# CVE-2020-37200: NetShareWatcher 1.5.8.0 - 'Key' Denial of Service

> Attackers can crash the NetShareWatcher application by entering oversized data into the registration key field, causing a buffer overflow.

- **Severity:** Medium 4.6 (`CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 11 Feb 2026
- **Updated:** 27 Oct 2026
- **Also known as:** GHSA-mqpv-gcv6-r5w9

## What is CVE-2020-37200?

CVE-2020-37200 is a medium-severity memory corruption vulnerability in Nsasoft Nsauditor NetShareWatcher, published on 11 Feb 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

NetShareWatcher 1.5.8.0 contains a buffer overflow vulnerability in the registration key input that allows attackers to crash the application by supplying oversized input. Attackers can generate a 1000-character payload and paste it into the registration key field to trigger an application crash.

Weakness: CWE-121 (Stack-based Buffer Overflow)

## Which versions are affected by CVE-2020-37200?

It affects 1 product.


Products: Nsasoft Netsharewatcher.

## How do I fix CVE-2020-37200?

No fix has been published for CVE-2020-37200 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-37200 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2020-37200 exists.

## Other vulnerabilities in Nsasoft Nsauditor NetShareWatcher

- [CVE-2020-37201](https://insights.sbomify.com/CVE-2020-37201/): NetShareWatcher 1.5.8.0 - 'Name' Denial Of Service (medium 4.6)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-37200 and fix it if it is affected.

What it is: CVE-2020-37200 is a medium-severity memory corruption vulnerability in Nsasoft Nsauditor NetShareWatcher, published on 11 Feb 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2020-37200 exists.

Affected product: Nsasoft Nsauditor NetShareWatcher. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2020-37200/ (Markdown: https://insights.sbomify.com/CVE-2020-37200/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-37200
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-37200
- OSV: https://osv.dev/vulnerability/CVE-2020-37200

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-37200/
Summaries are generated and may contain mistakes; the official description above is the record.