PCI DSS v4.0.1 treats vulnerability management as an ongoing cycle, not as a quarterly scanner job. Requirement 6 covers how vulnerabilities are identified, risk-ranked, and patched. Requirement 11 checks the environment through internal and external vulnerability scans, followed by remediation and rescanning.
The minimum rhythm is fairly clear: internal and external scans are required at least once every three months, and additional scans are required after significant changes. The required quarterly external scan must be performed by a PCI SSC Approved Scanning Vendor (ASV). Internal scans do not need an ASV, but the person performing them needs the right skills and reasonable independence from the systems being scanned.
The awkward part is what happens between those scan dates. A report full of findings does not satisfy the requirement by itself. The team still has to rank the vulnerabilities, fix or otherwise address them as the standard allows, rescan, and keep enough evidence to show that this really happened.
There are several scanning obligations, and they are easy to blur together. This table separates the recurring scans from the scans triggered by a change.
| Activity | Who performs it | Minimum timing | What happens after findings |
| Internal vulnerability scan | Qualified personnel with organizational independence; ASV/QSA not required | At least once every three months | Resolve high-risk and critical findings, then rescan to confirm |
| Quarterly external vulnerability scan | PCI SSC Approved Scanning Vendor (ASV) | At least once every three months | Meet the ASV Program Guide passing-scan requirements and rescan as needed |
| Internal scan after significant change | Qualified personnel with organizational independence | After a significant change | Resolve high-risk and critical findings and rescan as needed |
| External scan after significant change | Qualified personnel with organizational independence; not required to be an ASV | After a significant change | Resolve applicable findings and rescan as needed |
| Vulnerability identification and patching | Internal security, IT, engineering, and system owners | Ongoing | Risk-rank vulnerabilities; critical security patches/updates are installed within one month of release |
Scanning is one input into vulnerability management. It finds weaknesses in systems that are actually in scope. Vulnerability management is the wider process that decides what the findings mean, who owns the fix, how quickly it needs to happen, and how the team proves the issue was dealt with.
Under Requirement 6.3.1, organizations identify new security vulnerabilities from recognized information sources and assign risk rankings that make sense for their own environment. PCI SSC also says internal scan results should feed that process. A scanner score is useful evidence, but the entity does not have to accept an external score blindly if its own environment changes the risk.
For the bigger picture around scope, validation, and where Requirements 6 and 11 sit among the full standard, see our PCI DSS requirements guide.
Internal scans under Requirement 11.3.1 need to happen at least once every three months. The scan tool should be kept current, the person doing the scan should be qualified and reasonably independent of the systems being tested, and high-risk and critical vulnerabilities need to be resolved and confirmed through rescanning.
That independence point is practical rather than ceremonial. PCI SSC gives the example that a network administrator should not be the person responsible for scanning the same network they manage. You can use qualified internal staff or a specialist outside the firm; an ASV is not required for the internal scan.
PCI SSC's May 2025 vulnerability-management FAQ also connects internal scan results back to Requirement 6.3.1 risk ranking and explains how critical, high-risk, and lower-ranked findings are handled.
The required recurring external scan is different. At least once every three months, the external scan used for PCI DSS validation must be performed by a PCI SSC Approved Scanning Vendor using the vendor's approved scanning solution. The result needs to meet the ASV Program Guide requirements for a passing scan, with rescans where needed.
This is one of those controls where scheduling the scan on the last possible day creates unnecessary pain. If the scan finds something, you still need time to fix it and obtain a passing result. PCI SSC describes three months, or 90 days, as the maximum interval and encourages teams to scan earlier when change windows or remediation work could cause a delay.
The Council's ASV resource guide is useful if your team is new to external scans, especially for e-commerce merchants using SAQ A. It also makes one point that is easy to miss: an ASV scan is evidence for a specific PCI DSS requirement, not proof that the organization is PCI DSS compliant overall.
The scan scope has to follow the PCI DSS assessment scope. In practice, that means you cannot build a clean scanning program around a stale IP list while the CDE has changed around it. New cloud services, network paths, admin interfaces, e-commerce systems, third-party connections, and segmentation changes can all alter what needs attention.
Our CDE and PCI DSS scope guide explains how the cardholder data environment, connected-to systems, and security-impacting components fit together. That is the better place to settle scope before arguing about scanner coverage.
Quarterly scans do not replace change-triggered scans. PCI DSS requires additional internal and external vulnerability scans after a significant change, and those scans are in addition to the regular three-month cycle.
A significant change depends on the environment, but PCI SSC gives useful examples: new hardware or software in the CDE, major upgrades, changes to account-data flows, a changed CDE boundary, changes to supporting infrastructure such as directory services or logging, and changes to third-party services that support the CDE.
The examples come from PCI SSC FAQ 1317 on significant change. The useful operating rule is simple enough: if a change can alter exposure or PCI scope, decide during change review whether the scan trigger applies instead of discovering it during the assessment.
There is no single PCI DSS remediation deadline for every vulnerability. The standard treats different findings differently, and the distinction matters.
Requirement 6.3.3 gives a fixed deadline for critical security patches and updates: they must be installed within one month of release. Other applicable patches and updates are installed within time frames the organization defines from its risk assessment. Requirement 11.3.1 also requires high-risk and critical vulnerabilities found by internal scans to be resolved, while lower-ranked vulnerabilities are addressed according to the entity's documented risk in a targeted risk analysis.
PCI SSC explains these links between Requirements 6 and 11 in FAQ 1597. The practical lesson is that "the scanner marked it Medium" is not a remediation policy. The team needs its own risk ranking, owner, deadline, fix or mitigation decision, and evidence.
For the targeted risk analysis side of that decision, see our PCI DSS risk assessment guide.
No. Patching is one remediation method, and an important one, but vulnerability management is wider. Some findings are fixed with a vendor patch. Others need a configuration change, a disabled service, an access-control change, an application fix, a network restriction, or another treatment that actually addresses the weakness.
This distinction is useful when scanners keep rediscovering the same issue. If a ticket says "accepted" but the underlying control never changes, you need to be able to explain why the risk is addressed and which PCI DSS requirement allows that treatment. A spreadsheet full of old exceptions is not the same thing as a working process.
A vulnerability scan is mainly automated and looks for known weaknesses, missing patches, exposed services, and configuration problems. A penetration test is more manual. The tester tries to exploit weaknesses and see what an attacker could actually reach or do.
PCI DSS requires both because they answer different questions. Requirement 11.3 covers vulnerability scanning. Requirement 11.4 covers penetration testing. Passing the quarterly scans does not remove the penetration-testing requirement, and a strong penetration test does not replace the scan cycle.
For the testing side, read our PCI DSS penetration testing requirements guide. It covers Requirement 11.4, testing scope, segmentation testing, retesting, and the evidence expected from the engagement.
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Use the playbook to prepare Requirement 11.4 scope, segmentation testing, evidence, retesting, and the practical work around a PCI DSS penetration test.
Get the PCI DSS Penetration Testing PlaybookThe assessor is looking for the operating trail, not only the latest PDF from a scanner. A clean evidence set normally connects the scan to the scope, the finding to an owner, the remediation to a record, and the rescan to confirmation that the issue was actually dealt with.
Useful evidence usually includes the following items:
For the wider evidence and validation process, including SAQ, ROC, AOC, remediation, and assessor review, see our PCI DSS audit and assessment guide.
Most problems here are not exotic. They are ordinary process gaps that keep repeating until somebody owns the whole loop.
The simplest program is usually the one people can actually run every month. It does not need a complicated maturity model. It needs clear triggers, owners, and evidence.
The point is not to make the scanner happy for one afternoon. The point is to keep known weaknesses moving from discovery to decision to remediation, with enough proof that another person can follow what happened.
A PCI DSS vulnerability scan is useful only when it changes something. If the same findings appear quarter after quarter, the problem is no longer scanner coverage. It is ownership, prioritization, or remediation.
Keep Requirement 6 and Requirement 11 connected. Find the vulnerability, decide what it means in your environment, fix or address it as the standard allows, rescan, and keep the record. That is the part an assessor can actually follow.
Turn scan findings into an assessment-ready remediation plan
If vulnerability findings keep circulating between security, IT, and compliance without a clear owner, we can help turn them into a workable plan.
Internal and required external scans must be completed at least once every three months. PCI DSS also requires additional scans after significant changes, so the quarterly schedule is the minimum rhythm, not the only trigger.
No. Internal scans can be performed by qualified internal staff or an outside specialist. The person performing the scan needs reasonable organizational independence from the systems being scanned.
The required recurring external scan at least once every three months must be performed by an approved ASV. An external scan after a significant change can be performed by qualified, reasonably independent personnel and does not have to be an ASV.
No. It shows that the external scanning requirement was met for that scan. It does not assess the rest of PCI DSS, such as access control, logging, policies, internal scans, or penetration testing.
PCI DSS Requirement 6.3.3 requires critical security patches and updates within one month of release. Other applicable patches use time frames defined from the organization's risk assessment.
No. A targeted risk analysis cannot lower an explicit PCI DSS minimum frequency. Internal and required external scans still need to happen at least once every three months.
No. Scanning mainly finds known weaknesses with automated tools. Penetration testing actively tries to exploit weaknesses and validate what an attacker could do. PCI DSS requires both in different parts of Requirement 11.