How quickly should a payment operator patch a critical vulnerability?

As fast as its risk ranking requires, starting with internet-facing systems that handle card data or credentials. Under PCI DSS requirement 6.3.3, as TrustedSec explains, patches for critical or high vulnerabilities must be installed within one month of release, and many operators set shorter internal targets for internet-facing components. The plan should name an owner per system and a reporting schedule for leadership.

What the standard requires

PCI DSS requirement 6.3.3 asks that security patches be installed within one month of release for critical and high-severity vulnerabilities, with other patches on a risk-based schedule. That is the ceiling. Most operators set shorter targets for internet-facing systems that handle card data, authentication or credentials, often days rather than weeks.

A workable plan

• Rank systems by exposure: internet-facing first, then internal systems touching card data, then the rest.
• Name an owner per system, with authority to schedule a patch window.
• Test the patch in a staging environment that mirrors production.
• Report progress to leadership on a fixed schedule until the patch is complete.

Suppliers count too

A payment platform depends on acquirers, processors, hosting providers and libraries. The plan should include a question to each supplier: are you affected, and when will you be patched? Operators that keep a supplier inventory with security contacts answer that in hours. The vulnerability that matters most may be in a provider's gateway rather than in the operator's own code.