What’s Vulnerable › Vulnerabilities

CVE-2022-32230: SMBv3 FileNormalizedNameInformation NULL Pointer Dereference

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 7.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2022-06-14 · updated 2026-06-17
• Weakness: CWE-476

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.

Affected products

• Microsoft Windows 10 Version 1607: 20h2, 21h1, 21h2, 1809
• Microsoft Windows 11 version 21H2: all versions
• Microsoft Windows Server 2019: all versions
• Microsoft Windows 10 20H2: from 19042.1706 before 19042.1706; from 19043.1706 before 19043.1706; from 19044.1706 before 19043.1706 — fixed in 19042.1706, 19043.1706
• Microsoft Windows 10 21H1: from 19042.1706 before 19042.1706; from 19043.1706 before 19043.1706; from 19044.1706 before 19044.1706 — fixed in 19042.1706, 19043.1706, 19044.1706
• Microsoft Windows 10: from 19042.1706 before 19042.1706; from 19043.1706 before 19043.1706; from 19044.1706 before 19044.1706 — fixed in 19042.1706, 19043.1706, 19044.1706
• Microsoft Windows Server version 20H2: from 19042.1706 before 19042.1706; from 19043.1706 before 19043.1706; from 19044.1706 before 19044.1706 — fixed in 19042.1706, 19043.1706, 19044.1706

How to fix

Upgrade to a fixed version: Microsoft Windows 10 20H2 19042.1706, 19043.1706; Microsoft Windows 10 21H1 19042.1706, 19043.1706, 19044.1706; Microsoft Windows 10 19042.1706, 19043.1706, 19044.1706; Microsoft Windows Server version 20H2 19042.1706, 19043.1706, 19044.1706. Check the vendor advisory for mitigations.

References

• https://github.com/zeroSteiner/metasploit-framework/blob/feat/mod/cve-2022-32230/modules/auxiliary/dos/smb/smb_filenormalizednameinformation.rb
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2022-32230
• 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
• https://www.rapid7.com/blog/post/2022/06/14/cve-2022-32230-windows-smb-denial-of-service-vulnerability-fixed/
• https://github.com/zeroSteiner/metasploit-framework/blob/feat/mod/cve-2022-32230/modules/auxiliary/dos/smb/smb_filenormalizednameinformation.rb
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2022-32230
• 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
• https://www.rapid7.com/blog/post/2022/06/14/cve-2022-32230-windows-smb-denial-of-service-vulnerability-fixed/

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