Heap-based buffer overflow in Microsoft Windows Media Player 6.4 allows remote attackers to execute arbitrary code via (1) a crafted ASF file or (2) crafted streaming content, aka "WMP Heap Overflow Vulnerability."
Conclusion & alert: CVE-2009-2527 is rated High Risk (67.5/100): CVSS Critical severity, with high exploitation likelihood (EPSS 41.58%, 97th percentile). Core evidence: EPSS ranks this CVE among the most likely to be exploited in the near term. Mandatory action: High exploitation likelihood—assess exposure and prioritize remediation.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-05-02 | 45.41% | 41.58% | -3.83% |
| 2 | 2026-03-05 | 47.92% | 45.41% | -2.51% |
| 3 | 2025-12-28 | — | 47.92% | — |
Full EPSS history (33 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 9.3 | 2.0 | HIGH |
|
8.6 | 10.0 | [email protected] |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| microsoft | windows_media_player | 6.4 | cpe:2.3:a:microsoft:windows_media_player:6.4:*:*:*:*:*:*:* |