Tuesday 9 September 2025

September 2025: is it safe to deploy?

What Microsoft fixed, how urgent it is, and whether anything broke, per Windows version, from Microsoft's release tables, release health, MSRC, CISA, and what the community reports.

← Aug 2025 Oct 2025 →

Evidence incomplete

September 2025: public evidence is incomplete.

The CVEs it fixes are unknown; no open known issues found in the current public evidence; out-of-band fixes followed on 22 Sep.

MSRC's September 2025 security update document isn't collected.

ChangeIntel's reading of public signals, not advice; check Microsoft's guidance and test before you deploy. Terms

Microsoft CVEs: Unknown
Exploited fixed: Unknown
In CISA KEV: Unknown
Open known issues: 0
Out-of-band: 1

Release calendar · April 2029

Sun 1 Apr

Mon 2 Apr

Tue 3 Apr

Wed 4 Apr

Thu 5 Apr

Fri 6 Apr

Sat 7 Apr

Sun 8 Apr

Mon 9 Apr

Tue 10 Apr

Patch Tuesday

Wed 11 Apr

Thu 12 Apr

Fri 13 Apr

Sat 14 Apr

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Mon 16 Apr

Tue 17 Apr

Wed 18 Apr

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Mon 23 Apr

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Sun 29 Apr

Mon 30 Apr

Patch Tuesday and security (B) releasesPreview (D) releasesOut-of-band releases.NET Framework servicing packagesEdge, Office, Teams, Defender and server releasesAll product versions