Patch tracker / Products / Windows Server 2025
Windows Server 2025: vulnerabilities and security updates
Every CVE affecting Windows Server 2025 and the Microsoft update (KB) that fixes it, ranked by real-world risk. Actively exploited (CISA KEV) first, then EPSS exploit probability, on top of CVSS severity.
CVEs
75
Updates (KBs)
7
Actively exploited (KEV)
1
Critical Severity
74
CVEs affecting Windows Server 2025
| CVE | Severity | CVSS | EPSS | Status |
|---|---|---|---|---|
| CVE-2024-43451 | Critical | 9.8 | 82% | KEV |
| CVE-2025-21268 | Critical | 9.8 | 81% | - |
| CVE-2025-21269 | Critical | 9.8 | 81% | - |
| CVE-2025-21329 | Critical | 9.8 | 81% | - |
| CVE-2025-21328 | Critical | 9.8 | 81% | - |
| CVE-2025-21189 | Critical | 9.8 | 81% | - |
| CVE-2025-21276 | Critical | 9.8 | 81% | - |
| CVE-2025-21332 | Critical | 9.8 | 81% | - |
| CVE-2026-48566 | Critical | 9.8 | 80% | - |
| CVE-2026-33834 | Critical | 9.8 | 80% | - |
| CVE-2026-33839 | Critical | 9.8 | 80% | - |
| CVE-2026-34329 | Critical | 9.8 | 80% | - |
| CVE-2026-34330 | Critical | 9.8 | 80% | - |
| CVE-2026-34331 | Critical | 9.8 | 80% | - |
| CVE-2026-34333 | Critical | 9.8 | 80% | - |
| CVE-2026-34342 | Critical | 9.8 | 80% | - |
| CVE-2026-34343 | Critical | 9.8 | 80% | - |
| CVE-2026-34344 | Critical | 9.8 | 80% | - |
| CVE-2026-34345 | Critical | 9.8 | 80% | - |
| CVE-2026-34347 | Critical | 9.8 | 80% | - |
| CVE-2026-34350 | Critical | 9.8 | 80% | - |
| CVE-2026-34351 | Critical | 9.8 | 80% | - |
| CVE-2026-35415 | Critical | 9.8 | 80% | - |
| CVE-2026-35416 | Critical | 9.8 | 80% | - |
| CVE-2026-35417 | Critical | 9.8 | 80% | - |
| CVE-2026-35418 | Critical | 9.8 | 80% | - |
| CVE-2026-35419 | Critical | 9.8 | 80% | - |
| CVE-2026-35420 | Critical | 9.8 | 80% | - |
| CVE-2026-35421 | Critical | 9.8 | 80% | - |
| CVE-2026-35422 | Critical | 9.8 | 80% | - |
| CVE-2026-35423 | Critical | 9.8 | 80% | - |
| CVE-2026-35424 | Critical | 9.8 | 80% | - |
| CVE-2026-40377 | Critical | 9.8 | 80% | - |
| CVE-2026-40380 | Critical | 9.8 | 80% | - |
| CVE-2026-40399 | Critical | 9.8 | 80% | - |
| CVE-2026-40405 | Critical | 9.8 | 80% | - |
| CVE-2026-40406 | Critical | 9.8 | 80% | - |
| CVE-2026-40407 | Critical | 9.8 | 80% | - |
| CVE-2026-40408 | Critical | 9.8 | 80% | - |
| CVE-2026-40410 | Critical | 9.8 | 80% | - |
| CVE-2026-40414 | Critical | 9.8 | 80% | - |
| CVE-2026-40415 | Critical | 9.8 | 80% | - |
| CVE-2026-41088 | Critical | 9.8 | 80% | - |
| CVE-2026-41089 | Critical | 9.8 | 80% | - |
| CVE-2026-41095 | Critical | 9.8 | 80% | - |
| CVE-2026-41096 | Critical | 9.8 | 80% | - |
| CVE-2026-32161 | Critical | 9.8 | 80% | - |
| CVE-2026-32170 | Critical | 9.8 | 80% | - |
| CVE-2026-42825 | Critical | 9.8 | 80% | - |
| CVE-2026-42896 | Critical | 9.8 | 80% | - |
| CVE-2026-33835 | Critical | 9.8 | 80% | - |
| CVE-2026-33837 | Critical | 9.8 | 80% | - |
| CVE-2026-33838 | Critical | 9.8 | 80% | - |
| CVE-2026-34332 | Critical | 9.8 | 80% | - |
| CVE-2026-34334 | Critical | 9.8 | 80% | - |
| CVE-2026-34336 | Critical | 9.8 | 80% | - |
| CVE-2026-34337 | Critical | 9.8 | 80% | - |
| CVE-2026-34338 | Critical | 9.8 | 80% | - |
| CVE-2026-34339 | Critical | 9.8 | 80% | - |
| CVE-2026-34340 | Critical | 9.8 | 80% | - |
| CVE-2026-34341 | Critical | 9.8 | 80% | - |
| CVE-2026-40369 | Critical | 9.8 | 80% | - |
| CVE-2026-40382 | Critical | 9.8 | 80% | - |
| CVE-2026-40397 | Critical | 9.8 | 80% | - |
| CVE-2026-32209 | Critical | 9.8 | 80% | - |
| CVE-2026-40398 | Critical | 9.8 | 80% | - |
| CVE-2026-40401 | Critical | 9.8 | 80% | - |
| CVE-2026-40403 | Critical | 9.8 | 80% | - |
| CVE-2026-40413 | Critical | 9.8 | 80% | - |
| CVE-2026-41097 | Critical | 9.8 | 80% | - |
| CVE-2025-54518 | Critical | 9.8 | 80% | - |
| CVE-2026-21530 | Critical | 9.8 | 80% | - |
| CVE-2026-33841 | Critical | 9.8 | 80% | - |
| CVE-2026-33840 | Critical | 9.8 | 80% | - |
| CVE-2025-21247 | High | 8.8 | 59% | - |
Updates (KBs) for Windows Server 2025
Ranked across all products on the Microsoft patch tracker and the CVE and vulnerability management reference. Browse every product: product index.