CVE-2023-24905

User-assisted code execution via resource DLL hijacking

Published May 9, 2023 · Updated Jul 10, 2025

Remote code execution in Microsoft Windows Remote Desktop Client allows attackers to run code when a user opens a crafted RDP file. On Windows on ARM, mstsc.exe loads fxsresm.dll from the RDP file's directory as a resource, then processes attacker-controlled format strings as printf-style data. A user must open the file; Microsoft lists x86, x64, and ARM64 releases as affected, although the disclosed reproduction succeeded only on ARM.

CVSS severity7.8
High
EPSS probability0.67%
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 Remote Desktop Client allows attackers to run code when a user opens a crafted RDP file. On Windows on ARM, mstsc.exe loads fxsresm.dll from the RDP file's directory as a resource, then processes attacker-controlled format strings as printf-style data. A user must open the file; Microsoft lists x86, x64, and ARM64 releases as affected, although the disclosed reproduction succeeded only on ARM.

The record

CVE
CVE-2023-24905
Published
May 9, 2023
Updated
Jul 10, 2025
Vendor
Microsoft
Product
Windows 11 version 21H2
Classifications
CWE-284, T1574.001, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 9, 2023CVE publishedPublication date reported by the CVE source.
  2. Jul 10, 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=10.0.0 <10.0.22000.1936

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Microsoft · Windows 11 version 21H2version=10.0.0 <10.0.22000.1936
Microsoft · Windows 10 Version 21H2version=10.0.19043.0 <10.0.19044.2965
Microsoft · Windows 10 Version 20H2version=10.0.0 <10.0.19042.2965
Microsoft · Windows 10 Version 22H2version=10.0.19045.0 <10.0.19045.2965
Microsoft · Windows 11, version 22H2version=10.0.22621.0 <10.0.22621.1702

Published CVSS scores

6.8MicrosoftCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
7.8MicrosoftCVSS:3.1/AV:L/AC:L/PR:N/UI:R/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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-284Improper Access Control
T1574.001Hijack Execution Flow: DLL
T1204.002User Execution: Malicious File

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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