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 · October 2027

Fri 1 Oct

Sat 2 Oct

Sun 3 Oct

Mon 4 Oct

Tue 5 Oct

Wed 6 Oct

Thu 7 Oct

Fri 8 Oct

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Mon 11 Oct

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Patch Tuesday

Wed 13 Oct

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Sun 31 Oct

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