CVE-2026-4172
Stack-Based Buffer Overflow in TRENDnet TEW-632BRP HTTP Handler
Publication date: 2026-03-16
Last updated on: 2026-03-16
Assigner: VulDB
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| trendnet | tew-632brp | 1.010b32 |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-119 | The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data. |
| CWE-121 | A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
[{'type': 'paragraph', 'content': 'CVE-2026-4172 is a stack-based buffer overflow vulnerability found in the TRENDnet TEW-632BRP router, version 1.010B32. It exists in the HTTP POST request handler within the /ping_response.cgi file. The vulnerability arises from improper handling of the "ping_ipaddr" argument, which when manipulated with crafted input, causes a stack overflow.'}, {'type': 'paragraph', 'content': 'An authenticated attacker can exploit this by sending a specially crafted POST request containing an overly long string in the ping_ipaddr parameter. The vulnerability is due to insufficient length validation before copying the input into a stack variable using an unsafe function, leading to the overflow.'}, {'type': 'paragraph', 'content': 'This flaw can lead to denial of service or potentially allow arbitrary code execution on the device.'}] [1, 2, 3]
How can this vulnerability impact me? :
Exploitation of this vulnerability can compromise the confidentiality, integrity, and availability of the affected device.
- Denial of Service (DoS) by crashing the device.
- Potential arbitrary code execution, allowing an attacker to run malicious code on the device.
- Remote exploitation is possible but requires authentication.
Since the vendor has not provided any patches or mitigations, affected users are advised to consider replacing the product to avoid these risks.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
I don't know
How can this vulnerability be detected on my network or system? Can you suggest some commands?
[{'type': 'paragraph', 'content': 'This vulnerability can be detected by monitoring for authenticated HTTP POST requests to the /ping_response.cgi endpoint containing an unusually long or malformed ping_ipaddr parameter.'}, {'type': 'paragraph', 'content': "A practical detection method involves capturing and inspecting HTTP POST traffic to the device's web interface, specifically looking for the ping_ipaddr argument in requests to /ping_response.cgi."}, {'type': 'paragraph', 'content': 'Since exploitation requires authentication, detection can also include reviewing device logs for suspicious authenticated POST requests with abnormal ping_ipaddr values.'}, {'type': 'list_item', 'content': 'Use network packet capture tools like tcpdump or Wireshark to filter HTTP POST requests to /ping_response.cgi.'}, {'type': 'list_item', 'content': "Example tcpdump command to capture relevant traffic: tcpdump -i <interface> -A 'tcp port 80 and (((ip[2:2] - ((ip[0]&0xf)<<2)) - ((tcp[12]&0xf0)>>2)) != 0)' | grep 'POST /ping_response.cgi'"}, {'type': 'list_item', 'content': 'Use curl or similar tools to test the endpoint with crafted ping_ipaddr parameters to verify if the device is vulnerable.'}] [2, 3]
What immediate steps should I take to mitigate this vulnerability?
[{'type': 'paragraph', 'content': "Immediate mitigation steps include restricting access to the affected device's web interface to trusted users only, as exploitation requires authentication."}, {'type': 'paragraph', 'content': 'Since no official patch or vendor response is available, consider replacing the affected TRENDnet TEW-632BRP device with a more secure alternative.'}, {'type': 'paragraph', 'content': "Implement network-level controls such as firewall rules to limit access to the device's management interface."}, {'type': 'paragraph', 'content': 'If possible, disable or restrict the HTTP POST handler for /ping_response.cgi or apply input validation filters to the ping_ipaddr parameter to prevent buffer overflow conditions.'}, {'type': 'paragraph', 'content': 'Monitor device logs for suspicious activity and unauthorized POST requests to the vulnerable endpoint.'}] [1, 2]