Instituto Nacional de ciberseguridad. Sección Incibe
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CVE-2026-21218

Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
10/02/2026
Last modified:
12/02/2026

Description

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

Impact

Vector 3.x
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N CVSS v3.1 Severity and Metrics:

Base Score: 7.50 HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): High
Availability (A): None

Base Score 3.x
7.50
Severity 3.x
HIGH

Vulnerable products and versions

CPE From Up to
cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:* 8.0.0 (including) 8.0.24 (excluding)
cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:* 9.0.0 (including) 9.0.13 (excluding)
cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:* 10.0.0 (including) 10.0.3 (excluding)
cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools