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Control Acronym



System And Information Integrity

CMMC Level


800-171 Control #


CMMC Description

Provide protection from malicious code at appropriate locations within organizational information systems.

CMMC Clarification

You can protect your company’s valuable IT system by stopping malicious code at designated locations in your system. Malicious code is program code that purposefully creates an unauthorized function or process that will have a negative impact on the confidentiality, integrity, or availability of an information system. A designated location may be your network device or your computer. Malicious code includes the following, which can be hidden in email, email attachments, web access: * viruses, programs designed to damage, steal information, change data, send email, show messages, or any combination of these things * spyware, a program designed to gather information about a person’s activity in secret, and is usually installed without the person knowing when they click on a link * a trojan horse, a type of malware made to look like legitimate/real software, and used by cyber criminals to get access to a company’s systems. By using anti-malware tools, you can stop or lessen the impact of malicious code. Example You are buying a new computer for your small business and want to protect your company’s information from viruses, spyware, etc. You buy and install anti-malware software.

800-171 Description

Provide protection from malicious code at designated locations within organizational systems.

800-171 Discussion

Designated locations include system entry and exit points which may include firewalls, remote- access servers, workstations, electronic mail servers, web servers, proxy servers, notebook computers, and mobile devices. Malicious code includes viruses, worms, Trojan horses, and spyware. Malicious code can be encoded in various formats (e.g., UUENCODE, Unicode), contained within compressed or hidden files, or hidden in files using techniques such as steganography. Malicious code can be inserted into systems in a variety of ways including web accesses, electronic mail, electronic mail attachments, and portable storage devices. Malicious code insertions occur through the exploitation of system vulnerabilities. Malicious code protection mechanisms include anti-virus signature definitions and reputation- based technologies. A variety of technologies and methods exist to limit or eliminate the effects of malicious code. Pervasive configuration management and comprehensive software integrity controls may be effective in preventing execution of unauthorized code. In addition to commercial off-the-shelf software, malicious code may also be present in custom-built software. This could include logic bombs, back doors, and other types of cyber-attacks that could affect organizational missions/business functions. Traditional malicious code protection mechanisms cannot always detect such code. In these situations, organizations rely instead on other safeguards including secure coding practices, configuration management and control, trusted procurement processes, and monitoring practices to help ensure that software does not perform functions other than the functions intended. [SP 800-83] provides guidance on malware incident prevention.

Other Source Discussion


CIS Control References

CIS Controls v7.1 8.1

NIST 800-53 Control Ref.

NIST SP 800-53 Rev 4 SI-3

CMMC Derived

NIST CSF Control References


NIST 800-171 References

NIST SP 800-171 Rev 1 3.14.2

Applicable FAR Clause

FAR Clause 52.204-21 b.1.xiii

NIST CSF Control Reference

CERT RMM Reference


Modification of NIST 800-171B Reference

NIST 800-171B Reference

UK NCSCCyber Reference

AU ACSC Essential Eight

AS ACSC Reference


Assessment Sub-Criteria 1

SI.1.211.[a] designated locations for malicious code protection are identified; and

Assessment Sub-Criteria 2

SI.1.211.[b] protection from malicious code at designated locations is provided.

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