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
Improper handling of missing special element in .NET allows an unauthorized attacker to perform spoofing over a network.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published
2026-02-10
Last Modified
2026-02-12
Generated
2026-07-06
AI Q&A
2026-02-10
EPSS Evaluated
2026-07-05
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
CWE Icon
KEV
KEV Icon
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 Quick Actions

Instant insights powered by AI
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

I don't know

Detection Guidance

I don't know

Mitigation Strategies

I don't know

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-21218. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart