- A
Weak password policy
Why wrong: Weak passwords could allow unauthorized access, but the scenario specifies exploitation of a vulnerability, not credential theft.
- B
Zero-day vulnerability
A zero-day vulnerability is an unpatched flaw that attackers can exploit, which fits the scenario of a recent update not addressing it.
- C
Misconfigured firewall
Why wrong: A misconfigured firewall might expose services, but the scenario points to a specific application vulnerability.
- D
Social engineering attack
Why wrong: Social engineering tricks users, but the scenario describes exploitation of a software vulnerability, not human manipulation.
Question 610 of 750
Understanding Zero-Day Vulnerabilities and Unauthorized Access
This 220-1202 practice question tests your understanding of logical security concepts. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A server administrator notices that an unauthorized user has been accessing sensitive data by exploiting a vulnerability in a web application. The application was recently updated. What is the most likely cause of this security incident?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"most likely"Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Quick Answer
The answer is a zero-day vulnerability. This is the most likely cause because a zero-day vulnerability is a security flaw unknown to the software vendor, meaning no patch exists at the time of the exploit. Even though the web application was recently updated, the update did not address this specific, undisclosed weakness, allowing an attacker to gain unauthorized access to sensitive data. On the CompTIA A+ Core 2 220-1202 exam, this concept tests your understanding of how attackers exploit the window between a flaw’s discovery and its fix—a common trap is assuming recent updates guarantee complete security. Remember, a zero-day exploit is like a thief finding a hidden, unlocked door the builder didn’t know existed. A helpful memory tip: “Zero-day = Zero defense time.”
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Zero-day vulnerability
The correct answer is B because the question states the application was recently updated, which implies the vulnerability was unknown to the vendor at the time of the update. A zero-day vulnerability is a flaw that is exploited before the vendor has released a patch, making it the most likely cause when an update fails to protect against a newly discovered attack vector.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Weak password policy
Why it's wrong here
Weak passwords could allow unauthorized access, but the scenario specifies exploitation of a vulnerability, not credential theft.
- ✓
Zero-day vulnerability
Why this is correct
A zero-day vulnerability is an unpatched flaw that attackers can exploit, which fits the scenario of a recent update not addressing it.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Misconfigured firewall
Why it's wrong here
A misconfigured firewall might expose services, but the scenario points to a specific application vulnerability.
- ✗
Social engineering attack
Why it's wrong here
Social engineering tricks users, but the scenario describes exploitation of a software vulnerability, not human manipulation.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The CompTIA A+ exam often tests the distinction between a vulnerability that is exploited before a patch exists (zero-day) and a vulnerability that exists despite an update (e.g., unpatched known vulnerability), so candidates may incorrectly choose a misconfiguration or weak password when the key clue is the recent update failing to prevent the exploit.
Trap categories for this question
Scenario analysis trap
Weak passwords could allow unauthorized access, but the scenario specifies exploitation of a vulnerability, not credential theft.
Detailed technical explanation
How to think about this question
A zero-day vulnerability refers to a flaw in software that is unknown to the vendor and for which no patch exists; the term 'zero-day' indicates the developer has had zero days to fix it. In web applications, these often manifest as SQL injection, remote code execution, or cross-site scripting (XSS) flaws that bypass input validation or authentication logic. Real-world examples include the 2021 Apache Log4j vulnerability (CVE-2021-44228), which was exploited as a zero-day in many web applications before a patch was available.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the 220-1202 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
- →
Logical Security Concepts — study guide chapter
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FAQ
Questions learners often ask
What does this 220-1202 question test?
Logical Security Concepts — This question tests Logical Security Concepts — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Zero-day vulnerability — The correct answer is B because the question states the application was recently updated, which implies the vulnerability was unknown to the vendor at the time of the update. A zero-day vulnerability is a flaw that is exploited before the vendor has released a patch, making it the most likely cause when an update fails to protect against a newly discovered attack vector.
What should I do if I get this 220-1202 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
This 220-1202 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 220-1202 exam.
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