Quick Answer
The answer is remote code execution (RCE). This is correct because the vulnerability allows an attacker to upload a malicious file, such as a web shell, and then execute it on the server, which directly matches the definition of remote code execution. The root cause is the application’s failure to validate file types, contents, or execution permissions, enabling arbitrary code to run in the server’s context. On the Cisco CyberOps Associate 200-201 exam, this scenario tests your ability to map a real-world weakness to the correct vulnerability category, often appearing in multiple-choice questions that describe a file upload flaw without explicitly naming RCE. A common trap is confusing this with “arbitrary file upload” or “path traversal,” but the key is that execution of the uploaded code is the defining feature. Memory tip: think “Upload + Execute = RCE” — if the file can run, it’s not just a file upload; it’s remote code execution.
This 200-201 practice question tests your understanding of 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.
During a vulnerability assessment, a security team discovers that a web application allows users to upload files without proper validation. An attacker could upload a malicious file and execute it on the server. Which type of vulnerability is this?
Cross-site scripting (XSS)
Why wrong: XSS injects client-side scripts, not server-side execution via file upload.
SQL injection
Why wrong: SQL injection targets database queries, not file upload.
Remote code execution (RCE)
Improper file validation can lead to arbitrary code execution on the server.
Insecure direct object reference
Why wrong: This vulnerability exposes internal objects, not code execution.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Remote code execution (RCE)
The vulnerability allows an attacker to upload a malicious file (e.g., a web shell) and then execute it on the server, which is the definition of remote code execution (RCE). This occurs because the application fails to validate file types, contents, or execution permissions, enabling arbitrary code to run in the server's context.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Cross-site scripting (XSS)
Why it's wrong here
XSS injects client-side scripts, not server-side execution via file upload.
SQL injection
Why it's wrong here
SQL injection targets database queries, not file upload.
Remote code execution (RCE)
Why this is correct
Improper file validation can lead to arbitrary code execution on the server.
Related concept
Read the scenario before looking for a memorised answer.
Insecure direct object reference
Why it's wrong here
This vulnerability exposes internal objects, not code execution.
Common exam traps
Cisco often tests the distinction between client-side attacks (XSS) and server-side attacks (RCE), so candidates may confuse file upload RCE with XSS because both involve malicious file or script injection, but the execution context (server vs. client) is the key differentiator.
Detailed technical explanation
Under the hood, RCE via file upload often exploits missing Content-Type validation or lack of file extension whitelisting, allowing an attacker to upload a PHP or JSP file that the web server interprets and executes. In a real-world scenario, an attacker might upload a reverse shell script (e.g., a Python or Perl script) that, when accessed, spawns a shell with the web server's privileges, leading to full server compromise. The vulnerability is exacerbated if the upload directory is within the web root and has execute permissions.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the 200-201 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
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Security Concepts — This question tests Security Concepts — Read the scenario before looking for a memorised answer..
The correct answer is: Remote code execution (RCE) — The vulnerability allows an attacker to upload a malicious file (e.g., a web shell) and then execute it on the server, which is the definition of remote code execution (RCE). This occurs because the application fails to validate file types, contents, or execution permissions, enabling arbitrary code to run in the server's context.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 2026
This 200-201 practice question is part of Courseiva's free Cisco 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 200-201 exam.
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