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Known update issues

KB5073381 – known issues and fixes

There is no data from the Microsoft Security Update Guide for KB5073381 – for example for an optional preview update or an update from another vendor. Affected according to our entries: Microsoft Windows Server. Known issues with this update: 1 dated change.

0Open
0Workaround
0Fixed
1Dated change

← All known issues

Known issues with KB5073381

In effectDated change

Windows Server: Kerberos KDC defaults to AES, RC4 service tickets blocked (CVE-2026-20833)

Microsoft is hardening the Kerberos Key Distribution Center (KDC) on domain controllers against CVE-2026-20833, an information disclosure flaw that lets attackers obtain RC4-encrypted service tickets for offline password attacks. Since the updates of 14 April 2026, the default for accounts without an explicit encryption setting is AES-SHA1 only. Updates from July 2026 remove the rollback option. Status as of 2026-11-01: the change is live.

Microsoft · Windows Server

Where the information comes from

We continuously read the vendors’ official sources, community reports and trade media and summarise them in our own words, with a link to the source:

  • Microsoft: Windows release health (Windows 10/11, Server 2016 to 2025), Windows message center, known issues of Microsoft 365 Apps (Outlook, Excel, Word, PowerPoint), Edge, Intune, Autopilot, Windows 365 and Entra Connect, Microsoft KB articles with timelines, Exchange and Windows IT Pro blogs, optionally Microsoft 365 service health and message center
  • other vendors: Veeam KB, Citrix (known issues), Ubuntu and Debian (regressions), Broadcom (VMware), Fortinet, Cisco, Mozilla, Let’s Encrypt
  • community (title, short excerpt and link only, without the names of the authors): Microsoft Q&A, Microsoft Tech Community (discussions), Veeam R&D Forums, Eleven Forum
  • targeted web research with AI (Claude), e.g. on the updates of the month – this also finds discussions on Reddit and in forums; such entries are labelled as community reports until the vendor confirms them
  • early warning from trade media (title and link only): Born’s Tech and Windows World, BleepingComputer, AskWoody, Windows Latest, Windows Central, gHacks, The Windows Club, Deskmodder, Dr. Windows, WindowsArea, Frankys Web, heise online

Summary and translation with AI (Claude by Anthropic) – without any data of visitors.

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