PCI DSS 11.3.2 Explained: External Scan Rules in v4.0 and v4.0.1

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Key Takeaways

• PCI DSS 11.3.2 requires an external vulnerability scan at least every three months, run by a PCI SSC Approved Scanning Vendor, resolved to a passing result with rescans as needed.
• A scan passes only when no vulnerability is scored CVSS 4.0 or higher and no automatic-fail condition is present.
• PCI DSS 11.3.2.1 adds a separate external scan after any significant change. Qualified, independent personnel can run it, so it does not have to be an ASV.
• SAQ A merchants have 11.3.2 and 11.3.2.1 on their form under v4.0 and v4.0.1. Check your SAQ and your acquirer.
• Auditors look for a complete trail: quarterly reports, scope records, rescans and change tickets.

PCI DSS 11.3.2 is the requirement behind every quarterly ASV scan, and assessors check it in almost every PCI assessment. If you searched for the requirement number, you probably want to know what it says, whether it applies to you, and what to show an auditor. The requirement exists because internet-facing systems are the most exposed layer of a cardholder data environment. This guide explains 11.3.2 and its companion 11.3.2.1 in plain English, covers rescans, and ends with an evidence checklist. PCI DSS v4.0.1, published in June 2024, is a limited revision of v4.0 that clarified wording. It did not change the quarterly ASV scan rule. For the wider v4 picture, see our guides to PCI DSS v4.0 ASV scanning and the PCI DSS 4.0.1 deadline.

A disclosure: we are Secusy, an ASV vendor. This guide paraphrases the standard rather than quoting it, and it is not a QSA opinion. Confirm details against the current PCI DSS and with your acquirer.

Key Definitions

PCI DSS 11.3.2: the requirement for external vulnerability scans at least every three months by a PCI SSC Approved Scanning Vendor.

PCI DSS 11.3.2.1: the requirement for an external vulnerability scan after any significant change.

ASV (Approved Scanning Vendor): a company approved by the PCI Security Standards Council to run external scans. See what an ASV is.

Cardholder data environment (CDE): the people, processes and technology that store, process or transmit cardholder data or sensitive authentication data, plus any connected or security-impacting systems.

Passing scan: under the ASV Program Guide, a scan with no vulnerability scored CVSS 4.0 or higher and no automatic-fail condition.

Significant change: a change to the environment that PCI DSS treats as needing re-verification, such as new or replaced systems, changed data flows or a changed CDE boundary.

Attestation of Scan Compliance (ASC): the cover document an ASV issues stating whether the scan passed. See what an ASV report contains.

PCI DSS External Vulnerability Scan Requirements: What 11.3.2 Says in Plain English

PCI DSS 11.3.2 requires external vulnerability scans at least once every three months, performed by an ASV, with vulnerabilities fixed to a passing result and rescans run as needed to confirm the fix.

The requirement has four parts:

1. Frequency: at least once every three months.
2. Who scans: a PCI SSC-approved scanning vendor. An internal scanner or a general-purpose tool does not satisfy it.
3. Outcome: vulnerabilities are resolved, and the ASV Program Guide requirements for a passing scan are met.
4. Rescans: repeat scans as needed to confirm vulnerabilities are resolved.

A passing scan has no finding scored CVSS 4.0 or higher and no automatic-fail condition, such as an unsupported operating system. The merchant defines the scope. The ASV Program Guide expects every public IP address routed to the in-scope environment and every URL that points to those addresses to be included.

What must be scanned. Every internet-facing IP address and system within or connected to the CDE: web and application servers, remote access points and any other internet-accessible system. This is not limited to systems that handle card data. Systems that can affect CDE security through network connectivity are in scope too, and leaving one out is a gap an assessor will find quickly.

First-year exception. For initial PCI DSS compliance, four passing scans in the first 12 months are not required if an assessor verifies three things: the most recent scan passed, you have documented policies requiring scans at least every three months, and any vulnerabilities were corrected as shown by a rescan. In later years, you need passing scans at least every three months.

11.3.2 covers external scanning only. Internal scans fall under a separate requirement, 11.3.1. For how often scans fall due in practice, see how often ASV scans are required, and for the program rules, see the ASV Program Guide explained.

Run your quarterly ASV scan

Start a scan that produces the full report package your assessor expects.

Who Must Comply With PCI DSS 11.3.2

Any merchant or service provider whose validation includes 11.3.2 and who has internet-facing systems in scope. Your SAQ type or Report on Compliance decides whether it appears on your form.

Validation type
11.3.2 on the form?
Note
SAQ A
Yes
Added in v4.0 and still listed after the January 2025 revision, which removed the script requirements but not scanning
SAQ A-EP
Yes
Has always required quarterly ASV scans
SAQ B-IP
Listed by several sources
Confirm on your form, and verify scope
SAQ C
SAQ C
 
SAQ D (merchant)
Yes
 
SAQ D (service provider)
Yes
 
Report on Compliance
Yes, where internet-facing systems are in scope
Level 1 merchants and most service providers
SAQ P2PE
Generally not
Confirm on your form

The SAQ A change surprises many merchants who validated under v3.2.1, when SAQ A carried no scanning requirement. If your checkout redirects to or embeds a third-party payment form, check your SAQ A and ask your acquirer before assuming you are exempt. More detail is in the PCI ASV scan requirements.
The SAQ determines whether the requirement is on your form. Your environment determines what gets scanned. If a public IP or domain routes to systems in scope, it belongs in the scan scope.

PCI DSS 11.3.2.1 and Rescan Rules: Remediation and Significant Change

Two events trigger extra external scans: a failing result, which needs rescans until it passes, and any significant change, which needs its own scan under 11.3.2.1. Both come on top of the quarterly scan.

Rescans after a failed scan

If a scan fails, fix the findings and rescan until the ASV issues a passing result. Keep both the failing and the passing reports, because together they show the remediation loop worked. A failed scan followed by a documented fix and a pass is normal. A failed scan with no follow-up is an audit finding. If a finding looks wrong, use the false positive dispute process rather than ignoring it. For what to do after a fail, see why an ASV scan fails, and check your vendor's rescan policy.

Scans after a significant change (11.3.2.1)

PCI DSS 11.3.2.1 requires an external vulnerability scan after any significant change. Three details matter:

• Findings: vulnerabilities scored CVSS 4.0 or higher must be resolved, with rescans as needed.
• Who can scan: qualified personnel with organisational independence from the people who made the change. The scan does not have to come from an ASV or a QSA.
• It is additional: a significant-change scan does not replace the quarterly ASV scan.

Typical triggers include new or replaced servers, firewalls or load balancers, changed data flows, a moved or resized CDE boundary, and changes to supporting infrastructure or third-party providers. Use the standard's own definition and your change policy to decide what counts. The practical fix is a process. Add a field to your change ticket that flags significant changes, and make the external scan a required step before the ticket closes. Many teams simply use their ASV for this scan to keep one toolset and one evidence format.

See what a passing report looks like

Learn the three parts of an ASV report and what each one proves.

PCI ASV Scan Evidence: What to Keep for Your Auditor

Keep the full ASV report for each quarter, your scope records, every rescan, remediation proof, and change tickets with their post-change scans. An assessor wants to follow the trail from scope to passing result.

Evidence
What it shows
Tip
Four most recent quarterly ASV reports, each in full
Scans happened at least every three months and passed
Keep the three-part report: ASC, summary and vulnerability details
Scope record: every public IP, domain and URL submitted
The scan covered the environment
Reconcile against your asset inventory, DNS and network diagrams each quarter
Scan customer attestation and any special-note declarations
You confirmed scope and addressed flagged items
You must complete the scan customer attestation yourself
Failed reports plus the rescans that followed
Findings were fixed and verified
Keep the pair together, with dates
Remediation records
What was changed and when
Tie each ticket to a finding ID
Dispute, exception or compensating-control records
Contested findings were handled formally
Keep the ASV’s written decision
Scanning policy
Scans are required at least every three months
Needed for the first-year exception
ASV listing proof
Your vendor was on the PCI SSC list at scan time
Save a dated screenshot or note
Change tickets with post-change scans (11.3.2.1)
Significant changes were scanned
Record who scanned and why they qualify as independent
Scan interference notes
IPS or WAF rules did not block the scanner
Document any allowlisting you applied for

Retain the formal reports your ASV issues, not raw scan data or informal summaries. Each should identify the ASV, the scan date, the systems covered, the findings and the pass or fail result. Keep event-driven scans after significant changes separate from the routine quarterly scans, so the trail shows your programme responds to change and is not only calendar-driven. Keep reports for the whole assessment period at minimum, and longer if your retention policy or acquirer requires it. For a wider preparation routine, use the PCI ASV scanning checklist and how to pass an ASV scan the first time.

Common PCI DSS 11.3.2 Audit Findings

Most findings are process gaps, not technical ones: a missed quarter, an incomplete scope, a failing scan with no rescan, or a significant change with no scan.

• A gap longer than three months. One late scan breaks the quarterly pattern. Put the next scan date on a shared calendar with an owner.
• Incomplete scope. New cloud IPs, load balancers, CDN origins and forgotten subdomains are missed. Reconcile the scope against DNS and the asset inventory each quarter.
• A report that is not from an ASV. Internal scanner output does not satisfy 11.3.2. Confirm your vendor is on the PCI SSC list.
• A failed scan with no rescan on file. Always keep the passing report that closed the loop.
• No scan after a significant change. Link change management to scanning so 11.3.2.1 is not left to memory.
• Missing attestation or declarations. The scan customer attestation and special-note declarations must be on file.
• Scan interference. An IPS or WAF that blocks the scanner can invalidate results. Allowlist the ASV and document it.
• Unresolved TLS and certificate findings. These are among the most common failing items. See ASV scan for TLS failures, open ports and ASV failures.

Conclusion

PCI DSS 11.3.2 comes down to four habits: scan externally at least every three months, use an ASV, fix findings until the scan passes, and rescan to prove it. PCI DSS 11.3.2.1 adds one more: scan after any significant change. Auditors rarely fail teams on the technology. They fail them on gaps in the evidence trail. Treat the quarterly scan as more than a box to tick: it is a regular check on your external attack surface as well as a compliance requirement. Build the calendar, tie scanning to change management, and keep every report and rescan together.

Scan already failed?

Turn the findings into a fix list and get back to a passing result.

Frequently Asked Questions

External vulnerability scans at least once every three months, performed by a PCI SSC Approved Scanning Vendor, with vulnerabilities resolved to a passing result and rescans run as needed.
No. 11.3.2 covers the recurring quarterly scan, which must be run by an ASV. 11.3.2.1 covers an extra external scan after any significant change, and qualified personnel with organisational independence can run it. CVSS 4.0 or higher findings must still be resolved.
No. 11.3.2 covers external vulnerability scans. Penetration testing is a separate requirement, 11.4, and is performed by a qualified internal or external tester. Depending on your validation type, you may need both.
At least once every three months, plus after any significant change. After your first year you need passing scans for each three-month period.
The PCI SSC SAQ A form lists 11.3.2 and 11.3.2.1, so SAQ A merchants should expect scanning to apply. Confirm with your acquirer, because this changed from v3.2.1.
No vulnerability scored CVSS 4.0 or higher and no automatic-fail condition, confirmed by a rescan if you had to fix anything.
Not necessarily. For initial compliance, an assessor can accept your most recent passing scan if you have a policy requiring quarterly scans and have corrected any findings, as shown by a rescan.
Full quarterly ASV reports, scope records, attestations, failed reports with their passing rescans, remediation records, and change tickets with post-change scans.

Authored by

Binoy Koonammavu blog image

Binoy Koonammavu, is the Founder and CEO of Secusy ASV, where he helps SMBs and fintech companies meet PCI DSS scanning requirements without the complexity of enterprise-grade tools. His writing focuses on making ASV compliance straightforward for growing businesses.

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