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.NET
.NET NuGet
Not in CISA KEV
HIGH severity

CVE-2022-21167 — Masuit.Tools.Core

HIGH

CVE-2022-21167 is a high-severity (CVSS 7.5) remote code execution vulnerability in Masuit.Tools.Core. The records list no fixed version yet; check the vendor advisory below and apply the mitigations in the meantime.

Code Injection in Masuit.Tools.Core

Published
Updated
Affected
1 pkg
Patched
See advisory
Exploits
None indexed
Exploitation data as of Nov 8, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.5%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs74th percentile — riskier than 74% of all scored CVEsHighest risk
0.41%0.92%1.44%1.95%0.9%1.5%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
.NETMasuit.Tools.Core

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects NuGet packages — download data is not available via public APIs for these ecosystems.

Description

All versions of package Masuit.Tools.Core are vulnerable to Arbitrary Code Execution via the ReceiveVarData<T> function in the SocketClient.cs component. The socket client in the package can pass in the payload via the user-controllable input after it has been established, because this socket client transmission does not have the appropriate restrictions or type bindings for the BinaryFormatter.

Affected Packages

1 total
EcosystemPackageVulnerable rangeFix
.NETNuGetMasuit.Tools.Coreall versionsNo fix

Affected Products

1 product · 1 configurations
Application
masuit.toolsldqk
all

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for Masuit.Tools.Core, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Remediation status

    The records we use list no patched version of Masuit.Tools.Core for CVE-2022-21167. Check the maintainer's advisory, and where your build allows, override or pin the dependency away from the vulnerable range.

  3. Mitigate without a patch

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

All versions of package Masuit.Tools.Core are vulnerable to Arbitrary Code Execution via the ReceiveVarData<T> function in the SocketClient.cs component. The socket client in the package can pass in the payload via the user-controllable input after it has been established, because this socket client transmission does not have the appropriate restrictions or type bindings for the BinaryFormatter.
O3 Security · Impact-Aware SCA

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CVE-2022-21167: Masuit.Tools.Core: Code Injection