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CVE

CVE-2021-40456

Windows AD FS Security Feature Bypass Vulnerability

Windows AD FS Security Feature Bypass Vulnerability.

MEDIUM · CVSS 5.3 EPSS 0.02256
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  • SSVC automatable: yes - attacks can be scripted at scale
Sigma rules0 YARA rules0
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Weakness Classification

CWE-863Incorrect Authorization
▤

Affected Products & Versions

3
microsoft windows serverall versions
microsoft windows server 2019all versions
microsoft windows server 2022all versions
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Scoring & Timeline

5.3
MEDIUM · CVSS v3.1 · secure@microsoft.com
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Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD13 Oct 2021 · 01:15 AM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
yes
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
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Vendor Advisories

1
msrcCVE-2021-40456Security Feature Bypass
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References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-40456PatchVendor Advisory
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