CVE-2020-37196
Denial of Service via Oversized Registration Key in Dnss
Publication date: 2026-02-11
Last updated on: 2026-02-27
Assigner: VulnCheck
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| nsasoft | domain_name_search_software | * |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-120 | The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
CVE-2020-37196 is a denial of service vulnerability in the Dnss Domain Name Search Software. It occurs because the software does not properly check the size of the input in the registration key field, leading to a buffer overflow condition.
An attacker can create a payload of about 1000 characters and paste it into the registration key field, which causes the application to crash.
This vulnerability is classified under CWE-120, which involves buffer copy without size checking.
How can this vulnerability impact me? :
This vulnerability can cause the Dnss Domain Name Search Software to crash, resulting in a denial of service condition.
An attacker with local access and the ability to interact with the user interface can trigger this crash by inputting an oversized registration key.
The impact is primarily on availability, as the application becomes unstable and unusable until restarted.
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 attempting to reproduce the denial of service condition on the Dnss Domain Name Search Software. Specifically, an attacker or tester can generate a payload of approximately 1000 characters and input it into the registration key field of the application to see if it crashes.'}, {'type': 'paragraph', 'content': "A practical detection method involves using a Python script to create a payload file containing 1000 'A' characters, then pasting this payload into the registration key field of the software's registration dialog."}, {'type': 'list_item', 'content': "Run a Python script to generate the payload: \n```python\nwith open('poc.txt', 'w') as f:\n f.write('A' * 1000)\n```"}, {'type': 'list_item', 'content': 'Open the Dnss software registration dialog.'}, {'type': 'list_item', 'content': "Copy the contents of 'poc.txt' and paste it into the registration key field."}, {'type': 'list_item', 'content': "Click 'Ok' and observe if the application crashes, indicating the presence of the vulnerability."}] [2]
What immediate steps should I take to mitigate this vulnerability?
I don't know