CVE-2023-33166Network attack vector

Service interruption via RPC buffer over-read

Published Jul 11, 2023 · Updated Jan 1, 2025

Buffer over-read in Microsoft Windows RPC Runtime allows remote authenticated users to interrupt RPC services with crafted network traffic. Microsoft identifies the weakness as a buffer over-read but has not published the affected function, protocol field, or precise invalid read. Network reachability to an RPC service and low privileges are required; exploitation affects availability without reported data disclosure or modification.

CVSS severity6.5
Medium
EPSS probability1.63%
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

Buffer over-read in Microsoft Windows RPC Runtime allows remote authenticated users to interrupt RPC services with crafted network traffic. Microsoft identifies the weakness as a buffer over-read but has not published the affected function, protocol field, or precise invalid read. Network reachability to an RPC service and low privileges are required; exploitation affects availability without reported data disclosure or modification.

The record

CVE
CVE-2023-33166
Published
Jul 11, 2023
Updated
Jan 1, 2025
Vendor
Microsoft
Product
Windows 10 Version 1507
Classifications
CWE-126, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 11, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 1, 2025Record 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 <10.0.10240.20048

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Microsoft · Windows 10 Version 1507version=10.0.10240.0 <10.0.10240.20048
Microsoft · Windows Server 2019version=10.0.17763.0 <10.0.17763.4645
Microsoft · Windows Server 2016 (Server Core installation)version=10.0.14393.0 <10.0.14393.6085
Microsoft · Windows 11 version 21H2version=10.0.0 <10.0.22000.2176
Microsoft · Windows Server 2012 (Server Core installation)version=6.2.9200.0 <6.2.9200.24374
Microsoft · Windows Server 2012version=6.2.9200.0 <6.2.9200.24374
Microsoft · Windows 10 Version 21H2version=10.0.19043.0 <10.0.19044.3208
Microsoft · Windows Server 2016version=10.0.14393.0 <10.0.14393.6085
Microsoft · Windows Server 2008 R2 Service Pack 1version=6.1.7601.0 <6.1.7601.26623
Microsoft · Windows Server 2008 R2 Service Pack 1 (Server Core installation)version=6.1.7601.0 <6.1.7601.26623
Microsoft · Windows 10 Version 22H2version=10.0.19045.0 <10.0.19045.3208
Microsoft · Windows Server 2012 R2 (Server Core installation)version=6.3.9600.0 <6.3.9600.21063
Microsoft · Windows Server 2019 (Server Core installation)version=10.0.17763.0 <10.0.17763.4645
Microsoft · Windows 11, version 22H2version=10.0.22621.0 <10.0.22621.1992
Microsoft · Windows 10 Version 1607version=10.0.14393.0 <10.0.14393.6085
Microsoft · Windows Server 2008 Service Pack 2version=6.0.6003.0 <6.0.6003.22175
Microsoft · Windows Server 2022version=10.0.20348.0 <10.0.20348.1850
Microsoft · Windows 10 Version 1809version=10.0.0 <10.0.17763.4645; version=10.0.17763.0 <10.0.17763.4645
Microsoft · Windows Server 2012 R2version=6.3.9600.0 <6.3.9600.21063
Microsoft · Windows Server 2008 Service Pack 2 (Server Core installation)version=6.0.6003.0 <6.0.6003.22175

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
6.5Microsoft CorporationCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-126Buffer Over-read
T1499Endpoint Denial of Service

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