CVE-2026-21218
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Spoofing Vulnerability in .NET Due to Missing Element Handling

Publication date: 2026-02-10

Last updated on: 2026-02-12

Assigner: Microsoft Corporation

Description
Improper handling of missing special element in .NET allows an unauthorized attacker to perform spoofing over a network.
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Meta Information
Published
2026-02-10
Last Modified
2026-02-12
Generated
2026-06-16
AI Q&A
2026-02-10
EPSS Evaluated
2026-06-15
NVD
CVE-2026-21218
Affected Vendors & Products
Showing 3 associated CPEs
Vendor Product Version / Range
microsoft .net From 10.0.0 (inc) to 10.0.3 (exc)
microsoft .net From 8.0.0 (inc) to 8.0.24 (exc)
microsoft .net From 9.0.0 (inc) to 9.0.13 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-166 The product receives input from an upstream component, but it does not handle or incorrectly handles when an expected special element is missing.
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Executive Summary

This vulnerability involves improper handling of a missing special element in the .NET framework. It allows an unauthorized attacker to perform spoofing attacks over a network.

Impact Analysis

The vulnerability can impact you by enabling an attacker to spoof network communications, potentially impersonating trusted entities. This can lead to unauthorized actions or misinformation being accepted as legitimate.

Compliance Impact

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Detection Guidance

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