CVE-2021-26871

HIGH

Windows WalletService - Privilege Escalation

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 2 public exploits for CVE-2021-26871. PoCs published by fr4nkxixi.

AI-analyzed exploit summary This repository contains a proof-of-concept exploit for CVE-2021-26871, which involves a 'PROPVARIANT' type confusion vulnerability in the WalletService component. The PoC demonstrates a crash in the `HandleBarcodePropertyValue` function, likely leading to a denial-of-service (DoS) or potential remote code execution (RCE) condition.

Description

Windows WalletService Elevation of Privilege Vulnerability

Exploits (2)

nomisec WORKING POC 3 stars
by fr4nkxixi · poc
https://github.com/fr4nkxixi/CVE-2021-26871_POC

This repository contains a proof-of-concept exploit for CVE-2021-26871, which involves a 'PROPVARIANT' type confusion vulnerability in the WalletService component. The PoC demonstrates a crash in the `HandleBarcodePropertyValue` function, likely leading to a denial-of-service (DoS) or potential remote code execution (RCE) condition.

Classification
Working Poc 90%
Attack Type
Dos | Rce
Complexity
Moderate
Reliability
Reliable
Target: Microsoft Windows WalletService
No auth needed
Prerequisites: Access to the WalletService component on a vulnerable Windows system
devstral-2 · analyzed Feb 16, 2026 Full analysis →
inthewild WORKING POC
poc
https://github.com/robotmd5/cve-2021-26871_poc

The repository contains a functional proof-of-concept exploit for CVE-2021-26871, demonstrating a 'PROPVARIANT' type confusion vulnerability in the Windows WalletService. The provided C code triggers an access violation in the 'HandleBarcodePropertyValue' function, showcasing the vulnerability's exploitability.

Classification
Working Poc 90%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: Windows WalletService
No auth needed
Prerequisites: Access to the target system running Windows WalletService
devstral-2 · analyzed Feb 23, 2026 Full analysis →

References (1)

Core 1
Core References

Scores

CVSS v3 7.8
EPSS 0.0143
EPSS Percentile 81.1%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Details

Status published
Products (7)
microsoft/windows_10
microsoft/windows_10 20h2
microsoft/windows_10 1607
microsoft/windows_10 1803
microsoft/windows_10 1809
microsoft/windows_10 1909
microsoft/windows_10 2004
Published Mar 11, 2021
Tracked Since Feb 18, 2026