This CCSP practice question tests your understanding of cloud application security. 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.
Which THREE of the following are common challenges in securing serverless applications?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Insecure handling of event source inputs
Option B is correct because serverless functions rely on event-driven architectures where inputs from sources like HTTP requests, database changes, or message queues are processed directly. If these inputs are not properly validated and sanitized, attackers can inject malicious payloads (e.g., SQL injection, command injection) that execute within the function's runtime, leading to data breaches or unauthorized actions. This is a primary attack vector unique to serverless, as the function code directly consumes untrusted data without traditional perimeter defenses.
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.
✗
Lack of control over the underlying kernel and OS
Why it's wrong here
Kernel security is the provider's responsibility.
✓
Insecure handling of event source inputs
Why this is correct
Events from various sources may include malicious payloads.
Related concept
Read the scenario before looking for a memorised answer.
✓
Vulnerabilities in third-party libraries and dependencies
Why this is correct
Functions often use open-source packages that may have known vulnerabilities.
Related concept
Read the scenario before looking for a memorised answer.
✓
Increased attack surface due to many small functions
Why this is correct
Each function can be an entry point.
Related concept
Read the scenario before looking for a memorised answer.
✗
Difficulty in applying stateful firewall rules
Why it's wrong here
Serverless functions are stateless and firewalls are less relevant.
Common exam traps
Common exam trap: answer the scenario, not the keyword
ISC2 often tests the misconception that serverless eliminates all infrastructure security concerns, leading candidates to overlook the critical need for input validation and dependency management, while incorrectly assuming that network controls like firewalls are still applicable.
Detailed technical explanation
How to think about this question
Serverless functions, such as AWS Lambda or Azure Functions, execute in isolated containers that are recycled after each invocation, making them inherently stateless. This ephemeral nature means that traditional network security controls like stateful firewalls are ineffective because there is no persistent IP address or session to monitor; instead, security relies on fine-grained IAM roles, API Gateway throttling, and runtime input sanitization. A real-world scenario is the 'Event Injection' attack where an attacker crafts a malicious S3 event notification that triggers a Lambda function, exploiting unsanitized object keys to execute arbitrary code.
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 security analyst at a medium-sized enterprise encounters this scenario during an investigation or architecture review. The correct answer reflects best practice for the specific threat or control described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Security exam questions test whether you can match controls to threats in context — not just recall definitions.
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.
Cloud Application Security — This question tests Cloud Application Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Insecure handling of event source inputs — Option B is correct because serverless functions rely on event-driven architectures where inputs from sources like HTTP requests, database changes, or message queues are processed directly. If these inputs are not properly validated and sanitized, attackers can inject malicious payloads (e.g., SQL injection, command injection) that execute within the function's runtime, leading to data breaches or unauthorized actions. This is a primary attack vector unique to serverless, as the function code directly consumes untrusted data without traditional perimeter defenses.
What should I do if I get this CCSP question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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