CVE-2020-37200Public exploit

Application crash via oversized registration key

Published Feb 11, 2026 · Updated Feb 11, 2026

Stack-based buffer overflow in Nsasoft NetShareWatcher 1.5.8.0 allows local users to crash the application via an oversized registration key. The registration dialog accepts a 1,000-character Key value without enforcing a length bound before writing it to stack storage, corrupting memory when OK is selected. Exploitation requires Windows desktop access and active submission of the crafted key; the demonstrated consequence is an application crash, not code execution.

CVSS severity4.6
Medium
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in Nsasoft NetShareWatcher 1.5.8.0 allows local users to crash the application via an oversized registration key. The registration dialog accepts a 1,000-character Key value without enforcing a length bound before writing it to stack storage, corrupting memory when OK is selected. Exploitation requires Windows desktop access and active submission of the crafted key; the demonstrated consequence is an application crash, not code execution.

The record

CVE
CVE-2020-37200
Published
Feb 11, 2026
Updated
Feb 11, 2026
Vendor
Nsasoft
Product
NetShareWatcher
Classifications
CWE-121, T1499
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.5.8.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Nsasoft · NetShareWatcherversion=1.5.8.0

Published CVSS scores

7.5VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
4.6VulnCheckCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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