CVE-2022-34715Public exploitNetwork attack vector

Unauthenticated code execution via NFSv4 ACL handling

Published Aug 9, 2022 · Updated May 29, 2025

Code injection in Microsoft Windows Server 2022 before 10.0.20348.887 allows remote attackers to execute code via crafted NFSv4 ACL attributes. The nfssvr.sys Nfs4SrvAclBuildWindowsAclsFromNfsAcl routine passes a derived destination to memset while converting attacker-controlled ACL data. Exploitation requires Server for NFS to be enabled and reachable; the public packet capture demonstrates a kernel crash, while Microsoft identifies code execution as the impact.

CVSS severity9.8
Critical
EPSS probability80.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in Microsoft Windows Server 2022 before 10.0.20348.887 allows remote attackers to execute code via crafted NFSv4 ACL attributes. The nfssvr.sys Nfs4SrvAclBuildWindowsAclsFromNfsAcl routine passes a derived destination to memset while converting attacker-controlled ACL data. Exploitation requires Server for NFS to be enabled and reachable; the public packet capture demonstrates a kernel crash, while Microsoft identifies code execution as the impact.

The record

CVE
CVE-2022-34715
Published
Aug 9, 2022
Updated
May 29, 2025
Vendor
Microsoft
Product
Windows Server 2022
Classifications
CWE-94, T1210
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 9, 2022CVE publishedPublication date reported by the CVE source.
  2. May 29, 2025Record 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=10.0.20348.0 <10.0.20348.887

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft · Windows Server 2022version=10.0.20348.0 <10.0.20348.887

Published CVSS scores

9.8Microsoft CorporationCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1210Exploitation of Remote Services

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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