Quick Answer
The answer is a local exploit in a service. PrintNightmare, officially tracked as CVE-2021-34527, is a classic local privilege escalation vulnerability because it allows an unprivileged user to leverage the Windows Print Spooler service—a system-level service running with high integrity—to execute arbitrary code with SYSTEM privileges. On the Certified Ethical Hacker CEH exam, this scenario tests your ability to distinguish between local and remote exploits; a common trap is confusing it with remote code execution, but PrintNightmare requires the attacker to already have local access to the target machine. The key memory tip is to remember that any vulnerability in a service that runs as SYSTEM and is triggered from a local account is a local exploit in a service, not a remote one.
This CEH practice question tests your understanding of enumeration and system hacking. 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.
An attacker successfully escalates privileges on a Windows server using a known vulnerability in the Print Spooler service (PrintNightmare). Which type of privilege escalation does this represent?
Local exploit in a service
PrintNightmare is a local exploit in the Print Spooler service.
DLL hijacking
Why wrong: DLL hijacking is a different technique involving malicious DLLs.
SUID abuse
Why wrong: SUID is Unix/Linux specific.
Token impersonation
Why wrong: Token impersonation involves stealing tokens, not exploiting a service.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Local exploit in a service
PrintNightmare is a local exploit that allows an unprivileged user to gain SYSTEM privileges. It is a classic local privilege escalation vulnerability.
Key principle: Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Local exploit in a service
Why this is correct
PrintNightmare is a local exploit in the Print Spooler service.
Related concept
Authentication checks who the user is.
DLL hijacking
Why it's wrong here
DLL hijacking is a different technique involving malicious DLLs.
SUID abuse
Why it's wrong here
SUID is Unix/Linux specific.
Token impersonation
Why it's wrong here
Token impersonation involves stealing tokens, not exploiting a service.
Common exam traps
Logging in proves the user can authenticate. It does not automatically mean the user is allowed to enter privileged or configuration mode. Watch for AAA authorization, privilege level and command authorization details.
Detailed technical explanation
This kind of question is testing the difference between identity and permission. A user may successfully log in to a router because authentication is working, but still fail to enter configuration mode because authorization is missing, misconfigured or mapped to a lower privilege level.
Key takeaway
Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Real-world example
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related CEH questions on access control and AAA configuration.
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FAQ
Enumeration and System Hacking — This question tests Enumeration and System Hacking — Authentication checks who the user is..
The correct answer is: Local exploit in a service — PrintNightmare is a local exploit that allows an unprivileged user to gain SYSTEM privileges. It is a classic local privilege escalation vulnerability.
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related CEH questions on access control and AAA configuration.
Authentication checks who the user is.
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Last reviewed: Jun 21, 2026
This CEH practice question is part of Courseiva's free EC-Council 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 CEH exam.
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