Reference page — cumulative record through Wednesday, October 7, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
Windows Server Version 2004
Product reference — Windows Server Version 2004 by Microsoft · sector: Operating Systems & Platforms. Cumulative disclosure record for this product across the archive.
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Product totals
| All-time | YTD | |
|---|---|---|
| CVEs | 222 | 1 |
| KEV entries | 27 | 0 |
| KEV/100 | Med CVSS | Med EPSS | C | H | M | L |
|---|---|---|---|---|---|---|
| 12.2 | 7.8 | .0161 | 11 | 160 | 51 | 0 |
KEV/100 = KEV entries ÷ CVEs × 100. Med CVSS / Med EPSS are medians over this product's disclosures. C/H/M/L = disclosures by CVSS severity band.
Monthly disclosures
Trend (by first-seen month, full archive): ▁▁▁▁▁▁▁▅▁▁▁█▃▄▁▄▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁
| Month | New CVEs |
|---|---|
| 2025-11 | 0 |
| 2025-12 | 0 |
| 2026-01 | 0 |
| 2026-02 | 0 |
| 2026-03 | 0 |
| 2026-04 | 0 |
| 2026-05 | 0 |
| 2026-06 | 1 |
| 2026-07 | 0 |
| 2026-08 | 0 |
| 2026-09 | 0 |
| 2026-10 | 0 |
Notable CVEs
Ranked by the published formula: KEV → EPSS → CVSS → CVE ID.
| CVE | CVSS | EPSS %ile | Severity | KEV | First seen |
|---|---|---|---|---|---|
| CVE-2021-31166 | 9.8 | 100.0 | CRITICAL | YES | 2021-05-11 |
| CVE-2020-1472 | 5.5 | 99.9 | MEDIUM | YES | 2020-08-17 |
| CVE-2021-40444 | 8.8 | 99.9 | HIGH | YES | 2021-11-03 |
| CVE-2021-1675 | 7.8 | 99.7 | HIGH | YES | 2021-11-03 |
| CVE-2021-31955 | 5.5 | 99.6 | MEDIUM | YES | 2021-06-08 |
| CVE-2021-1732 | 7.8 | 99.6 | HIGH | YES | 2021-11-03 |
| CVE-2021-42287 | 7.5 | 99.5 | HIGH | YES | 2022-04-11 |
| CVE-2021-40449 | 7.8 | 99.5 | HIGH | YES | 2021-10-13 |
| CVE-2021-42278 | 7.5 | 99.5 | HIGH | YES | 2022-04-11 |
| CVE-2021-36942 | 7.5 | 99.3 | HIGH | YES | 2021-11-03 |
| CVE-2020-1464 | 7.8 | 98.6 | HIGH | YES | 2020-08-17 |
| CVE-2021-36948 | 7.8 | 97.7 | HIGH | YES | 2021-11-03 |
| CVE-2021-31956 | 7.8 | 97.6 | HIGH | YES | 2021-06-08 |
| CVE-2021-34484 | 7.8 | 97.6 | HIGH | YES | 2022-03-31 |
| CVE-2021-41379 | 5.5 | 97.3 | MEDIUM | YES | 2022-03-03 |
Recent CVEs
| CVE | CVSS | EPSS %ile | Severity | KEV | First seen |
|---|---|---|---|---|---|
| CVE-2026-50508 | 7.5 | 59.0 | HIGH | — | 2026-06-09 |
| CVE-2021-42287 | 7.5 | 99.5 | HIGH | YES | 2022-04-11 |
| CVE-2021-42278 | 7.5 | 99.5 | HIGH | YES | 2022-04-11 |
| CVE-2021-34484 | 7.8 | 97.6 | HIGH | YES | 2022-03-31 |
| CVE-2021-34486 | 7.8 | 95.2 | HIGH | YES | 2022-03-28 |
| CVE-2021-41379 | 5.5 | 97.3 | MEDIUM | YES | 2022-03-03 |
| CVE-2021-43226 | 7.8 | 87.3 | HIGH | YES | 2021-12-15 |
| CVE-2021-42291 | 7.5 | 90.6 | HIGH | — | 2021-11-10 |
| CVE-2021-42288 | 5.7 | 51.7 | MEDIUM | — | 2021-11-10 |
| CVE-2021-42286 | 7.8 | 39.7 | HIGH | — | 2021-11-10 |
| CVE-2021-42284 | 6.8 | 89.5 | MEDIUM | — | 2021-11-10 |
| CVE-2021-42285 | 7.8 | 44.0 | HIGH | — | 2021-11-10 |
| CVE-2021-42283 | 8.8 | 39.7 | HIGH | — | 2021-11-10 |
| CVE-2021-42282 | 7.5 | 90.4 | HIGH | — | 2021-11-10 |
| CVE-2021-42280 | 5.5 | 60.0 | MEDIUM | — | 2021-11-10 |
KEV entries
| CVE | KEV added | CVSS | EPSS %ile | Severity |
|---|---|---|---|---|
| CVE-2021-43226 | 2025-10-06 | 7.8 | 87.3 | HIGH |
| CVE-2021-40450 | 2022-04-25 | 7.8 | 74.7 | HIGH |
| CVE-2021-41357 | 2022-04-25 | 7.8 | 74.7 | HIGH |
| CVE-2021-42287 | 2022-04-11 | 7.5 | 99.5 | HIGH |
| CVE-2021-42278 | 2022-04-11 | 7.5 | 99.5 | HIGH |
| CVE-2021-31166 | 2022-04-06 | 9.8 | 100.0 | CRITICAL |
| CVE-2021-34484 | 2022-03-31 | 7.8 | 97.6 | HIGH |
| CVE-2021-34486 | 2022-03-28 | 7.8 | 95.2 | HIGH |
| CVE-2021-41379 | 2022-03-03 | 5.5 | 97.3 | MEDIUM |
| CVE-2021-40449 | 2021-11-17 | 7.8 | 99.5 | HIGH |
| CVE-2020-1472 | 2021-11-03 | 5.5 | 99.9 | MEDIUM |
| CVE-2021-28310 | 2021-11-03 | 7.8 | 94.8 | HIGH |
| CVE-2020-1464 | 2021-11-03 | 7.8 | 98.6 | HIGH |
| CVE-2021-31201 | 2021-11-03 | 5.2 | 85.0 | MEDIUM |
| CVE-2021-31956 | 2021-11-03 | 7.8 | 97.6 | HIGH |
| CVE-2021-31199 | 2021-11-03 | 5.2 | 86.7 | MEDIUM |
| CVE-2020-17087 | 2021-11-03 | 7.8 | 92.5 | HIGH |
| CVE-2021-33739 | 2021-11-03 | 8.4 | 93.6 | HIGH |
| CVE-2021-31955 | 2021-11-03 | 5.5 | 99.6 | MEDIUM |
| CVE-2021-1732 | 2021-11-03 | 7.8 | 99.6 | HIGH |
| CVE-2021-1675 | 2021-11-03 | 7.8 | 99.7 | HIGH |
| CVE-2021-40444 | 2021-11-03 | 8.8 | 99.9 | HIGH |
| CVE-2021-36955 | 2021-11-03 | 7.8 | 90.4 | HIGH |
| CVE-2021-36948 | 2021-11-03 | 7.8 | 97.7 | HIGH |
| CVE-2021-36942 | 2021-11-03 | 7.5 | 99.3 | HIGH |
Related
Vendor: Microsoft — all products and the full vendor record.
Methodology
A product is a (vendor, product) pair as named in the affected-product data. Rate statistics are arithmetic over published figures. Counts key to first-seen day. Raw counts are not comparable across products; this is a reference page assembled from the public record, not a ranking by our judgment.
Sources. CVE Program (cvelistV5), NVD (NIST), CISA KEV, FIRST EPSS.
