NIST SP 800-171 Control 3.14.4: Update Malicious Code Protection
Malware threats evolve constantly, and outdated protection mechanisms leave your systems exposed to new attack vectors. NIST SP 800-171 Control 3.14.4 requires you to establish a disciplined update process for all malicious code defenses. This control ensures your security tools remain effective against current threats.
What this means
Control 3.14.4 mandates that organizations maintain current malicious code protection by promptly deploying new releases, patches, and signature updates as vendors release them. This includes antivirus software, endpoint detection and response (EDR) tools, and any other malware prevention mechanisms in your environment. The intent is to close gaps that attackers exploit through zero-days and known vulnerabilities by keeping your defensive posture aligned with emerging threat intelligence.
How to comply
- 1.Identify all malicious code protection tools deployed across your infrastructure (endpoints, servers, email gateways).
- 2.Subscribe to vendor security bulletins and update notifications from each tool provider.
- 3.Establish a documented update schedule that balances timeliness with operational stability (e.g., within 72 hours for critical patches).
- 4.Test updates in a staging environment before production rollout to prevent system disruptions.
- 5.Deploy updates using automation where possible to ensure consistent coverage and reduce manual errors.
- 6.Log and track all update deployments with timestamps and version changes for audit trails.
- 7.Review update status quarterly to confirm no systems are running outdated signatures or software.
Evidence auditors look for
- Vendor security bulletin subscriptions or update notification logs from antivirus/EDR platforms.
- Patch management policies documenting update schedules and testing procedures.
- Deployment records showing installation dates and version numbers for each tool.
- Configuration management database (CMDB) entries tracking current software versions.
- Change management tickets documenting update approvals and implementation timelines.
- Automated update reports from centralized management consoles (e.g., Windows Update for Business, Tanium).
- Screenshots or reports from security tools confirming current signature/definition dates.
Frequently asked questions
When will FAQs be available?
The FAQ for this control is currently being prepared.
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