Quick Answer
SQL injection is the correct choice because directly concatenating unsanitized user input into a SQL query allows an attacker to break out of the intended query structure and execute arbitrary database commands. This vulnerability arises when the application fails to separate code from data, enabling the user’s input to alter the SQL syntax itself. On the CompTIA PenTest+ PT0-002 exam, this scenario tests your ability to identify common injection flaws during code review—a key skill in the attacks and exploits domain. A common trap is confusing SQL injection with cross-site scripting (XSS), but remember that XSS targets browsers with script tags, not database queries. To identify SQL injection vulnerabilities during a penetration test, always look for string concatenation in database calls, especially with parameters like request parameters or form fields. A helpful memory tip: if you see a query built with plus signs or dots joining user input, think “SQLi” first—concatenation equals injection.
This PT0-002 practice question tests your understanding of tools and code analysis. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 tester is reviewing code and sees a function that concatenates user input directly into a SQL query. Which vulnerability is most likely present?
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.
Buffer overflow
Why wrong: Buffer overflow exploits memory boundaries.
SQL injection
Concatenation of input into SQL statements enables SQL injection.
Command injection
Why wrong: Command injection targets system command execution.
Cross-site scripting (XSS)
Why wrong: XSS involves injecting scripts into web content.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
SQL injection
Option A is correct because concatenating input into SQL queries allows SQL injection. Option B is wrong because XSS involves injecting scripts into web pages. Option C is wrong because buffer overflow involves memory corruption. Option D is wrong because command injection targets system commands.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Buffer overflow
Why it's wrong here
Buffer overflow exploits memory boundaries.
SQL injection
Why this is correct
Concatenation of input into SQL statements enables SQL injection.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
Command injection
Why it's wrong here
Command injection targets system command execution.
Cross-site scripting (XSS)
Why it's wrong here
XSS involves injecting scripts into web content.
Common exam traps
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Trap categories for this question
Command / output trap
Command injection targets system command execution.
Detailed technical explanation
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
A security team runs a vulnerability scan on a web application and discovers an unpatched SQL injection flaw. The team prioritises remediation by CVSS score — critical flaws are patched within 24 hours, high within 7 days. Questions like this test whether you understand vulnerability management processes, scanning tools, and remediation prioritisation.
What to study next
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related PT0-002 NAT questions on configuration and troubleshooting.
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FAQ
Tools and Code Analysis — This question tests Tools and Code Analysis — Static NAT maps one inside address to one outside address..
The correct answer is: SQL injection — Option A is correct because concatenating input into SQL queries allows SQL injection. Option B is wrong because XSS involves injecting scripts into web pages. Option C is wrong because buffer overflow involves memory corruption. Option D is wrong because command injection targets system commands.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related PT0-002 NAT questions on configuration and troubleshooting.
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 23, 2026
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