This CCSP practice question tests your understanding of cloud application security. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 security engineer is investigating an incident where an attacker exploited a server-side request forgery (SSRF) vulnerability in a cloud application. The application runs on AWS and uses internal metadata endpoints. Which mitigation should be prioritized to prevent future SSRF attacks?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Restrict outbound network access from the application instances using security groups
Option B is correct because restricting outbound network access from application instances using security groups directly prevents the application from reaching the internal metadata endpoint (169.254.169.254) and other internal services. This is a fundamental network-layer control that stops SSRF attacks at the source, regardless of input validation or request inspection, by blocking the outbound traffic that the attacker would exploit.
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.
✗
Implement input validation to block malicious URLs
Why it's wrong here
Input validation can be bypassed by attackers; defense in depth is needed.
✓
Restrict outbound network access from the application instances using security groups
Why this is correct
Blocking outbound traffic to the metadata IP (169.254.169.254) and other internal IPs prevents SSRF exploitation.
Related concept
Read the scenario before looking for a memorised answer.
✗
Deploy a web application firewall (WAF) to inspect outgoing requests
Why it's wrong here
WAF is typically inbound; inspecting outbound traffic is better done at the network layer.
✗
Disable the IMDSv1 endpoint and require IMDSv2 tokens
Why it's wrong here
IMDSv2 reduces risk but still allows access if the token is compromised.
Common exam traps
Common exam trap: answer the scenario, not the keyword
ISC2 often tests the misconception that input validation or WAFs are sufficient to stop SSRF, when in reality the most effective mitigation is network-layer egress filtering that blocks access to internal metadata endpoints.
Detailed technical explanation
How to think about this question
The AWS metadata endpoint at 169.254.169.254 is a link-local address that is not routable and is accessible only from within the instance. By default, security groups allow all outbound traffic, so an SSRF vulnerability can be used to fetch instance metadata (including IAM credentials). Restricting outbound traffic with a security group that explicitly denies access to 169.254.169.254 and other internal IP ranges (e.g., 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16) is a defense-in-depth measure that stops the attack at the network layer, even if the application code is flawed. In practice, many organizations also use VPC endpoints and instance metadata service v2 (IMDSv2) with hop limits to further harden the environment.
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 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
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: Restrict outbound network access from the application instances using security groups — Option B is correct because restricting outbound network access from application instances using security groups directly prevents the application from reaching the internal metadata endpoint (169.254.169.254) and other internal services. This is a fundamental network-layer control that stops SSRF attacks at the source, regardless of input validation or request inspection, by blocking the outbound traffic that the attacker would exploit.
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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