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Windows Active Directory Federation Services Denial of Service Vulnerability Affected products named by the advisory: Windows Server 2019; Windows Server 2022; Windows Server 2025; Windows Server 2016; and 2 more. Affected products named by the advisory: Windows Server 2012 R2.
What this means
In plain English
Windows Active Directory Federation Services Denial of Service Vulnerability Affected products named by the advisory: Windows Server 2019; Windows Server 2022; Windows Server 2025; Windows Server 2016; and 2 more. Affected products named by the advisory: Windows Server 2012 R2.
Recommended action
Upgrade to a vendor-listed fixed release: KB5099538 (build 10.0.17763.9020), KB5099540 (build 10.0.20348.5386), KB5099536 (build 10.0.26100.33158), KB5099535 (build 10.0.14393.9339), KB5099445 (build 6.2.9200.26226), KB5099444 (build 6.3.9600.23291). Vendor-listed mitigations/workarounds: Install the applicable security update for your platform: KB5099538, KB5099540, KB5099536, KB5099535, KB5099445, KB5099444 (see the Microsoft Update Catalog).
Generated from the parsed advisory data above. The vendor advisory is authoritative.
Discussion(0)
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No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 3 hours ago·verify at source
Fixed versions
KB5099538 (build 10.0.17763.9020)
KB5099540 (build 10.0.20348.5386)
KB5099536 (build 10.0.26100.33158)
KB5099535 (build 10.0.14393.9339)
KB5099445 (build 6.2.9200.26226)
KB5099444 (build 6.3.9600.23291)
Official advisory · high-confidence parse· fetched 3 hours ago·verify at source
Mitigation checklist
Recommended fix / mitigation
Install the applicable security update for your platform: KB5099538, KB5099540, KB5099536, KB5099535, KB5099445, KB5099444 (see the Microsoft Update Catalog).
Official advisory · high-confidence parse· fetched 3 hours ago·verify at source
Official documentation
Direct download of the KB5099540 security update named in the MSRC remediation data for this CVE.