CVE-2009-4521 的 EPSS 分數歷史，展示風險變化與利用機率趨勢，支援漏洞優先級與安全分析。
| # | 日期 | 舊 EPSS 分數 | 新 EPSS 分數 | 變化（新 − 舊） |
|---|---|---|---|---|
| 1 | 2026-06-15 | 3.71% | 1.96% | -1.75% |
| 2 | 2026-01-01 | 2.96% | 3.71% | +0.75% |
| 3 | 2025-03-30 | 2.80% | 2.96% | +0.17% |
| 4 | 2025-03-29 | 2.96% | 2.80% | -0.17% |
| 5 | 2025-03-19 | 0.59% | 2.96% | +2.37% |
| 6 | 2025-03-17 | 0.93% | 0.59% | -0.34% |
| 7 | 2024-12-17 | 6.44% | 0.93% | -5.51% |
| 8 | 2024-04-04 | 6.46% | 6.44% | -0.02% |
| 9 | 2023-03-07 | 2.94% | 6.46% | +3.51% |
| 10 | 2022-02-04 | — | 2.94% | — |