.NET Spoofing Vulnerability (Microsoft .NET 10.0)
At a glance
- Source
- NVD
- EPSS
- EPSS 1.01 % · percentile 63 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- microsoft
- NVD status
- Analyzed
Description
Improper handling of missing special element in .NET allows an unauthorized attacker to perform spoofing over a network.
Weaknesses (CWE)
- CWE-166 — Improper Handling of Missing Special Element
References
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | HIGH 7.5 | 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 | microsoft |
| CVSS 3.1 | HIGH 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N | NVD · secure@microsoft.com (Secondary) |
Advisories
- GHSA-qvhc-9v3j-5rfw — Microsoft Security Advisory CVE-2026-21218 | .NET Security Feature Bypass Vulnerability
European references
- ENISA EUVD · EUVD-2026-7347
- GCVE · GCVE-0-2026-21218
CERT-FR advisories
- CERTFR-2026-AVI-0796 — Multiples vulnérabilités dans Tenable Identity Exposure · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0436 — Multiples vulnérabilités dans Tenable Identity Exposure · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0151 — Vulnérabilité dans Microsoft .Net · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0150 — Multiples vulnérabilités dans Microsoft Windows · cert.ssi.gouv.fr
Affected configurations (NVD CPE)
cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*≥ 8.0.0 < 8.0.24cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*≥ 9.0.0 < 9.0.13cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*≥ 10.0.0 < 10.0.3
Affected products
| Product | Versions |
|---|---|
| Microsoft · .NET 10.0 | affected 10.0.0 < 10.0.3 |
| Microsoft · .NET 8.0 | affected 8.0.0 < 8.0.24 |
| Microsoft · .NET 9.0 | affected 9.0.0 < 9.0.13 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |