SY0-701 Security Operations Practice Question
A critical vulnerability is discovered on an internet-facing VPN appliance that cannot be patched for six weeks because the vendor has not released a fix. The VPN service must remain available. What is the best operational response?
⚠ Common exam trap
Candidates often think leaving the appliance unchanged (Option A) is acceptable if no patch exists, but the exam expects proactive risk reduction through compensating controls rather than passive acceptance of the vulnerability.
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
✓
Apply compensating controls such as restricting source IPs and increasing monitoring.
When a vulnerability cannot be patched immediately, compensating controls such as restricting source IPs via ACLs and increasing monitoring (e.g., enabling detailed logging and alerting on anomalous traffic) reduce the attack surface and improve detection of exploitation attempts. This approach maintains service availability while mitigating risk until the vendor releases a fix.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Leave the appliance unchanged until the vendor releases a patch.
Why it's wrong here
Passive waiting for a vendor patch leaves a known, remotely exploitable vulnerability exposed on an internet-facing device, effectively accepting the risk of unauthorized access. Attackers routinely scan for such flaws within hours of disclosure, and simply keeping the appliance unchanged does nothing to reduce that exposure. Compensating controls should be deployed immediately to shrink the attack surface or detect intrusions, even if they cannot eliminate the underlying flaw, until a patch is available and tested.
- ✓
Apply compensating controls such as restricting source IPs and increasing monitoring.
Why this is correct
When a patch is not yet available, compensating controls such as restricting source IP addresses via firewall allow-lists, enforcing multi-factor authentication, and increasing security monitoring are the appropriate interim measures. These controls reduce the likelihood of exploitation by limiting who can reach the VPN management interface and by generating alerts on abnormal access patterns, while maintaining essential service availability. The goal is to buy time for a proper patch deployment without leaving the device entirely defenseless.
- ✗
Disable all logging so the appliance performs better under load.
Why it's wrong here
Disabling all logging removes the ability to detect, investigate, and reconstruct an exploit attempt on a device that is already under increased risk. Security logs are essential for identifying the source IP, payload, and timeline of an attack, and their absence would let a successful intrusion silently progress to lateral movement or data exfiltration. Instead, logging should be increased and forwarded to a centralized SIEM for real-time analysis, especially during a period of known vulnerability.
- ✗
Replace the VPN with a less secure remote access method to avoid the vulnerability.
Why it's wrong here
Replacing a vulnerable VPN appliance with a less secure remote access method, such as unencrypted Telnet or an Internet-exposed RDP endpoint, introduces greater and easier-to-exploit risks, including cleartext credential interception and unrestricted brute-force attacks. This change does not mitigate the original vulnerability; it merely substitutes a known weakness for an even more dangerous one and likely creates additional management complexity. The correct remediation path is to apply temporary compensating controls and prioritize patch installation, not to downgrade the security architecture.
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Related to this question
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Incident Response Process
Key term
Attack surface
The attack surface is the total sum of all points in a system, network, or application where an unauthorized user can try to enter or extract data.
Key term
Risk
Risk is the possibility that an event or action will negatively affect an organization's ability to achieve its goals, often measured in terms of likelihood and impact.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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