CVE-2026-20833

Windows Kerberos Information Disclosure Vulnerability

CVE-2026-20833 is fixed in 19 products on 1 platform, first by KB5073722, released January 13, 2026. It is not reported as exploited. Patch Radar priority: Routine.

Routine

CVSS

5.5

Important

Exploitation

None reported

Exploitation Less Likely

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0053

45th percentile

<p>Use of a broken or risky cryptographic algorithm in Windows Kerberos allows an authorized attacker to disclose information locally.</p>

Where it's fixed

Product	Fixed in	Fix	Released
Microsoft
Windows Server 2008 R2 for x64-based Systems Service Pack 1		KB5073699	Jan 13, 2026
Windows Server 2008 R2 for x64-based Systems Service Pack 1		KB5073695	Jan 13, 2026
Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)		KB5073699	Jan 13, 2026
Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)		KB5073695	Jan 13, 2026
Windows Server 2008 for 32-bit Systems Service Pack 2		KB5073700	Jan 13, 2026
Windows Server 2008 for 32-bit Systems Service Pack 2		KB5073697	Jan 13, 2026
Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation)		KB5073700	Jan 13, 2026
Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation)		KB5073697	Jan 13, 2026
Windows Server 2008 for x64-based Systems Service Pack 2		KB5073700	Jan 13, 2026
Windows Server 2008 for x64-based Systems Service Pack 2		KB5073697	Jan 13, 2026
Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation)		KB5073700	Jan 13, 2026
Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation)		KB5073697	Jan 13, 2026
Windows Server 2012		KB5073698	Jan 13, 2026
Windows Server 2012 (Server Core installation)		KB5073698	Jan 13, 2026
Windows Server 2012 R2		KB5073696	Jan 13, 2026
Windows Server 2012 R2 (Server Core installation)		KB5073696	Jan 13, 2026
Windows Server 2016	14393.8783	KB5073722	Jan 13, 2026
Windows Server 2016 (Server Core installation)	14393.8783	KB5073722	Jan 13, 2026
Windows Server 2019	17763.8276	KB5073723	Jan 13, 2026
Windows Server 2019 (Server Core installation)	17763.8276	KB5073723	Jan 13, 2026
Windows Server 2022	20348.4648	KB5073457	Jan 13, 2026
Windows Server 2022 (Server Core installation)	20348.4648	KB5073457	Jan 13, 2026
Windows Server 2022, 23H2 Edition (Server Core installation)	25398.2092	KB5073450	Jan 13, 2026
Windows Server 2025	26100.32230	KB5073379	Jan 13, 2026
Windows Server 2025 (Server Core installation)	26100.32230	KB5073379	Jan 13, 2026

Details

Published
January 13, 2026
Weakness
Use of a Broken or Risky Cryptographic Algorithm
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20833

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