[German]A short note for administrators who distribute updates for Microsoft Defender via WSUS or ConfigMgr (MECM ). There was probably a problem at Microsoft, so that the update distribution has stalled since May 2, 2025, although updates are available from Microsoft for the Defender. However, the issue has been fixed, updates should now be synced again.
A reader's message about Defender updates
A German blog reader asked in this comment on May 5, 2025 whether there were any problems with Defender updates or whether anyone was still receiving Microsoft Defender updates via WSUS/MECM. He had the last successful update on May 2, 2025.
As of this date, the reader does not receive any new Defender updates via WSUS/MECM. According to the blog reader, the log files only ever say "Skipped update … Update for Windows Defender Antivirus antimalware platform … because it is up to date".
The reader notes that the update still works on unmanaged clients and via Intune. The reader asks: "Has there been a change or is something broken at MS?"
Reports on reddit.com
I was unable to respond on May 5, 2025 for personal reasons. When I was researching late in the evening, I came across the recent post WSUS – No recent updates?? on reddit.com. The person concerned also noted that WSUS had stopped synchronizing Defender Definition updates since May 2, 2025.
Other users confirm the observation and note that definition updates have repeatedly not been delivered via WSUS in recent days. One notes that the last update he can see is the update for Microsoft Defender Antivirus version 1.427.596.0.
In a later addendum, however, the thread starter writes on May 5, 2025 that the WSUS is pulling definition updates for the Defender again. Can anyone confirm this?
There is also another recent thread on reddit.com SCCM stopped seeing Defender definition updates as of 3rd May 2025, which shares the same observation. There SCCM is no longer distributing Defender updates after May 3rd, 2025. This applies to 4 separate environments, writes the person concerned and asks: "Does anyone else have this problem?" The thread creator states not getting any errors in the logs. Only no new updates are displayed in SCCM under "All Software Updates". In a follow-up, the person concerned writes that he cannot see any new updates in the Microsoft Update Catalog either.
In this thread, too, people confirm the observation and write that both SCCM and WSUS are affected. One affected person was then able to obtain the updates via autopatch. Another affected person notes that a high-priority ticket has been opened with Microsoft since the weekend (May 3, 2025).
The latest updates can be downloaded from the Defender Updates page and installed manually.
Note from a reader on Facebook
Christian contacted me in a personal message on Facebook and informed me that since May 2, 2025 there has been a problem that Defender updates are no longer synced via WSUS / ConfigMgr. The background is probably that the update catalog currently does not provide newer packages although there are some. Thanks for the hints.
