Microsoft Internet Explorer 5.01 and 6 does not properly identify the originating domain zone when handling redirects, which allows remote attackers to read cross-domain web pages and possibly execute code via unspecified vectors involving a crafted web page, aka "Source Element Cross-Domain Vulnerability."
Conclusion & alert: CVE-2006-3639 is rated Moderate Risk (59.6/100): CVSS High severity, with high exploitation likelihood (EPSS 40.59%, 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 | 2026-05-07 | 45.07% | 40.59% | -4.48% |
| 2 | 2025-03-30 | 63.48% | 45.07% | -18.41% |
| 3 | 2025-03-29 | — | 63.48% | — |
Full EPSS history (18 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 7.5 | 2.0 | HIGH |
|
10.0 | 6.4 | [email protected] |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| microsoft | ie | 6 | cpe:2.3:a:microsoft:ie:6:windows_server_2003_sp1:*:*:*:*:*:* |
| microsoft | internet_explorer | 5.01 | cpe:2.3:a:microsoft:internet_explorer:5.01:*:*:*:*:*:*:* |