PCI DSS 11.3.1: External Vulnerability Scans via Approved Scanning Vendors
External vulnerability scanning is a cornerstone of PCI DSS compliance, requiring organizations to identify and address security weaknesses before attackers exploit them. Control 11.3.1 mandates quarterly scans by PCI SSC Approved Scanning Vendors to ensure consistent detection of external-facing vulnerabilities. Understanding this requirement helps you maintain a secure perimeter and demonstrate due diligence to auditors.
What this means
PCI DSS 11.3.1 requires that external vulnerability scans—assessments of publicly accessible systems and networks—be conducted at least once every three calendar months by a PCI SSC Approved Scanning Vendor (ASV). These scans must identify potential weaknesses in firewalls, web applications, DNS servers, and other internet-facing infrastructure. The control ensures that vulnerabilities are detected and remediated on a predictable schedule, reducing the window of exposure to threats.
How to comply
- 1.Identify and contract with a PCI SSC Approved Scanning Vendor from the official ASV list
- 2.Schedule quarterly scans at regular intervals (every 90 days or fewer)
- 3.Provide the ASV with complete network documentation and scope of assets to scan
- 4.Review scan reports for identified vulnerabilities within 30 days of receipt
- 5.Develop a remediation plan for each vulnerability found, prioritizing by severity
- 6.Verify fixes and request re-scans to confirm vulnerabilities are resolved
- 7.Maintain all scan reports and evidence of remediation for audit purposes
- 8.Ensure scans cover all external-facing systems including web applications and remote access points
Evidence auditors look for
- PCI SSC Approved Scanning Vendor quarterly scan reports with dates and findings
- Vendor attestation letter confirming ASV status and scan completion
- Vulnerability remediation tickets linked to scan findings
- Re-scan reports showing resolution of previously identified vulnerabilities
- Network architecture documentation defining scope of external systems
- Scan scheduling calendar or contract with ASV confirming quarterly frequency
- Email correspondence with ASV requesting and receiving scan results
Frequently asked questions
When will FAQs be available?
The FAQ for this control is currently being prepared.
GRCWatch automates quarterly ASV scan scheduling, tracks vulnerability remediation status, and consolidates scan reports in a single dashboard—eliminating manual follow-ups and ensuring no quarterly scan deadline is missed.
See how GRCWatch handles this control automatically
Start free trial