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Common cybersecurity threats include phishing, malware, ransomware, password attacks, service outages, intercepted communications, insider misuse, and software weaknesses or unauthorized access. These categories overlap: phishing can steal a password or deliver malware, and ransomware is a type of malware. They are useful ways to understand risk, not a universally ranked list of the most frequent threats.
What makes a cybersecurity threat risky?
A threat is a potential cause of harm; it becomes a practical risk when it can exploit a weakness in a system and lead to an adverse consequence. The same attack can have different effects depending on what is exposed and how important the affected service or data is. CISA’s NG9-1-1 Cybersecurity Primer provides examples across infrastructure, but it is not a consumer threat ranking.
The eight categories below are an illustrative selection drawn from CISA materials. They are not mutually exclusive: one incident may involve several at once.
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1. Phishing and social engineering
Phishing uses deceptive messages, links, or attachments to persuade someone to reveal information, open harmful content, or install malware. Social engineering is the broader use of deception to influence people. CISA describes phishing this way: “Phishing happens when attackers trick people into clicking harmful links, opening fake emails or downloading malicious attachments.” The definition appears in CISA’s Four Cybersecurity Essentials for SLTTs, published August 29, 2025 (CISA guidance).
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Some attempts are convincing and difficult to distinguish from legitimate requests. Pause before acting on an unexpected request, verify it through a separate trusted channel, and report suspicious messages using the relevant service or organization’s process. CISA’s phishing guidance recommends recognizing and reporting suspicious messages.
2. Malware
Malware is a broad term for malicious software. Depending on its capabilities, it can access, read, change, or steal stored data, compromise a device, or disrupt normal use. A virus is one kind of malware, not a synonym for all malicious software. CISA’s device-data guidance discusses malicious software and ways it can affect data.
3. Ransomware
Ransomware is malware that can deny access to a device or data, often by encrypting files. Some attacks also steal data and threaten to publish or disclose it—a tactic commonly called double extortion. Paying a ransom does not guarantee that files will be restored or that stolen data will remain private. The joint CISA, FBI, NSA, and MS-ISAC StopRansomware Guide covers ransomware behavior and preparation.
For individuals, keeping a separate, usable backup can make recovery more feasible. Organizations also need incident-response planning and controls suited to their systems and operations.
4. Credential and password attacks
Attackers may guess weak passwords, reuse credentials exposed in another breach, or steal logins through phishing. A compromised password can give access to an account, and reused credentials may expose other accounts as well.
Use a unique, strong password for each important account; a password manager can help generate and store them. Turn on multifactor authentication (MFA) wherever available. For important services—especially email, VPNs, and accounts with access to critical systems—the StopRansomware Guide recommends phishing-resistant MFA. These measures reduce risk but cannot make an account invulnerable. CISA’s password guidance and MFA guidance explain these baseline protections.
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5. Denial-of-service and distributed denial-of-service
A denial-of-service (DoS) attack overwhelms a network or service’s resources so ordinary users have difficulty accessing it or cannot access it. A distributed denial-of-service (DDoS) attack sends traffic from many systems. The central effect is loss of availability; it is not, by definition, an attempt to steal data. CISA’s NG9-1-1 primer describes network overload as an example, while a CISA healthcare-sector assessment lists DDoS among threat examples.
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In a man-in-the-middle attack, an attacker secretly relays and may alter communication between two parties who believe they are communicating directly. This can expose information or change what is sent. CISA’s NICCS cybersecurity glossary defines the attack; the NG9-1-1 primer includes interception and monitoring as examples.
7. Insider threats
An insider threat involves risk from someone with authorized access, such as an employee or contractor. A person may misuse that access to steal, corrupt, or destroy data, but not every insider incident is malicious; mistakes and other circumstances can also create exposure. Organizations can reduce potential impact by limiting access to what each role needs and reviewing permissions. CISA’s primer and healthcare-sector assessment include insider threats among their examples; those materials do not establish a current frequency estimate.
8. Software vulnerabilities, spoofing, and unauthorized access
A software vulnerability is a weakness that may be exploited to affect a system or its data. SQL injection is one example: an attacker targets an application’s handling of database queries. The older CISA healthcare-sector assessment lists software vulnerabilities and SQL injection as examples, not as current prevalence measures.
Spoofing and unauthorized access are related security concerns, but they are not synonyms for software vulnerabilities. CISA’s NG9-1-1 primer describes spoofing as an unauthorized device masquerading as an authorized one and also lists unauthorized network access. A weakness may enable unauthorized access, while spoofing describes a way an attacker may impersonate a trusted device or identity.
How can you reduce everyday cyber risk?
For personal accounts and devices, focus on habits that interrupt common paths into your data:
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- Pause and verify unexpected requests before opening links, attachments, or sharing information; report suspicious messages.
- Use unique, strong passwords, consider a password manager, and enable MFA—preferably phishing-resistant MFA where supported for high-impact accounts.
- Install software updates so available security fixes are applied. CISA identifies updates alongside passwords and MFA as foundational practices in its 2025 guidance for state, local, tribal, and territorial governments.
- Back up important files and check that you can recover them. CISA’s backup guidance identifies a secure external hard drive and a properly vetted cloud service as options.
Organizations need additional controls matched to their environment: limiting and reviewing access, protecting critical accounts, preparing response and recovery plans, and maintaining systems. Consumer habits help, but they do not replace organization-level security work.
How should you choose a backup destination?
CISA identifies both a secure external hard drive and a properly vetted cloud service as backup options. Neither is universally superior based on the guidance; consider whether the backup is separated from the device, protected from unauthorized access, and practical to restore when needed.
| Option | Practical consideration |
|---|---|
| Secure external hard drive | Can provide a backup separate from the device when disconnected and stored securely. A drive does not by itself prevent ransomware; recovery depends on the backup being intact and accessible. |
| Properly vetted cloud service | Can keep a copy apart from the local device. Review the service’s security and recovery options and ensure you can access the account when needed. |
For either option, a backup only helps if it is current, protected, and recoverable. CISA’s data backup guidance discusses these destination types.
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Are these the eight most frequent threats?
No ranking is established by the cited CISA materials. They offer threat examples and practical guidance, not a current, comparable prevalence table for these eight categories. The list is an overview to help readers recognize different ways systems, accounts, and data can be affected.
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