KB5050021

Microsoft security update released 2025-01-14. Fixes 121 CVEs.

CriticalCISA KEV

Download KB5050021

Get the official update for KB5050021. The download and file size for each supported product are on the Microsoft Update Catalog page.

Microsoft Update Catalog: download KB5050021 Microsoft support article

Update summary

Released

2025-01-14

CVEs fixed

121

Max CVSS

9.8

Severity

Critical

Exploitation and severity

Fixes 121 CVEs. At least one is actively exploited (CISA KEV). Most severe CVSS 9.8 (Critical). EPSS exploit probability up to 81%.

Among the top 10% of tracked Microsoft updates by EPSS exploit probability.

What to do

Treat as urgent: it is being exploited in the wild (CISA KEV), so patch ahead of items that are not. Senserva flags whether KB5050021 is missing on your devices.

CVEs fixed by this update

CVE-2024-7344 CVE-2025-21189 CVE-2025-21202 CVE-2025-21207 CVE-2025-21210 CVE-2025-21211 CVE-2025-21213 CVE-2025-21214 CVE-2025-21215 CVE-2025-21217 CVE-2025-21219 CVE-2025-21220 CVE-2025-21223 CVE-2025-21224 CVE-2025-21226 CVE-2025-21227 CVE-2025-21228 CVE-2025-21229 CVE-2025-21230 CVE-2025-21231 CVE-2025-21232 CVE-2025-21233 CVE-2025-21234 CVE-2025-21235 CVE-2025-21236 CVE-2025-21237 CVE-2025-21238 CVE-2025-21239 CVE-2025-21240 CVE-2025-21241 CVE-2025-21242 CVE-2025-21243 CVE-2025-21244 CVE-2025-21245 CVE-2025-21246 CVE-2025-21248 CVE-2025-21249 CVE-2025-21250 CVE-2025-21251 CVE-2025-21252 CVE-2025-21255 CVE-2025-21256 CVE-2025-21257 CVE-2025-21258 CVE-2025-21260 CVE-2025-21261 CVE-2025-21263 CVE-2025-21265 CVE-2025-21266 CVE-2025-21268 CVE-2025-21269 CVE-2025-21270 CVE-2025-21272 CVE-2025-21273 CVE-2025-21274 CVE-2025-21275 CVE-2025-21276 CVE-2025-21277 CVE-2025-21278 CVE-2025-21280 CVE-2025-21281 CVE-2025-21282 CVE-2025-21284 CVE-2025-21285 CVE-2025-21286 CVE-2025-21287 CVE-2025-21288 CVE-2025-21289 CVE-2025-21290 CVE-2025-21291 CVE-2025-21292 CVE-2025-21293 CVE-2025-21294 CVE-2025-21295 CVE-2025-21296 CVE-2025-21298 CVE-2025-21299 CVE-2025-21300 CVE-2025-21301 CVE-2025-21302 CVE-2025-21303 CVE-2025-21305 CVE-2025-21306 CVE-2025-21307 CVE-2025-21308 CVE-2025-21310 CVE-2025-21312 CVE-2025-21314 CVE-2025-21316 CVE-2025-21317 CVE-2025-21318 CVE-2025-21319 CVE-2025-21320 CVE-2025-21321 CVE-2025-21323 CVE-2025-21324 CVE-2025-21325 CVE-2025-21327 CVE-2025-21328 CVE-2025-21329 CVE-2025-21330 CVE-2025-21331 CVE-2025-21332 CVE-2025-21333 CVE-2025-21334 CVE-2025-21335 CVE-2025-21336 CVE-2025-21338 CVE-2025-21339 CVE-2025-21340 CVE-2025-21341 CVE-2025-21343 CVE-2025-21370 CVE-2025-21374 CVE-2025-21378 CVE-2025-21382 CVE-2025-21389 CVE-2025-21409 CVE-2025-21411 CVE-2025-21413 CVE-2025-21417

Affected products

Windows 10 Version 1809 for 32-bit Systems
Windows 10 Version 1809 for x64-based Systems
Windows Server 2019

References

Microsoft support article Microsoft Security Update Guide

See this and every Microsoft update ranked by real-world risk on the Microsoft Patch Tracker.