[PCI DSS 3.0] [PCI DSS 3.0] 11.2.3 Perform internal and external scans, and rescans as needed, after any significant change. Sca

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11.2.3 Perform internal and external scans, and rescans as needed, after any significant change. Scans must be performed by qualified personnel.

11.2.3.a Inspect and correlate change control documentation and scan reports to verify that system components subject to any significant change were scanned.
11.2.3.b Review scan reports and verify that the scan process includes rescans until:
• For external scans, no vulnerabilities exist that are scored 4.0 or higher by the CVSS.
• For internal scans, all “high-risk” vulnerabilities as
defined in PCI DSS Requirement 6.1 are resolved.
11.2.3.c Validate that the scan was performed by a qualified internal resource(s) or qualified external third party, and if applicable, organizational independence of the tester exists (not required to be a QSA or ASV).

The determination of what constitutes a significant change is highly dependent on the configuration of a given environment. If an upgrade or modification could allow access to cardholder data or affect the security of the cardholder data environment, then it could be considered significant.
Scanning an environment after any significant changes are made ensures that changes were completed appropriately such that the security of the environment was not compromised as a result of the change. All system components affected by the change will need to be scanned.
 
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