Integer overflow in the Microsoft Malware Protection Engine (mpengine.dll), as used by Windows Live OneCare, Antigen, Defender, and Forefront Security, allows user-assisted remote attackers to execute arbitrary code via a crafted PDF file.
Conclusion & alert: CVE-2006-5270 is rated High Risk (71.8/100): CVSS Critical severity, with high exploitation likelihood (EPSS 50.98%, 98th 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 | 2025-10-02 | 50.59% | 50.98% | +0.39% |
| 2 | 2025-03-30 | 65.95% | 50.59% | -15.36% |
| 3 | 2025-03-29 | — | 65.95% | — |
Full EPSS history (14 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 | antigen | — | cpe:2.3:a:microsoft:antigen:*:*:*:*:*:*:*:* |
| microsoft | forefront_security | — | cpe:2.3:a:microsoft:forefront_security:*:*:*:*:*:*:*:* |
| microsoft | malware_protection_engine | — | cpe:2.3:a:microsoft:malware_protection_engine:*:*:*:*:*:*:*:* |
| microsoft | windows_defender | — | cpe:2.3:a:microsoft:windows_defender:*:*:*:*:*:*:*:* |
| microsoft | windows_live_onecare | — | cpe:2.3:a:microsoft:windows_live_onecare:*:*:*:*:*:*:*:* |