CVE-2022-30136Network attack vector

SYSTEM code execution via NFSv4 response overflow

Published Jun 15, 2022 · Updated Jan 2, 2025

Buffer overflow in Windows NFS on Windows Server 2012 through 2019 allows remote attackers to execute code as SYSTEM via NFSv4.1 requests. Nfs4SvrXdrpGetEncodeOperationResultByteCount omits each opcode's four bytes when sizing a compound-response buffer, so 19 or more operations overflow the allocation. Server for NFS must be enabled with NFSv4.1; unsuccessful exploitation can crash the host rather than execute code.

CVSS severity9.8
Critical
EPSS probability73.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in Windows NFS on Windows Server 2012 through 2019 allows remote attackers to execute code as SYSTEM via NFSv4.1 requests. Nfs4SvrXdrpGetEncodeOperationResultByteCount omits each opcode's four bytes when sizing a compound-response buffer, so 19 or more operations overflow the allocation. Server for NFS must be enabled with NFSv4.1; unsuccessful exploitation can crash the host rather than execute code.

The record

CVE
CVE-2022-30136
Published
Jun 15, 2022
Updated
Jan 2, 2025
Vendor
Microsoft
Product
Windows Server 2019
Classifications
T1210
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 15, 2022CVE publishedPublication date reported by the CVE source.
  2. Jan 2, 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=10.0.17763.0 <10.0.17763.3046

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft · Windows Server 2019version=10.0.17763.0 <10.0.17763.3046
Microsoft · Windows Server 2016 (Server Core installation)version=10.0.14393.0 <10.0.14393.5192
Microsoft · Windows Server 2012 (Server Core installation)version=6.2.9200.0 <6.2.9200.23736
Microsoft · Windows Server 2012version=6.2.9200.0 <6.2.9200.23736
Microsoft · Windows Server 2016version=10.0.14393.0 <10.0.14393.5192
Microsoft · Windows Server 2012 R2 (Server Core installation)version=6.3.9600.0 <6.3.9600.20402
Microsoft · Windows Server 2019 (Server Core installation)version=10.0.17763.0 <10.0.17763.3046
Microsoft · Windows Server 2012 R2version=6.3.9600.0 <6.3.9600.20402

Published CVSS scores

9.8Microsoft CorporationCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
10.0NIST NVDAV:N/AC:L/Au:N/C:C/I:C/A:C

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1210Exploitation of Remote Services

Public exploit references

No public exploit references are available in this record.

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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