- A
Allow any URL that returns a valid HTTP status code
Why wrong: Accepting any valid status code would still permit access to internal services and metadata endpoints.
- B
Use a strict allowlist for outbound destinations and block link-local metadata addresses
This is the best defense because the application is making server-side requests based on user input. A strict allowlist limits which external destinations the service may reach, and blocking link-local or internal addresses prevents access to sensitive metadata services and localhost resources. This directly reduces the risk of server-side request forgery in cloud environments.
- C
Escape all quotation marks before sending the request
Why wrong: Escaping quotes is useful for some injection problems, but it does not stop the server from fetching attacker-controlled URLs.
- D
Require users to change their passwords after each upload
Why wrong: Password changes do not address the application's unsafe outbound request behavior or internal network access.
Quick Answer
The best defensive control is to use a strict allowlist for outbound destinations and block link-local metadata addresses. This directly prevents Server-Side Request Forgery (SSRF) by ensuring the server only makes outbound requests to explicitly approved external domains, while also cutting off access to internal services like the AWS metadata endpoint at 169.254.169.254 and localhost. On the Security+ SY0-701 exam, SSRF mitigation questions often test your ability to distinguish between input validation and network-layer controls—many students mistakenly choose input sanitization, but the core issue is that the server itself is making the request, so you must control where it can go. A common trap is thinking that blocking IP addresses alone is sufficient, but a strict allowlist is stronger because it denies everything by default. Remember the mnemonic “Allow, don’t sanitize” to recall that for SSRF, you should control the destination, not just the input.
SY0-701 Threats, Vulnerabilities, and Mitigations Practice Question
This SY0-701 practice question tests your understanding of threats, vulnerabilities, and mitigations. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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 cloud-hosted application allows users to submit a URL for image processing. Logs show repeated requests such as `http://169.254.169.254/latest/meta-data/` and `http://localhost/admin`. The server is making outbound requests on behalf of the user input. What is the best defensive control to implement?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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
Use a strict allowlist for outbound destinations and block link-local metadata addresses
The requests target the AWS EC2 instance metadata service (169.254.169.254) and localhost, which are classic Server-Side Request Forgery (SSRF) attacks. By using a strict allowlist for outbound destinations and explicitly blocking link-local metadata addresses, the application prevents the server from making unauthorized requests to internal or cloud metadata endpoints, thereby mitigating SSRF.
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.
- ✗
Allow any URL that returns a valid HTTP status code
Why it's wrong here
Accepting any valid status code would still permit access to internal services and metadata endpoints.
- ✓
Use a strict allowlist for outbound destinations and block link-local metadata addresses
Why this is correct
This is the best defense because the application is making server-side requests based on user input. A strict allowlist limits which external destinations the service may reach, and blocking link-local or internal addresses prevents access to sensitive metadata services and localhost resources. This directly reduces the risk of server-side request forgery in cloud environments.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Escape all quotation marks before sending the request
Why it's wrong here
Escaping quotes is useful for some injection problems, but it does not stop the server from fetching attacker-controlled URLs.
- ✗
Require users to change their passwords after each upload
Why it's wrong here
Password changes do not address the application's unsafe outbound request behavior or internal network access.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse SSRF with injection attacks and choose a sanitization option like escaping quotation marks, but the real vulnerability is the server's ability to make outbound requests to arbitrary destinations, which requires network-level controls.
Detailed technical explanation
How to think about this question
The AWS EC2 instance metadata service is accessible at the link-local address 169.254.169.254 and provides sensitive data such as IAM credentials. SSRF attacks exploit this by tricking the server into making requests to that address, which can then be used to escalate privileges. A strict allowlist should only permit known, safe external domains (e.g., image hosting services) and explicitly deny private IP ranges (RFC 1918) and link-local addresses (169.254.0.0/16).
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.
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FAQ
Questions learners often ask
What does this SY0-701 question test?
Threats, Vulnerabilities, and Mitigations — This question tests Threats, Vulnerabilities, and Mitigations — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use a strict allowlist for outbound destinations and block link-local metadata addresses — The requests target the AWS EC2 instance metadata service (169.254.169.254) and localhost, which are classic Server-Side Request Forgery (SSRF) attacks. By using a strict allowlist for outbound destinations and explicitly blocking link-local metadata addresses, the application prevents the server from making unauthorized requests to internal or cloud metadata endpoints, thereby mitigating SSRF.
What should I do if I get this SY0-701 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: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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