Windows Kerberos Information Disclosure Vulnerability
This medium-severity Microsoft Server advisory covers CVE-2026-20833 affecting Windows Server 2008 R2 Service Pack 1 (Server Core installation), Windows Server 2008 Service Pack 2 (Server Core installation), Windows Server 2012 (Server Core installation).
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Summary
Use of a broken or risky cryptographic algorithm in Windows Kerberos allows an authorized attacker to disclose information locally.
Affected products named by the advisory: Windows Server 2008 R2 Service Pack 1; Windows Server 2008 R2 Service Pack 1 (Server Core installation); Windows Server 2008 Service Pack 2; Windows Server 2008 Service Pack 2 (Server Core installation); and 12 more.
Affected products named by the advisory: Windows Server 2012 (Server Core installation); Windows Server 2012 R2 (Server Core installation); Windows Server 2016 (Server Core installation); Windows Server 2019 (Server Core installation); and 2 more.
- Windows Server 2008 R2 Service Pack 1 6.1.7601.0 before 6.1.7601.28117
- Windows Server 2008 R2 Service Pack 1 (Server Core installation) 6.1.7601.0 before 6.1.7601.28117
- Windows Server 2008 Service Pack 2 6.0.6003.0 before 6.0.6003.23717
- Windows Server 2008 Service Pack 2 (Server Core installation) 6.0.6003.0 before 6.0.6003.23717
- Windows Server 2012 6.2.9200.0 before 6.2.9200.25868
- Windows Server 2012 (Server Core installation) 6.2.9200.0 before 6.2.9200.25868
- Windows Server 2012 R2 6.3.9600.0 before 6.3.9600.22968
- Windows Server 2012 R2 (Server Core installation) 6.3.9600.0 before 6.3.9600.22968
- Windows Server 2016 10.0.14393.0 before 10.0.14393.8783
- Windows Server 2016 (Server Core installation) 10.0.14393.0 before 10.0.14393.8783
- Windows Server 2019 10.0.17763.0 before 10.0.17763.8276
- Windows Server 2019 (Server Core installation) 10.0.17763.0 before 10.0.17763.8276
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
- 6.1.7601.28117
- 6.0.6003.23717
- 6.2.9200.25868
- 6.3.9600.22968
- 10.0.14393.8783
- 10.0.17763.8276
- 10.0.20348.4648
- 10.0.25398.2092
- 10.0.26100.32230
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Mitigation
Upgrade to a fixed release: 6.1.7601.28117, 6.0.6003.23717, 6.2.9200.25868, 6.3.9600.22968, 10.0.14393.8783, 10.0.17763.8276. That is the remediation for this advisory.
The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Discussion(0)
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