Tuesday 9 December 2025

December 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.

← Nov 2025 Jan 2026 →

Superseded

Newer updates replace December 2025.

The CVEs it fixes are unknown; no open known issues found in the current public evidence; out-of-band fixes followed on 18 Dec. See November 2026 Patch Tuesday.

MSRC's December 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: 3

Release calendar · February 2031

Sat 1 Feb

Sun 2 Feb

Mon 3 Feb

Tue 4 Feb

Wed 5 Feb

Thu 6 Feb

Fri 7 Feb

Sat 8 Feb

Sun 9 Feb

Mon 10 Feb

Tue 11 Feb

Patch Tuesday

Wed 12 Feb

Thu 13 Feb

Fri 14 Feb

Sat 15 Feb

Sun 16 Feb

Mon 17 Feb

Tue 18 Feb

Wed 19 Feb

Thu 20 Feb

Fri 21 Feb

Sat 22 Feb

Sun 23 Feb

Mon 24 Feb

Tue 25 Feb

Wed 26 Feb

Thu 27 Feb

Fri 28 Feb

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