CVE-2023-21708Network attack vector

Unauthenticated remote code execution

Published Mar 14, 2023 · Updated Jan 1, 2025

Remote code execution in Microsoft Windows RPC Runtime allows remote attackers to execute code via unspecified network vectors. Microsoft has not disclosed the affected function or how the published integer underflow arises while RPC Runtime processes untrusted input. No credentials or user interaction are required, and successful exploitation runs attacker-controlled code on the affected system.

CVSS severity9.8
Critical
EPSS probability1.49%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Remote code execution in Microsoft Windows RPC Runtime allows remote attackers to execute code via unspecified network vectors. Microsoft has not disclosed the affected function or how the published integer underflow arises while RPC Runtime processes untrusted input. No credentials or user interaction are required, and successful exploitation runs attacker-controlled code on the affected system.

The record

CVE
CVE-2023-21708
Published
Mar 14, 2023
Updated
Jan 1, 2025
Vendor
Microsoft
Product
Windows 10 Version 1507
Classifications
CWE-191, T1210
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 14, 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 <10.0.10240.19805

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft · Windows 10 Version 1507version=10.0.10240.0 <10.0.10240.19805
Microsoft · Windows Server 2019version=10.0.17763.0 <10.0.17763.4131
Microsoft · Windows Server 2016 (Server Core installation)version=10.0.14393.0 <10.0.14393.5786
Microsoft · Windows 11 version 21H2version=10.0.0 <10.0.22000.1696
Microsoft · Windows Server 2012 (Server Core installation)version=6.2.9200.0 <6.2.9200.24168
Microsoft · Windows Server 2012version=6.2.9200.0 <6.2.9200.24168
Microsoft · Windows 10 Version 21H2version=10.0.19043.0 <10.0.19044.2728
Microsoft · Windows Server 2016version=10.0.14393.0 <10.0.14393.5786
Microsoft · Windows Server 2008 R2 Service Pack 1version=6.1.7601.0 <6.1.7601.26415
Microsoft · Windows 10 Version 20H2version=10.0.0 <10.0.19042.2728
Microsoft · Windows Server 2008 R2 Service Pack 1 (Server Core installation)version=6.1.7601.0 <6.1.7601.26415
Microsoft · Windows 10 Version 22H2version=10.0.19045.0 <10.0.19045.2728
Microsoft · Windows Server 2012 R2 (Server Core installation)version=6.3.9600.0 <6.3.9600.20865
Microsoft · Windows Server 2019 (Server Core installation)version=10.0.17763.0 <10.0.17763.4131
Microsoft · Windows 11, version 22H2version=10.0.22621.0 <10.0.22621.1413
Microsoft · Windows 10 Version 1607version=10.0.14393.0 <10.0.14393.5786
Microsoft · Windows Server 2008 Service Pack 2version=6.0.6003.0 <6.0.6003.21966
Microsoft · Windows Server 2022version=10.0.20348.0 <10.0.20348.1607
Microsoft · Windows 10 Version 1809version=10.0.0 <10.0.17763.4131; version=10.0.17763.0 <10.0.17763.4131
Microsoft · Windows Server 2012 R2version=6.3.9600.0 <6.3.9600.20865
Microsoft · Windows Server 2008 Service Pack 2 (Server Core installation)version=6.0.6003.0 <6.0.6003.21966

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 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

CWE-191Integer Underflow (Wrap or Wraparound)
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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