# CVE-2022-26937: Windows Network File System Remote Code Execution Vulnerability

> Attackers can execute arbitrary code on Windows Server systems via the Network File System component.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 10 May 2022
- **Updated:** 2 Jan 2025
- **Also known as:** GHSA-982c-jgv5-r7gp

## What is CVE-2022-26937?

CVE-2022-26937 is a critical code injection vulnerability in Microsoft Windows Server, published on 10 May 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Windows Network File System Remote Code Execution Vulnerability

## Which versions are affected by CVE-2022-26937?

It affects 6 products.


Products: Microsoft Windows Server, Microsoft Windows Server 2008, Microsoft Windows Server 2012, Microsoft Windows Server 2016, Microsoft Windows Server 2019, Microsoft Windows Server 2022.

## How do I fix CVE-2022-26937?

No fix has been published for CVE-2022-26937 yet. Limit exposure of the affected software until one is available.

## Is CVE-2022-26937 being exploited?

There is no known exploitation of CVE-2022-26937 in the wild and no public exploit code.

Public exploit code:

- Windows Network File System Crash PoC (github_poc): https://github.com/omair2084/CVE-2022-26937
- POC Of CVE-2022-26937 (github_poc): https://github.com/Malwareman007/CVE-2022-26937
- A Zeek package to detect CVE-2022-26937, a vulnerability in the Network Lock Manager (NLM) protocol in Windows NFS server. (github_poc): https://github.com/corelight/CVE-2022-26937

## Other vulnerabilities in Microsoft Windows Server

- [CVE-2022-26932](https://insights.sbomify.com/CVE-2022-26932/): Storage Spaces Direct Elevation of Privilege Vulnerability (high 8.2)
- [CVE-2022-21884](https://insights.sbomify.com/CVE-2022-21884/): Local Security Authority Subsystem Service Elevation of Privilege Vulnerability (high 7.8)
- [CVE-2022-21910](https://insights.sbomify.com/CVE-2022-21910/): Microsoft Cluster Port Driver Elevation of Privilege Vulnerability (high 7.8)
- [CVE-2021-42282](https://insights.sbomify.com/CVE-2021-42282/): Active Directory Domain Services Elevation of Privilege Vulnerability (high 7.5)
- [CVE-2021-42291](https://insights.sbomify.com/CVE-2021-42291/): Active Directory Domain Services Elevation of Privilege Vulnerability (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-26937 and fix it if it is affected.

What it is: CVE-2022-26937 is a critical code injection vulnerability in Microsoft Windows Server, published on 10 May 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2022-26937 in the wild and no public exploit code.

Affected product: Microsoft Windows Server. 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-2022-26937/ (Markdown: https://insights.sbomify.com/CVE-2022-26937/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-26937
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-26937
- OSV: https://osv.dev/vulnerability/CVE-2022-26937

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-26937/
Summaries are generated and may contain mistakes; the official description above is the record.