Safe OS Dynamic Updates
Recovery environment updates, tracked separately from Windows cumulative and Setup Dynamic Updates.
SafeOS updates service the Windows recovery environment (WinRE) used during recovery and feature updates. They can include security fixes and reliability improvements. A catalog classification of Critical Updates is not a CVE severity rating.
Installation channels, prerequisites, replacement information and the need to update installation media vary by KB. Always check the Microsoft deployment guidance and the relevant support article. This listing does not assess whether a device's WinRE is patched.
Package history
714 packages · 262 KB articles · Last successful refresh: . Automatic discovery every 6 hours. Microsoft Update Catalog source
714 matching packages. Each row is a catalog package; the same KB can apply to multiple versions and architectures.
Release date and package build come from the KB article when available. Catalog revised is Microsoft's catalog revision date, not the original release date. Missing article details are explicitly marked and retried automatically.
| Product / version | Architecture | KB / details | Release date | Catalog revised | Package build | Catalog |
|---|---|---|---|---|---|---|
| Windows 10 21H2 | arm64 |
KB5007324
Details2021-11 Dynamic Update for Windows 10 Version 21H2 for ARM64-based Systems (KB5007324) Classification: Critical Updates. Size: 3.7 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2021-11-22 | Not available |
Package / download |
| Windows 10 21H2 | x64 |
KB5007324
Details2021-11 Dynamic Update for Windows 10 Version 21H2 for x64-based Systems (KB5007324) Classification: Critical Updates. Size: 2.2 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2021-11-22 | Not available |
Package / download |
| Windows 10 21H2 | x86 |
KB5007324
Details2021-11 Dynamic Update for Windows 10 Version 21H2 for x86-based Systems (KB5007324) Classification: Critical Updates. Size: 0.8 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2021-11-22 | Not available |
Package / download |
| Windows 11 | arm64 |
KB5007400
Details2021-11 Dynamic Update for Windows 11 for ARM64-based Systems (KB5007400) Classification: Critical Updates. Size: 2.0 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2021-11-22 | Not available |
Package / download |
| Windows 11 | x64 |
KB5007400
Details2021-11 Dynamic Update for Windows 11 for x64-based Systems (KB5007400) Classification: Critical Updates. Size: 1.5 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2021-11-22 | Not available |
Package / download |
| Windows 10 2004 | arm64 |
KB5006748
Details2021-10 Dynamic Update for Windows 10 Version 2004 for ARM64-based Systems (KB5006748) Classification: Critical Updates. Size: 3.6 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2021-10-26 | Not available |
Package / download |
| Windows 10 2004 | x64 |
KB5006748
Details2021-10 Dynamic Update for Windows 10 Version 2004 for x64-based Systems (KB5006748) Classification: Critical Updates. Size: 2.1 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2021-10-26 | Not available |
Package / download |
| Windows 10 2004 | x86 |
KB5006748
Details2021-10 Dynamic Update for Windows 10 Version 2004 for x86-based Systems (KB5006748) Classification: Critical Updates. Size: 0.8 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2021-10-26 | Not available |
Package / download |
| Windows 10 20H2 | arm64 |
KB5006748
Details2021-10 Dynamic Update for Windows 10 Version 20H2 for ARM64-based Systems (KB5006748) Classification: Critical Updates. Size: 3.6 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2021-10-26 | Not available |
Package / download |
| Windows 10 20H2 | x64 |
KB5006748
Details2021-10 Dynamic Update for Windows 10 Version 20H2 for x64-based Systems (KB5006748) Classification: Critical Updates. Size: 2.1 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2021-10-26 | Not available |
Package / download |
| Windows 10 20H2 | x86 |
KB5006748
Details2021-10 Dynamic Update for Windows 10 Version 20H2 for x86-based Systems (KB5006748) Classification: Critical Updates. Size: 0.8 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2021-10-26 | Not available |
Package / download |
| Windows 10 21H1 | arm64 |
KB5006748
Details2021-10 Dynamic Update for Windows 10 Version 21H1 for ARM64-based Systems (KB5006748) Classification: Critical Updates. Size: 3.6 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2021-10-26 | Not available |
Package / download |
| Windows 10 21H1 | x64 |
KB5006748
Details2021-10 Dynamic Update for Windows 10 Version 21H1 for x64-based Systems (KB5006748) Classification: Critical Updates. Size: 2.1 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2021-10-26 | Not available |
Package / download |
| Windows 10 21H1 | x86 |
KB5006748
Details2021-10 Dynamic Update for Windows 10 Version 21H1 for x86-based Systems (KB5006748) Classification: Critical Updates. Size: 0.8 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2021-10-26 | Not available |
Package / download |
| Windows 10 2004 | arm64 |
KB5005645
Details2021-09 Dynamic Update for Windows 10 Version 2004 for ARM64-based Systems (KB5005645) Classification: Critical Updates. Size: 3.6 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2021-09-30 | Not available |
Package / download |
| Windows 10 2004 | x64 |
KB5005645
Details2021-09 Dynamic Update for Windows 10 Version 2004 for x64-based Systems (KB5005645) Classification: Critical Updates. Size: 2.1 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2021-09-30 | Not available |
Package / download |
| Windows 10 2004 | x86 |
KB5005645
Details2021-09 Dynamic Update for Windows 10 Version 2004 for x86-based Systems (KB5005645) Classification: Critical Updates. Size: 0.8 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2021-09-30 | Not available |
Package / download |
| Windows 10 20H2 | arm64 |
KB5005645
Details2021-09 Dynamic Update for Windows 10 Version 20H2 for ARM64-based Systems (KB5005645) Classification: Critical Updates. Size: 3.6 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2021-09-30 | Not available |
Package / download |
| Windows 10 20H2 | x64 |
KB5005645
Details2021-09 Dynamic Update for Windows 10 Version 20H2 for x64-based Systems (KB5005645) Classification: Critical Updates. Size: 2.1 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2021-09-30 | Not available |
Package / download |
| Windows 10 20H2 | x86 |
KB5005645
Details2021-09 Dynamic Update for Windows 10 Version 20H2 for x86-based Systems (KB5005645) Classification: Critical Updates. Size: 0.8 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2021-09-30 | Not available |
Package / download |
| Windows 10 21H1 | arm64 |
KB5005645
Details2021-09 Dynamic Update for Windows 10 Version 21H1 for ARM64-based Systems (KB5005645) Classification: Critical Updates. Size: 3.6 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2021-09-30 | Not available |
Package / download |
| Windows 10 21H1 | x64 |
KB5005645
Details2021-09 Dynamic Update for Windows 10 Version 21H1 for x64-based Systems (KB5005645) Classification: Critical Updates. Size: 2.1 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2021-09-30 | Not available |
Package / download |
| Windows 10 21H1 | x86 |
KB5005645
Details2021-09 Dynamic Update for Windows 10 Version 21H1 for x86-based Systems (KB5005645) Classification: Critical Updates. Size: 0.8 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2021-09-30 | Not available |
Package / download |
| Windows 10 1909 | arm64 |
KB5003295
Details2021-05 Dynamic Update for Windows 10 Version 1909 for ARM64-based Systems (KB5003295) Classification: Critical Updates. Size: 6.8 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2021-05-11 | Not available |
Package / download |
| Windows 10 1909 | x64 |
KB5003295
Details2021-05 Dynamic Update for Windows 10 Version 1909 for x64-based Systems (KB5003295) Classification: Critical Updates. Size: 4.0 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2021-05-11 | Not available |
Package / download |
| Windows 10 1909 | x86 |
KB5003295
Details2021-05 Dynamic Update for Windows 10 Version 1909 for x86-based Systems (KB5003295) Classification: Critical Updates. Size: 1.7 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2021-05-11 | Not available |
Package / download |
| Windows 10 2004 | arm64 |
KB5000983
Details2021-03 Dynamic Update for Windows 10 Version 2004 for ARM64-based Systems (KB5000983) Classification: Critical Updates. Size: 3.5 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2021-03-29 | Not available |
Package / download |
| Windows 10 2004 | x64 |
KB5000983
Details2021-03 Dynamic Update for Windows 10 Version 2004 for x64-based Systems (KB5000983) Classification: Critical Updates. Size: 2.0 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2021-03-29 | Not available |
Package / download |
| Windows 10 2004 | x86 |
KB5000983
Details2021-03 Dynamic Update for Windows 10 Version 2004 for x86-based Systems (KB5000983) Classification: Critical Updates. Size: 0.7 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2021-03-29 | Not available |
Package / download |
| Windows 10 20H2 | arm64 |
KB5000983
Details2021-03 Dynamic Update for Windows 10 Version 20H2 for ARM64-based Systems (KB5000983) Classification: Critical Updates. Size: 3.5 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2021-03-29 | Not available |
Package / download |
| Windows 10 20H2 | x64 |
KB5000983
Details2021-03 Dynamic Update for Windows 10 Version 20H2 for x64-based Systems (KB5000983) Classification: Critical Updates. Size: 2.0 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2021-03-29 | Not available |
Package / download |
| Windows 10 20H2 | x86 |
KB5000983
Details2021-03 Dynamic Update for Windows 10 Version 20H2 for x86-based Systems (KB5000983) Classification: Critical Updates. Size: 0.7 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2021-03-29 | Not available |
Package / download |
| Windows 10 2004 | arm64 |
KB4586858
Details2020-11 Dynamic Update for Windows 10 Version 2004 for ARM64-based Systems (KB4586858) Classification: Critical Updates. Size: 2.3 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2020-11-10 | Not available |
Package / download |
| Windows 10 2004 | x64 |
KB4586858
Details2020-11 Dynamic Update for Windows 10 Version 2004 for x64-based Systems (KB4586858) Classification: Critical Updates. Size: 1.1 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2020-11-10 | Not available |
Package / download |
| Windows 10 2004 | x86 |
KB4586858
Details2020-11 Dynamic Update for Windows 10 Version 2004 for x86-based Systems (KB4586858) Classification: Critical Updates. Size: 0.5 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2020-11-10 | Not available |
Package / download |
| Windows 10 20H2 | arm64 |
KB4586858
Details2020-11 Dynamic Update for Windows 10 Version 20H2 for ARM64-based Systems (KB4586858) Classification: Critical Updates. Size: 2.3 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2020-11-10 | Not available |
Package / download |
| Windows 10 20H2 | x64 |
KB4586858
Details2020-11 Dynamic Update for Windows 10 Version 20H2 for x64-based Systems (KB4586858) Classification: Critical Updates. Size: 1.1 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2020-11-10 | Not available |
Package / download |
| Windows 10 20H2 | x86 |
KB4586858
Details2020-11 Dynamic Update for Windows 10 Version 20H2 for x86-based Systems (KB4586858) Classification: Critical Updates. Size: 0.5 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2020-11-10 | Not available |
Package / download |
| Windows 10 20H2 | arm64 |
KB4579305
Details2020-10 Dynamic Update for Windows 10 Version 20H2 for ARM64-based Systems (KB4579305) Classification: Critical Updates. Size: 1.9 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2020-10-20 | Not available |
Package / download |
| Windows 10 20H2 | x64 |
KB4579305
Details2020-10 Dynamic Update for Windows 10 Version 20H2 for x64-based Systems (KB4579305) Classification: Critical Updates. Size: 0.9 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2020-10-20 | Not available |
Package / download |
| Windows 10 20H2 | x86 |
KB4579305
Details2020-10 Dynamic Update for Windows 10 Version 20H2 for x86-based Systems (KB4579305) Classification: Critical Updates. Size: 0.4 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2020-10-20 | Not available |
Package / download |
| Windows 10 2004 | arm64 |
KB4579305
Details2020-09 Dynamic Update for Windows 10 Version 2004 for ARM64-based Systems (KB4579305) Classification: Critical Updates. Size: 1.9 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2020-09-08 | Not available |
Package / download |
| Windows 10 2004 | x64 |
KB4579305
Details2020-09 Dynamic Update for Windows 10 Version 2004 for x64-based Systems (KB4579305) Classification: Critical Updates. Size: 0.9 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2020-09-08 | Not available |
Package / download |
| Windows 10 2004 | x86 |
KB4579305
Details2020-09 Dynamic Update for Windows 10 Version 2004 for x86-based Systems (KB4579305) Classification: Critical Updates. Size: 0.4 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2020-09-08 | Not available |
Package / download |
| Windows 10 1809 | arm64 |
KB4506578
Details2019-08 Dynamic Update for Windows 10 Version 1809 for ARM64-based Systems (KB4506578) Classification: Critical Updates. Size: 0.6 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2019-08-22 | Not available |
Package / download |
| Windows 10 1809 | x64 |
KB4506578
Details2019-08 Dynamic Update for Windows 10 Version 1809 for x64-based Systems (KB4506578) Classification: Critical Updates. Size: 0.4 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2019-08-22 | Not available |
Package / download |
| Windows 10 1809 | x86 |
KB4506578
Details2019-08 Dynamic Update for Windows 10 Version 1809 for x86-based Systems (KB4506578) Classification: Critical Updates. Size: 0.3 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2019-08-22 | Not available |
Package / download |
| Windows 10 1803 | arm64 |
KB4230204
Details2018-06 Dynamic Update for Windows 10 Version 1803 for ARM64-based Systems (KB4230204) Classification: Critical Updates. Size: 2.0 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2019-04-23 | Not available |
Package / download |
| Windows 10 1803 | x64 |
KB4230204
Details2018-06 Dynamic Update for Windows 10 Version 1803 for x64-based Systems (KB4230204) Classification: Critical Updates. Size: 1.6 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2019-04-23 | Not available |
Package / download |
| Windows 10 1803 | x86 |
KB4230204
Details2018-06 Dynamic Update for Windows 10 Version 1803 for x86-based Systems (KB4230204) Classification: Critical Updates. Size: 1.3 MB. Support article details unavailable. Open the KB link for the authoritative information. |
Not available | 2019-04-23 | Not available |
Package / download |
Programmatic access: GET /api/WindowsVersions/safeos. See API access and authentication.