Tuesday 14 December 2021
December 2021: 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.
Evidence incomplete
December 2021: 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 4 Jan, 5 Jan.
MSRC's December 2021 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 · December 2021
Wed 1 Dec
Thu 2 Dec
Fri 3 Dec
Sat 4 Dec
Sun 5 Dec
Mon 6 Dec
Tue 7 Dec
Wed 8 Dec
Thu 9 Dec
Fri 10 Dec
Sat 11 Dec
Sun 12 Dec
Mon 13 Dec
Tue 14 Dec
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Fri 17 Dec
Sat 18 Dec
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Mon 20 Dec
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Sat 25 Dec
Sun 26 Dec
Mon 27 Dec
Tue 28 Dec
Wed 29 Dec
Thu 30 Dec
Fri 31 Dec
Patch Tuesday and security (B) releasesPreview (D) releasesOut-of-band releases.NET Framework servicing packagesEdge, Office, Teams, Defender and server releasesAll product versions