Description
Improper handling of missing special element in .NET allows an unauthorized attacker to perform spoofing over a network.
Published: 2026-02-10
Score: 7.5 High
EPSS: < 1% Very Low
KEV: No
Impact: Spoofing over network causing unauthorized identity forgery
Action: Assess Impact
AI Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

Remediation

No vendor fix or workaround currently provided.

Additional remediation guidance may be available on OpenCVE Cloud.

Tracking

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-qvhc-9v3j-5rfw Microsoft Security Advisory CVE-2026-21218 | .NET Security Feature Bypass Vulnerability
History

Thu, 12 Feb 2026 17:45:00 +0000

Type Values Removed Values Added
First Time appeared Apple
Apple macos
Linux
Linux linux Kernel
Microsoft windows
CPEs cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*
Vendors & Products Apple
Apple macos
Linux
Linux linux Kernel
Microsoft windows

Wed, 11 Feb 2026 16:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 10 Feb 2026 18:15:00 +0000

Type Values Removed Values Added
Description Improper handling of missing special element in .NET allows an unauthorized attacker to perform spoofing over a network.
Title .NET Spoofing Vulnerability
First Time appeared Microsoft
Microsoft .net
Weaknesses CWE-166
CPEs cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*
Vendors & Products Microsoft
Microsoft .net
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C'}


cve-icon MITRE

Status: PUBLISHED

Assigner: microsoft

Published:

Updated: 2026-05-11T21:25:22.663Z

Reserved: 2025-12-11T21:02:05.731Z

Link: CVE-2026-21218

cve-icon Vulnrichment

Updated: 2026-02-11T15:29:15.295Z

cve-icon NVD

Status : Analyzed

Published: 2026-02-10T18:16:22.967

Modified: 2026-02-12T17:35:25.617

Link: CVE-2026-21218

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-04-15T17:45:10Z

Weaknesses