CVE-2021-36933Network attack vector

Unauthenticated network information disclosure

Published Aug 12, 2021 · Updated Aug 10, 2026

Information disclosure in Microsoft's Windows Services for NFS ONCRPC XDR driver allows remote attackers to read sensitive data over the network. Microsoft has not published the request field, parsing operation, or memory-handling error that causes the disclosure. Reachability requires Services for NFS and network access to the affected ONCRPC processing path.

CVSS severity7.5
High
EPSS probability3.47%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Information disclosure in Microsoft's Windows Services for NFS ONCRPC XDR driver allows remote attackers to read sensitive data over the network. Microsoft has not published the request field, parsing operation, or memory-handling error that causes the disclosure. Reachability requires Services for NFS and network access to the affected ONCRPC processing path.

The record

CVE
CVE-2021-36933
Published
Aug 12, 2021
Updated
Aug 10, 2026
Vendor
Microsoft
Product
Windows 10 Version 1507
Classifications
Unavailable
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 12, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.0.10240.0 <10.0.10240.19022

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft · Windows 10 Version 1507version=10.0.10240.0 <10.0.10240.19022
Microsoft · Windows Server 2019version=10.0.17763.0 <10.0.17763.2114
Microsoft · Windows 10 Version 21H1version=10.0.0 <10.0.19043.1165
Microsoft · Windows 10 Version 1909version=10.0.0 <10.0.18363.1734
Microsoft · Windows 8.1version=6.3.0 <6.3.9600.20094
Microsoft · Windows Server 2016 (Server Core installation)version=10.0.14393.0 <10.0.14393.4583
Microsoft · Windows Server 2012 (Server Core installation)version=6.2.9200.0 <6.2.9200.23435
Microsoft · Windows Server 2012version=6.2.9200.0 <6.2.9200.23435
Microsoft · Windows Server, version 2004version=10.0.0 <10.0.19041.1165
Microsoft · Windows Server 2016version=10.0.14393.0 <10.0.14393.4583
Microsoft · Windows 10 Version 20H2version=10.0.0 <10.0.19042.1165
Microsoft · Windows Server 2012 R2 (Server Core installation)version=6.3.9600.0 <6.3.9600.20094
Microsoft · Windows Server 2019 (Server Core installation)version=10.0.17763.0 <10.0.17763.2114
Microsoft · Windows Server version 20H2version=10.0.0 <10.0.19042.1165
Microsoft · Windows 10 Version 1607version=10.0.14393.0 <10.0.14393.4583
Microsoft · Windows 10 Version 2004version=10.0.0 <10.0.19041.1165
Microsoft · Windows 10 Version 1809version=10.0.0 <10.0.17763.2114; version=10.0.17763.0 <10.0.17763.2114
Microsoft · Windows Server 2012 R2version=6.3.9600.0 <6.3.9600.20094

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

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 exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo