The answer is overwritten adjacent memory regions, as this is the most direct indicator of a buffer overflow vulnerability. When a program writes more data into a buffer than it can hold, the excess data spills into neighboring memory locations, corrupting critical structures like the return address on the stack or heap metadata. This corruption often leads to unexpected program crashes or segmentation faults, because the operating system detects invalid memory access and terminates the process with a SIGSEGV signal. On the Certified Ethical Hacker CEH exam, this concept tests your ability to recognize the fundamental symptom of memory corruption, distinguishing it from other vulnerabilities like SQL injection or XSS. A common trap is confusing a buffer overflow with a simple memory leak; remember that overwriting adjacent regions directly alters control flow, whereas a leak only wastes memory. Memory tip: think of “overflow” as water spilling over a cup’s rim—it soaks the table (adjacent memory) before the cup itself breaks (crash).
CEH Vulnerability Analysis and System Hacking Practice Question
This CEH practice question tests your understanding of vulnerability analysis and system hacking. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 indicators of a buffer overflow vulnerability?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Unexpected program crashes or segmentation faults
A is correct because buffer overflow vulnerabilities often cause unexpected program crashes or segmentation faults. When a program writes data beyond the allocated buffer size, it can corrupt the stack or heap, leading to invalid memory access that the operating system detects and terminates with a segmentation fault (SIGSEGV). This is a classic symptom of overwritten return addresses or other critical control data.
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.
✓
Unexpected program crashes or segmentation faults
Why this is correct
Crashes often occur when memory is corrupted.
Related concept
Read the scenario before looking for a memorised answer.
Read the scenario before looking for a memorised answer.
✗
Use of return-oriented programming (ROP)
Why it's wrong here
ROP is an exploitation technique, not an indicator.
✗
High CPU usage
Why it's wrong here
High CPU usage is not specific to buffer overflow.
✓
Overwritten adjacent memory regions
Why this is correct
Buffer overflow overwrites adjacent memory.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse exploitation techniques (like ROP) with vulnerability indicators, but ROP is a post-exploitation method, not a sign that a buffer overflow exists.
Detailed technical explanation
How to think about this question
Buffer overflows exploit the lack of bounds checking in languages like C/C++ where functions such as strcpy(), gets(), or sprintf() do not validate input length. Under the hood, overwriting adjacent memory regions (option E) can corrupt the saved return address on the stack, allowing an attacker to redirect execution to arbitrary code. In real-world scenarios, the Morris Worm (1988) used a buffer overflow in the fingerd service to propagate, demonstrating how a single unchecked input can compromise entire networks.
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 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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CEH question in full detail.
Vulnerability Analysis and System Hacking — This question tests Vulnerability Analysis and System Hacking — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Unexpected program crashes or segmentation faults — A is correct because buffer overflow vulnerabilities often cause unexpected program crashes or segmentation faults. When a program writes data beyond the allocated buffer size, it can corrupt the stack or heap, leading to invalid memory access that the operating system detects and terminates with a segmentation fault (SIGSEGV). This is a classic symptom of overwritten return addresses or other critical control data.
What should I do if I get this CEH 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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