CVE-2020-17103

HIGH

Windows Cloud Files Mini Filter Driver - Privilege Escalation

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 8 public exploits for CVE-2020-17103. PoCs published by Nightmare-Eclipse, AlexLinov, 0xBlackash.

AI-analyzed exploit summary This repository contains a functional exploit for CVE-2020-17103, leveraging a race condition in Windows Cloud Experience Host to achieve local privilege escalation (LPE) via registry key manipulation and token impersonation.

Description

Windows Cloud Files Mini Filter Driver Elevation of Privilege Vulnerability

Exploits (8)

nomisec WORKING POC 38 stars
by Nightmare-Eclipse · poc
https://github.com/Nightmare-Eclipse/MiniPlasma

This repository contains a functional exploit for CVE-2020-17103, leveraging a race condition in Windows Cloud Experience Host to achieve local privilege escalation (LPE) via registry key manipulation and token impersonation.

Classification
Working Poc 95%
Attack Type
Lpe
Complexity
Complex
Reliability
Racy
Target: Windows 10 (specific versions affected by CVE-2020-17103)
No auth needed
Prerequisites: Local access to a vulnerable Windows system · Ability to execute arbitrary code as a low-privileged user
devstral-2 · analyzed May 19, 2026 Full analysis →
nomisec WORKING POC 2 stars
by AlexLinov · poc
https://github.com/AlexLinov/MiniPlasma-Runner

This repository contains a functional exploit for CVE-2020-17103, leveraging a Windows Error Reporting (WER) task to achieve local privilege escalation (LPE) by manipulating registry keys and executing a payload as SYSTEM. The exploit chain involves registry manipulation, token impersonation, and process creation.

Classification
Working Poc 95%
Attack Type
Lpe
Complexity
Complex
Reliability
Reliable
Target: Windows (specific versions affected by CVE-2020-17103)
Auth required
Prerequisites: Local access to a vulnerable Windows system · Ability to execute code as a non-privileged user
devstral-2 · analyzed May 21, 2026 Full analysis →
nomisec WORKING POC
by 0xBlackash · poc
https://github.com/0xBlackash/CVE-2020-17103

This repository contains a functional exploit for CVE-2020-17103, a local privilege escalation vulnerability in Windows Error Reporting (WER). The exploit leverages a race condition and registry manipulation to execute arbitrary code as SYSTEM by hijacking the WER task.

Classification
Working Poc 95%
Attack Type
Lpe
Complexity
Complex
Reliability
Racy
Target: Windows Error Reporting (WER) on Windows 10/Server 2019
Auth required
Prerequisites: Local access to a vulnerable Windows system · Ability to execute code as a low-privileged user
devstral-2 · analyzed Jun 08, 2026 Full analysis →
nomisec SUSPICIOUS
by rfranca777 · poc
https://github.com/rfranca777/miniplasma-advisory

The repository claims to provide a technical mitigation advisory for CVE-2020-17103 but only contains a README with a link to an external PDF download. No actual exploit code or technical details are provided.

Classification
Suspicious 90%
Attack Type
Other
Complexity
Theoretical
Reliability
Theoretical
Target: Windows Cloud Files Mini Filter Driver (cldflt.sys)
No auth needed
devstral-2 · analyzed Jun 04, 2026 Full analysis →
nomisec SCANNER
by arch1m3d · poc
https://github.com/arch1m3d/MiniPlasma-Detection

This repository contains a Sigma detection rule for identifying the exploitation of CVE-2020-17103, a Windows local privilege escalation vulnerability involving a race condition in cldflt.sys to hijack the windir environment variable. The rule detects registry writes to USER\.DEFAULT\Volatile Environment\windir, a key exploit primitive.

Classification
Scanner 100%
Attack Type
Lpe
Complexity
Moderate
Reliability
Reliable
Target: Windows 11 (fully patched as of May 2026)
Auth required
Prerequisites: Access to a Windows system with sufficient privileges to write to the registry · Sigma rule engine for detection
devstral-2 · analyzed May 19, 2026 Full analysis →
nomisec WORKING POC
by CaptainChicky · poc
https://github.com/CaptainChicky/MiniPlasma

This repository contains a functional exploit for CVE-2020-17103, leveraging a race condition in Windows Cloud Experience Host to achieve local privilege escalation (LPE) via registry key manipulation and symbolic link abuse.

Classification
Working Poc 95%
Attack Type
Lpe
Complexity
Complex
Reliability
Racy
Target: Windows 10 (Cloud Experience Host)
Auth required
Prerequisites: Local user access · Windows 10 with Cloud Experience Host enabled
devstral-2 · analyzed May 29, 2026 Full analysis →
nomisec WORKING POC
by mohammadzarnian1357 · poc
https://github.com/mohammadzarnian1357/MiniPlasma

This repository contains a functional exploit for CVE-2020-17103, leveraging the CfAbortOperation API to manipulate registry keys and achieve privilege escalation. The PoC demonstrates arbitrary registry key manipulation and symbolic link creation to escalate privileges.

Classification
Working Poc 95%
Attack Type
Lpe
Complexity
Moderate
Reliability
Reliable
Target: Windows Cloud Experience Host (cldapi.dll)
No auth needed
Prerequisites: Access to a vulnerable Windows system with Cloud Experience Host enabled
devstral-2 · analyzed May 25, 2026 Full analysis →
nomisec WORKING POC
by 0xDimas · poc
https://github.com/0xDimas/MiniPlasma

This repository contains a functional exploit for CVE-2020-17103, leveraging the CfAbortOperation API to manipulate registry keys and achieve privilege escalation. The PoC demonstrates arbitrary registry key manipulation and token impersonation to escalate privileges.

Classification
Working Poc 95%
Attack Type
Lpe
Complexity
Moderate
Reliability
Reliable
Target: Windows (specific versions affected by CVE-2020-17103)
No auth needed
Prerequisites: Access to a vulnerable Windows system · Ability to execute the compiled binary
devstral-2 · analyzed May 19, 2026 Full analysis →

Scores

CVSS v3 7.0
EPSS 0.0117
EPSS Percentile 79.2%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact total

Details

CWE
CWE-269
Status published
Products (37)
Microsoft/Windows 10 Version 1803 10.0.0 - publication
Microsoft/Windows 10 Version 1809 10.0.0 - publication
Microsoft/Windows 10 Version 1809 10.0.17763.0 - 10.0.17763.8880
Microsoft/Windows 10 Version 1809 10.0.17763.0 - publication
Microsoft/Windows 10 Version 1903 for 32-bit Systems 10.0.0 - publication
Microsoft/Windows 10 Version 1903 for ARM64-based Systems 10.0.0 - publication
Microsoft/Windows 10 Version 1903 for x64-based Systems 10.0.0 - publication
Microsoft/Windows 10 Version 1909 10.0.0 - publication
Microsoft/Windows 10 Version 2004 10.0.0 - publication
Microsoft/Windows 10 Version 20H2 10.0.0 - publication
... and 27 more
Published Dec 10, 2020
Tracked Since Feb 18, 2026