CVE-2026-21218
Analyzed
Analyzed - Analysis Complete
Spoofing Vulnerability in .NET Due to Missing Element Handling
Publication date: 2026-02-10
Last updated on: 2026-02-12
Assigner: Microsoft Corporation
Description
Description
Improper handling of missing special element in .NET allows an unauthorized attacker to perform spoofing over a network.
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| 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
KEV
| 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. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
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.
How can this vulnerability impact me? :
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.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
I don't know
How can this vulnerability be detected on my network or system? Can you suggest some commands?
I don't know
What immediate steps should I take to mitigate this vulnerability?
I don't know
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