Summary
Impact: Denial of Service. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.
Details
According to the CVSS metrics, successful exploitation of this vulnerability could lead to major loss of availability (A:H). What does that mean for this vulnerability?
An attacker can send specially crafted packets which could affect availability of the service and result in Denial of Service (DoS).
Security updates
10.0.17763.9020 — https://support.microsoft.com/help/5099538
10.0.20348.5386 — https://support.microsoft.com/help/5099540
10.0.19044.7548 — https://support.microsoft.com/help/5099539
10.0.26100.33158 — https://support.microsoft.com/help/5099536
10.0.26200.8875 — https://support.microsoft.com/help/5101650
10.0.28000.2525 — https://support.microsoft.com/help/5101649
10.0.14393.9339 — https://support.microsoft.com/help/5099535
6.2.9200.26226 — https://support.microsoft.com/help/5099445
6.3.9600.23291 — https://support.microsoft.com/help/5099444
4.8.4803.0 — https://support.microsoft.com/help/5101007
4.8.4803.0 — https://support.microsoft.com/help/5101009
4.8.4803.0 — https://support.microsoft.com/help/5101011
2.0.50727.9069 & 3.0.30729.9067 & 4.8.4803.0 — https://support.microsoft.com/help/5101008
2.0.50727.9182 & 3.0.30729.9168 & 4.8.4803.0 — https://support.microsoft.com/help/5101010
2.0.50727.9182 & 3.0.30729.9168 & 4.8.4803.0 — https://support.microsoft.com/help/5101006
2.0.50727.9069 & 3.0.30729.9067 & 4.7.4143.0 — https://support.microsoft.com/help/5100989
4.7.4143.0 — https://support.microsoft.com/help/5100990
4.7.4143.0 — https://support.microsoft.com/help/5100991
2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0 — https://support.microsoft.com/help/5101005
2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0 — https://support.microsoft.com/help/5101000
2.0.50727.9182 & 3.0.30729.9168 & 4.8.9340.0 — https://support.microsoft.com/help/5100998
2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0 — https://support.microsoft.com/help/5101004
2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0 — https://support.microsoft.com/help/5101001
4.8.9340.0 — https://support.microsoft.com/help/5101002
Vulnerabilities 1
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High 7.5
Active Directory Federation Server Denial of Service Vulnerability
Loop with unreachable exit condition ('infinite loop') in Active Directory Federation Services (AD FS) allows an unauthorized attacker to deny service over a network.
Revision history
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#4
Updated product information in the Software Update table. This is an informational change only.
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#3
Updated product information in the Software Update table. This is an informational change only.
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#2
Updated product information in the Software Update table. This is an informational change only.
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#1
Information published.
References
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CVE-2026-50647 Active Directory Federation Server Denial of Service Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50647
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Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
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Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
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Common Vulnerability Scoring System
https://www.first.org/cvss