[Blog](/blog) Show links Resources [Blog](/blog) [Breaches](/breaches) [eBooks, reports, & more](/resources) [Events](/events) [News](/news) [Cybersecurity](/category/cybersecurity) Show links Categories [Attack Surface Management](/category/attack-surface-management) [Company News](/category/company-news) [Compliance and Regulations](/category/compliance-and-regulations) [Cybersecurity](/category/cybersecurity) [Data Breaches](/category/data-breaches) [DevOps](/category/devops) [Human Cyber Risk](/category/human-cyber-risk) [Risks and Vulnerabilities](/category/risks-and-vulnerabilities) [Third-Party Risk Management](/category/third-party-risk-management) [Vendor Risk Management](/category/vendor-risk-management) [What is an Attack Vector? 16 Critical Examples](/blog/attack-vector) Publish date December 1, 2025 {x} minute read # What is an Attack Vector? 16 Critical Examples [Get a demo](/contact-sales) [Free trial](/demo) [Download the PDF guide](/resources/complete-guide-to-attack-surface-management) [Free trial](/demo) Written by [Abi Tyas Tunggal](/team/abi-tyas-tunggal) Writer and Senior Product Manager at UpGuard. Abi's work has influenced leaders across cybersecurity, technology, and financial services. Reviewed by [Greg Pollock](/team/greg-pollock) Director of Research and Insights Greg is a CISA-certified cybersecurity researcher who holds multiple patents for data leak detection. His findings have been featured in The New York Times, Forbes, and Wired. Table of contents eBook A Complete Guide to Attack Surface Management Free resource ### A Complete Guide to Attack Surface Management Monitor and secure your most critical data and assets through Attack Surface Management [Download now](/resources/complete-guide-to-attack-surface-management) In [cybersecurity](https://www.upguard.com/blog/cyber-security), an attack vector is a method of achieving unauthorized network access to launch a cyber attack. Attack vectors allow cybercriminals to [exploit](https://www.upguard.com/blog/exploit) system [vulnerabilities](https://www.upguard.com/blog/vulnerability) to gain access to [sensitive data](https://www.upguard.com/blog/sensitive-data), [personally identifiable information (PII)](https://www.upguard.com/blog/personally-identifiable-information-pii), and other valuable information accessible after a [data breach](https://www.upguard.com/blog/data-breach). With the average [cost of a data breach](https://www.upguard.com/blog/cost-of-data-breach) at $4.35 million, it's important to plan ahead to minimize potential attack vectors and [prevent data breaches](https://www.upguard.com/blog/prevent-data-breaches).[ Digital forensics](https://www.upguard.com/blog/digital-forensics) and [IP attribution](https://www.upguard.com/blog/ip-attribution) are helpful for cleaning up data breaches, but it's much more important to know how you can prevent them. The most[ common attack vectors](https://www.upguard.com/blog/attack-vector) include malware, viruses, email attachments, web pages, pop-ups, instant messages, [text messages](https://www.openphone.com/blog/how-to-schedule-texts/), and [social engineering](https://www.upguard.com/blog/social-engineering). However, the number of [cyber threats](https://www.upguard.com/blog/cyber-threat) continues to grow as cybercriminals look to exploit unpatched or zero-day vulnerabilities listed on [CVE](https://www.upguard.com/blog/cve) and the [dark web](https://www.upguard.com/blog/dark-web), as there is no single solution for preventing every attack vector. Cybercriminals are growing increasingly sophisticated and it is no longer enough to rely on antivirus software as the primary security system. This is why organizations must employ [defense in depth](https://www.upguard.com/blog/defense-in-depth) to minimize [cybersecurity risk](https://www.upguard.com/blog/cybersecurity-risk). ## The Difference Between an Attack Vector, Attack Surface and Threat Vector An [attack vector](https://www.upguard.com/glossary/attack-vector) is a** **method of gaining [unauthorized access](https://www.upguard.com/blog/access-control) to a network or computer system. An [attack surface](https://www.upguard.com/glossary/attack-surface) is the total number of attack vectors an attacker can use to manipulate a network or computer system or extract data. Threat vector can be used interchangeably with attack vector and generally describes the potential ways a hacker can gain access to data or other confidential information. ## Common Attack Vector Examples ### 1. Compromised Credentials **‍**Usernames and passwords are still the most common type of access credential and continue to be exposed in [data leaks](https://www.upguard.com/blog/data-leak), [phishing scams](https://www.upguard.com/blog/phishing), and [malware](https://www.upguard.com/blog/malware). When lost, stolen, or exposed, credentials give attackers unfettered access. This is why organizations are now investing in tools to continuously monitor for [data exposures and leaked credentials](https://www.upguard.com/product/breach-risk). Password managers, [two-factor authentication](https://www.upguard.com/blog/two-factor-authentication) (2FA), [multi-factor authentication](https://www.upguard.com/blog/mfa-multi-factor-authentication) (MFA), and [biometrics](https://www.upguard.com/blog/biometrics) can reduce the risk of leak credentials resulting in a security incident too. ### 2. Weak Credentials **‍**Weak passwords and reused passwords mean one data breach can result in many more. Teach your organization [how to create a secure password](https://www.upguard.com/blog/the-password-security-checklist), invest in a password manager or a single sign-on tool, and educate staff on their benefits. ### 3. Insider Threats **‍**Disgruntled employees or malicious insiders can expose private information or provide information about company-specific [vulnerabilities](https://www.upguard.com/blog/vulnerability). ### 4. Missing or Poor Encryption **‍**Common [data encryption](https://www.upguard.com/blog/encryption) methods like [SSL certificates](https://www.upguard.com/blog/ssl-certificate) and [DNSSEC](https://www.upguard.com/blog/dnssec) can prevent [man-in-the-middle attacks](https://www.upguard.com/blog/man-in-the-middle-attack) and protect the confidentiality of data being transmitted. Missing or poor encryption for data at rest can mean that sensitive data or credentials are exposed in the event of a [data breach](https://www.upguard.com/blog/data-breach) or [data leak](https://www.upguard.com/blog/data-leak). ### 5. Misconfiguration [**‍**Misconfiguration of cloud services](https://www.upguard.com/blog/cloud-misconfiguration), like Google Cloud Platform, Microsoft Azure, or AWS, or using default credentials can lead to data breaches and data leaks, [check your S3 permissions or someone else will](https://www.upguard.com/blog/check-your-amazon-s3-permissions-someone-will). Automate configuration management where possible to prevent configuration drift. ### 6. Ransomware **‍**[Ransomware](https://www.upguard.com/blog/ransomware) is a form of extortion where data is deleted or encrypted unless a ransom is paid, such as [WannaCry](https://www.upguard.com/blog/wannacry). Minimize the impact of [ransomware attacks](https://www.upguard.com/blog/what-is-ransomware-as-a-service) by maintaining a [defense plan](https://www.upguard.com/blog/best-practices-to-prevent-ransomware-attacks), including keeping your systems patched and backing up important data. [Track supply chain risks with this free pandemic questionnaire template >](https://www.upguard.com/blog/free-template-vendor-pandemic-questionnaire) ### 7. Phishing [**‍**Phishing attacks ](https://www.upguard.com/blog/phishing)are [social engineering](https://www.upguard.com/blog/social-engineering) attacks where the target is contacted by email, telephone, or text message by someone who is posing to be a legitimate colleague or institution to trick them into providing [sensitive data](https://www.upguard.com/blog/sensitive-data), credentials, or [personally identifiable information (PII)](https://www.upguard.com/blog/personally-identifiable-information-pii). Fake messages can send users to malicious websites with viruses or malware payloads. [*Learn the different types of phishing attacks here.*](https://www.upguard.com/blog/types-of-phishing-attacks) ### 8. Vulnerabilities **‍**New security vulnerabilities are added to the [CVE](https://www.upguard.com/blog/cve) every day and [zero-day vulnerabilities](https://www.upguard.com/blog/zero-day) are found just as often. If a developer has not released a [patch for a zero-day vulnerability](https://www.upguard.com/blog/cve-2021-26855) before an attack can exploit it, it can be hard to prevent zero-day attacks. [*Learn more about vulnerabilities here.*](https://www.upguard.com/blog/vulnerability) ### 9. Brute Force **‍**[Brute force attacks](https://www.upguard.com/blog/brute-force-attack) are based on trial and error. Attackers may continuously try to gain access to your organization until one attack works. This could be by attacking weak passwords or encryption, phishing emails, or sending infected email attachments containing a [type of malware](https://www.upguard.com/blog/types-of-malware). [Read our full post on brute force attacks](https://www.upguard.com/blog/brute-force-attack). ### 10. Distributed Denial of Service (DDoS) [DDoS attacks are cyber attacks against networked resources](https://www.upguard.com/blog/is-ddosing-illegal) like data centers, servers, websites, or web applications and can limit the availability of a computer system. The attacker floods the network resource with messages which cause it to slow down or even crash, making it inaccessible to users. Potential mitigations include CDNs and [proxies](https://www.upguard.com/blog/proxy-server).   ### 11. SQL Injections **‍**SQL stands for a structured query language, a programming language used to communicate with databases. Many of the servers that store [sensitive data](https://www.upguard.com/blog/sensitive-data) use SQL to manage the data in their database. An [SQL injection](https://www.upguard.com/blog/sql-injection) uses malicious SQL to get the server to expose information it otherwise wouldn't. This is a huge [cyber risk](https://www.upguard.com/blog/cybersecurity-risk) if the database stores customer information, credit card numbers, credentials, or other [personally identifiable information (PII)](https://www.upguard.com/blog/personally-identifiable-information-pii). ### 12. Trojans **‍**Trojan horses are malware that misleads users by pretending to be a legitimate program and are often spread via infected email attachments or fake malicious software. ### 13. Cross-Site Scripting (XSS) [XSS attacks](https://www.upguard.com/blog/cross-site-scripting-xss) involve injecting malicious code into a website but the website itself is not being attacked, rather it aims to impact the website's visitors. A common way attackers can deploy cross-site scripting attacks is by injecting malicious code into a comment e.g. embedding a link to malicious JavaScript in a blog post's comment section. ### 14. Session Hijacking **‍**When you log into a service, it generally provides your computer with a session key or cookie so you don't need to log in again. This cookie can be hijacked by an attacker who uses it to gain access to sensitive information. ### 15. Man-in-the-Middle Attacks **‍**Public Wi-Fi networks can be exploited to perform [man-in-the-middle attacks](https://www.upguard.com/blog/man-in-the-middle-attack) and intercept traffic that was supposed to go elsewhere, such as when you log into a secure system. ### 16. Third and Fourth-Party Vendors **‍**The rise in outsourcing means that your vendors pose a huge [cybersecurity risk](https://www.upguard.com/blog/cybersecurity-risk) to your customer's data and your proprietary data. Some of the [biggest data breaches](https://www.upguard.com/blog/biggest-data-breaches) were caused by third parties. ## Why are Attack Vectors Exploited by Attackers? Cybercriminals can make money from attacking your organization's software systems, such as stealing credit card numbers or online banking credentials. However, there are other more sophisticated ways to monetize their actions that aren't as obvious as stealing money. Attackers may infect your system with [malware](https://www.upguard.com/blog/malware) that grants remote access to a command and control server. Once they have infected hundreds or even thousands of computers they can establish a [botnet](https://www.upguard.com/blog/what-is-a-botnet), which can be used to send [phishing](https://www.upguard.com/blog/phishing) emails, launch other [cyber attacks](https://www.upguard.com/blog/cyber-attack), steal [sensitive data](https://www.upguard.com/blog/sensitive-data), or mine cryptocurrency.   Another common motivation is to gain access to [personally identifiable information (PII)](https://www.upguard.com/blog/personally-identifiable-information-pii), healthcare information, and [biometrics](https://www.upguard.com/blog/biometrics) to commit insurance fraud, credit card fraud or illegally obtain prescription drugs. Competitors may employ attackers to perform [corporate espionage](https://www.upguard.com/blog/corporate-espionage) or overload your data centers with a [Distributed Denial of Service (DDoS) attack](https://www.upguard.com/blog/what-is-a-ddos-attack) to cause downtime, harm sales, and cause customers to leave your business. Money is not the only motivator. [Attackers may want to leak information to the public](https://www.upguard.com/blog/biggest-cyber-threats-for-financial-services), embarrass certain organizations, grow political ideologies, or perform cyber warfare on behalf of their government like the United States or China. ## How Do Attackers Exploit Attack Vectors? There are many ways to expose, alter, disable, destroy, steal or gain unauthorized access to computer systems, infrastructure, networks, operating systems, and [IoT devices](https://www.upguard.com/blog/internet-of-things-iot). In general, attack vectors can be split into passive or active attacks: ### Passive Attack Vector Exploits Passive attack vector exploits are** **attempts to gain access or make use of information from the system without affecting system resources, such as [typosquatting](https://www.upguard.com/blog/typosquatting), [phishing](https://www.upguard.com/blog/phishing), and other [social ](https://www.upguard.com/blog/social-engineering)engineering-based attacks. ### Active Attack Vector Exploits Active cyber attack vector exploits are** **attempts to alter a system or affect its operation such as [malware](https://www.upguard.com/blog/malware), exploiting unpatched [vulnerabilities](https://www.upguard.com/blog/vulnerability), [email spoofing](https://www.upguard.com/blog/email-spoofing), [man-in-the-middle attacks](https://www.upguard.com/blog/man-in-the-middle-attack), [domain hijacking](https://www.upguard.com/blog/domain-hijacking), and [ransomware](https://www.upguard.com/blog/ransomware). That said, most attack vectors share similarities: * The attacker identifies a potential target * The attacker gathers information about the target using [social engineering](https://www.upguard.com/blog/social-engineering), [malware](https://www.upguard.com/blog/malware), [phishing](https://www.upguard.com/blog/phishing), [OPSEC](https://www.upguard.com/blog/opsec), and automated [vulnerability](https://www.upguard.com/blog/vulnerability) scanning * Attackers use the information to identify possible attack vectors and create or use tools to exploit them * Attackers gain unauthorized access to the system and steal [sensitive data](https://www.upguard.com/blog/sensitive-data) or install malicious code * Attackers monitor the computer or network, steal information, or use computing resources. One often overlooked attack vector is your [third and fourth-party vendors](https://www.upguard.com/blog/third-party-vendor) and service providers. It doesn't matter how sophisticated your internal [network security](https://www.upguard.com/blog/network-security) and [information security](https://www.upguard.com/blog/information-security) policies are — if vendors have access to [sensitive data](https://www.upguard.com/blog/sensitive-data), they are a huge risk to your organization. Consider investing in [threat intelligence](https://www.upguard.com/blog/threat-intelligence) tools that help [automate vendor risk management](https://www.upguard.com/blog/automate-vendor-risk-management) and automatically monitor your vendor's security posture and notify you if it worsens. ## How to Defend Against Common Attack Vectors To address common attack vectors, security controls must spread across the majority of the attack surface. The process begins by identifying all possible entry points into your private network - a delineation that will differ across all businesses. The following cyber defense strategies will help you block frequently abused entry points and also highlight possible regions in your ecosystem that might be housing attack vectors. * **Create secure IoT credentials **- Most IoT devices still use their predictable factory login credentials, making them prime targets for DDoS attacks. * **Use a password manager **- Password managers ensure login credentials are strong and resilient to brute force attacks. * **Educate employees **- To prevent staff from falling common for social engineering and phishing tactics, they need to be trained on how to identify and report potential cybercriminal activity. Humans will always be the weakest points in every security program. * **Identify and shut down data leaks** - Most businesses are unknowingly leaking sensitive data that could facilitate data breaches. A[ data leak detection solution]() will solve this critical security issue. * **Detect and remediate all system vulnerabilities** - This should be done for both the internal and external vendor networks. [Cyber risk remediation software ](https://www.upguard.com/product/vendor-risk/risk-remediation)can help you do this. * **Keep antivirus software updated** - Updates keep antivirus software informed of the latest cyber threats roaming the internet. * **Keep third-party software regularly updated **- Software updates contain critical patches for newly discovered attack vectors. Many cyber attackers have achieved success by abusing known vulnerabilities in out-of-date software. ## Secure Your Attack Vectors With UpGuard UpGuard monitors both internal and external third-party attack surfaces for common attack vectors and potential data leaks. By helping security teams rapidly identify and shut down vulnerabilities before they're discovered by cybercriminals, UpGuard offers unprecedented protection against data breaches and supply chain attacks. Watch the video below to learn how UpGuard can help compress your attack surface to reduce your data breach risks. [Experience UpGuard’s attack surface management features with this self-guided product tour >](https://upguard.navattic.com/ox03gwy?ref=blog) eBook A Complete Guide to Attack Surface Management Free resource ### A Complete Guide to Attack Surface Management Monitor and secure your most critical data and assets through Attack Surface Management [Download now](/resources/complete-guide-to-attack-surface-management) ## Related posts Learn more about the latest issues in cybersecurity. Cybersecurity #### [12 Cybersecurity Horror Stories of 2026 (No Costume Required)](/blog/cybersecurity-horror-stories-2026) A warning ignored once becomes a headline. Read more about these 12 real 2026 cybersecurity incidents, and the sign each one gave before it made the news. [](/team/revashni-moodley) [Revashni Moodley](#) September 28, 2026 Cybersecurity #### [Left Unsupervised: 10 Times Access Outlived Its Authorization](/blog/10-times-access-outlived-authorization) Access granted once shouldn’t mean access forever. Read more on how unmonitored access caused 10 of these real-life breaches and what they taught us. [](/team/revashni-moodley) [Revashni Moodley](#) August 25, 2026 Cybersecurity #### [Surviving a LockBit Ransomware Attack: The ROI of Visibility](/blog/surviving-a-lockbit-ransomware-attack) Read how veteran CISO Nick Gicinto saved his alma mater from a LockBit ransomware attack by discarding the standard playbook. [](/team/nicholas-sollitto) [Nicholas Sollitto](#) June 1, 2026 Cybersecurity #### [Top 10 Security Events of 2025](/blog/top-security-events-of-2025) Recap the ten most impactful events that reshaped the cybersecurity industry this year and the critical lessons each had to teach us. Read more here. [](/team/revashni-moodley) [Revashni Moodley](#) January 7, 2026 Cybersecurity #### [Risk Automations: The Shift From Catch-Up to Command](/blog/risk-automations-shift-catch-up-to-command) Connect intelligence to system execution with Risk Automations, your new resolution layer for risk. Reduce remediation from hours to seconds - read more. [](/team/revashni-moodley) [Revashni Moodley](#) December 1, 2025 Cybersecurity #### [Shai-Hulud's True Lesson for CISOs: A Crisis of Communication](/blog/shai-hulud-lesson-for-cisos) Shai-Hulud was driven by a communication crisis between security and engineering. Get a CISO's perspective on how to finally bridge this gap. [](/team/phil-ross) [Phil Ross](#) September 3, 2026 [All posts](/blog) Experience superior visibility and a simpler approach to cyber risk management [Get a demo](/contact-sales) [Free trial](/demo)