Learn practical ways to prevent cyber attacks through stronger access controls, security updates, employee awareness, backups, monitoring, incident response, and regular security testing.
How to Prevent Cyber Attacks
Preventing cyber attacks is not about relying on a single security product or one-time security review.
Effective cybersecurity combines people, processes, technology, and ongoing risk management. NIST’s Cybersecurity Framework 2.0 provides a structure that organizations can use to understand, assess, prioritize, and communicate cybersecurity efforts, while its Small Business Quick-Start Guide is specifically designed for organizations with modest or limited cybersecurity resources.
The right controls depend on the organization’s systems, information, risk profile, resources, and business requirements.
Use Strong Access Controls
Access should be limited according to what users, applications, and other identities actually need to perform their responsibilities.
Organizations can strengthen access security through:
- Strong and unique passwords
- Multi-factor authentication (MFA)
- Least-privilege access
- Regular review of user permissions
- Removal of unnecessary or inactive accounts
- Appropriate administrative account controls
MFA provides an additional layer of protection when passwords or other credentials are compromised.
Access controls should also be reviewed as employees change roles, leave the organization, or no longer require access to particular systems.
Keep Systems and Software Updated
Security updates and patches address vulnerabilities that may otherwise remain available for exploitation.
Organizations should maintain an appropriate process for identifying available security updates, prioritizing important vulnerabilities, and applying patches according to their risk and operational requirements.
Patch management should cover more than desktop computers. Depending on the environment, this can include:
- Operating systems
- Web applications
- Network devices
- Cloud services
- Business software
- Security appliances
- Connected devices
Vulnerability management is an ongoing process rather than a one-time activity.
Build Employee Security Awareness
Employees can play an important role in preventing phishing, social engineering, credential theft, and other attacks.
Security awareness programs can teach personnel how to recognize suspicious communications, verify unusual requests, protect authentication information, and report potential incidents.
Training should be reinforced with clear procedures. For example, employees should know how to verify requests for sensitive information or financial activity rather than relying solely on urgency or familiarity.
NIST’s small-business cybersecurity resources include workforce-related considerations as part of a broader cybersecurity risk-management approach.
Protect Important Data
Organizations should identify important information and determine who should have access to it.
Depending on the environment, protective measures can include:
- Access controls
- Encryption
- Secure storage
- Data classification
- Appropriate retention practices
- Backups
- Monitoring
Sensitive information should not be accessible to more people or systems than necessary.
Use Reliable Backups
Backups can help organizations recover from incidents that affect the availability or integrity of their data.
Backups should be appropriately protected and periodically tested to verify that recovery is possible.
NIST’s CSF 2.0 recovery guidance specifically emphasizes understanding recovery responsibilities, prioritizing recovery actions, and verifying the integrity of backed-up data before restoration.
A backup that cannot be reliably restored should not be treated as a complete recovery solution.
Secure Cloud and Remote Access
Cloud services and remote-access technologies can become important parts of an organization’s attack surface.
Organizations should review:
- Cloud identities and permissions
- MFA settings
- Administrative accounts
- Remote-access services
- External exposure
- Security configurations
- Logging and monitoring
The appropriate controls depend on the cloud platform, architecture, applications, and services being used.
For organizations requiring deeper technical evaluation of cloud environments, see our cloud security testing service.
Monitor for Suspicious Activity
Prevention should be supported by the ability to detect unusual activity.
Depending on the organization, monitoring can include authentication events, network activity, endpoint activity, cloud activity, application events, and other relevant security signals.
Detection capabilities can help organizations recognize potential incidents earlier and begin appropriate response procedures.
NIST CSF 2.0 includes Detect as one of its six core Functions, alongside Govern, Identify, Protect, Respond, and Recover.
Have an Incident Response Plan
No cybersecurity program can guarantee that an organization will never experience a security incident.
An incident-response plan should establish who is responsible for responding, how incidents are reported, which systems or services are involved, and how internal and external communications should be handled.
Organizations should also periodically review and exercise their response procedures.
NIST’s CSF 2.0 includes Respond and Recover specifically for taking action during cybersecurity incidents and restoring affected capabilities.
Run Vulnerability Assessments
Vulnerability assessments can help organizations identify and prioritize potential security weaknesses across systems within scope.
They can provide broader visibility into vulnerabilities that may require remediation.
For dedicated vulnerability identification and prioritization, see our vulnerability assessment services.
Perform Penetration Testing
Penetration testing provides a different type of information.
Rather than only identifying potential vulnerabilities, an authorized penetration test uses controlled technical testing to evaluate whether selected weaknesses can be exploited and what their potential impact may be.
A penetration test can therefore complement vulnerability assessments and other security controls.
For dedicated technical security testing, see our penetration testing services.
Secure Web Applications and APIs
Businesses increasingly rely on websites, web applications, APIs, and online services.
Security testing can help identify weaknesses involving authentication, authorization, session management, application functionality, and data access.
For dedicated application security testing, see our web application penetration testing service.
Organizations that depend heavily on APIs can also consider dedicated API security testing.
Manage Third-Party and Vendor Risk
Businesses often rely on external providers, software vendors, cloud platforms, contractors, and other third parties.
A weakness in a connected provider can create security risk for the organization.
Third-party risk management can therefore include:
- Reviewing vendor security practices
- Defining contractual security requirements
- Limiting third-party access
- Monitoring relevant connections
- Reviewing significant changes
- Assessing important suppliers according to risk
The appropriate level of oversight should reflect the importance of the relationship and the information or systems involved.
Protect Network Infrastructure
Network security can include architecture, segmentation, access controls, firewalls, secure configurations, monitoring, and vulnerability management.
Organizations can also use authorized security testing to evaluate the effectiveness of selected network controls.
See our network penetration testing service for dedicated internal and external network assessments.
Review Security Regularly
Cybersecurity conditions can change when an organization:
- Adds new applications
- Changes cloud services
- Expands remote access
- Introduces new integrations
- Changes network architecture
- Adds users or systems
- Experiences a security incident
Security reviews should therefore evolve alongside the organization’s technology and business operations.
NIST’s Cybersecurity Framework 2.0 is designed to help organizations continuously manage cybersecurity risk rather than treat cybersecurity as a one-time project.
A Practical Cybersecurity Prevention Checklist
Organizations can use the following as a starting point:
- Enable MFA for important accounts and services
- Use appropriate access controls and least privilege
- Patch and update systems
- Train employees on phishing and social engineering
- Maintain and test backups
- Monitor important systems and accounts
- Maintain an incident-response plan
- Assess vulnerabilities regularly
- Perform penetration testing when appropriate
- Review cloud, network, application, and third-party security
The appropriate controls should be prioritized according to the organization’s actual risks and available resources.
Vulnerability Assessment vs. Penetration Testing
These two services are complementary but not identical.
A vulnerability assessment focuses on systematically identifying and prioritizing potential weaknesses.
A penetration test uses controlled security testing to validate selected weaknesses and evaluate their potential impact.
Organizations may use both approaches as part of a broader cybersecurity program.
Frequently Asked Questions
What Is the Most Important Step to Prevent Cyber Attacks?
There is no single control that prevents every type of attack.
Organizations should use layered security measures based on their systems, risks, and resources. NIST’s CSF 2.0 emphasizes managing cybersecurity through multiple complementary Functions rather than relying on one defensive measure.
How Often Should a Business Review Its Cybersecurity?
There is no universal review schedule that applies to every organization.
Organizations should review cybersecurity according to their risk, technology changes, business requirements, and applicable regulatory or contractual obligations.
Additional review may be appropriate after significant changes or security incidents.
Is Antivirus Software Enough?
No.
Endpoint security software can help detect and prevent certain types of malicious activity, but it does not address every cybersecurity risk.
Organizations also need appropriate access controls, patching, awareness, backups, monitoring, response planning, and other safeguards.
How Can Employees Help Prevent Cyber Attacks?
Employees can help by following security procedures, protecting their credentials, using MFA where available, verifying unusual requests, avoiding suspicious links and attachments, and reporting potential incidents.
How Can a Business Reduce Ransomware Risk?
Organizations can reduce ransomware risk through layered controls such as MFA, timely patching, appropriate access controls, employee awareness, monitoring, and reliable backups.
Recovery planning is also important because preventive controls cannot eliminate every possible incident.
Do Small Businesses Need Cybersecurity?
Yes.
Businesses of different sizes rely on digital systems and can face cybersecurity risks. NIST specifically provides CSF 2.0 resources designed to help small and medium-sized businesses begin and improve cybersecurity risk management.
Does Penetration Testing Prevent Cyber Attacks?
Penetration testing does not prevent every attack.
Its purpose is to identify and validate security weaknesses under controlled conditions so organizations can better understand and address those risks.
Should I Perform a Vulnerability Assessment or Penetration Test?
It depends on the question you need answered.
A vulnerability assessment can provide broader visibility into potential weaknesses, while penetration testing can provide deeper validation of selected security issues.
Some organizations benefit from using both.
How Can a Business Know Whether Its Security Controls Work?
Organizations can use multiple methods, including vulnerability assessments, penetration testing, control evaluations, monitoring, audits, and other security assessments.
No single assessment can establish that an organization is completely secure.
How to Start Improving Your Cybersecurity
Begin by identifying the systems, applications, accounts, information, and services that are most important to the organization.
Then assess the relevant risks, prioritize improvements, implement appropriate safeguards, establish detection and response capabilities, and periodically evaluate whether those measures remain effective.
For organizations that need help turning security findings into a broader strategy, our cybersecurity consulting services can help with security planning and assessment priorities.
Conclusion
Preventing cyber attacks requires a layered approach rather than a single security product.
Strong access controls, MFA, timely updates, employee awareness, reliable backups, monitoring, incident response, vulnerability management, and appropriate security testing can all contribute to reducing cybersecurity risk.
The NIST Cybersecurity Framework 2.0 provides a flexible structure through Govern, Identify, Protect, Detect, Respond, and Recover, while its dedicated small-business guidance helps organizations adapt cybersecurity risk management to their own circumstances.