Treat credentialless scanning as an exception, not the standard. ¹

What does “sufficient privileges” mean in practice?

The credential must have enough rights to read the system state that drives vulnerability results (patch level, installed components, and relevant security configuration). Prove it with a validation scan and retain that evidence. ¹

How do we handle appliances or OT/IoT devices that can’t accept scanner credentials?

Put them in a controlled exception register with the reason they can’t accept credentials and the alternative method you use to assess exposure. Keep the register current and owner-approved. ¹

Is an agent-based scanner acceptable for this requirement?

The requirement is outcome-focused: internal scans performed via authenticated scanning, with documented exceptions. If an agent provides authenticated insight equivalent to credentialed checks, document your approach and how it satisfies authenticated coverage. ¹

What evidence is most persuasive to a QSA or internal auditor?

A short procedure, a current exception register, and scan reports that clearly show credentialed checks succeeded for sampled in-scope hosts. Pair that with scan job configuration exports and proof of credential control. ¹

What you actually need to do

Use the cited implementation guidance when translating the requirement into day-to-day operating steps. ³

Footnotes

1. PCI DSS v4.0.1 Requirement 11.3.1.2

2. PCI DSS v4.0.1 Requirement 11.3.1.2; Source: PCI DSS v4.0.1

3. Just Published: PCI DSS v4.0.1