win32k.sys in the kernel-mode drivers in Microsoft Windows XP SP2 and SP3 and Server 2003 SP2 does not properly validate addresses, which allows local users to gain privileges via a crafted application, aka "Win32k Memory Corruption Vulnerability."
Conclusion & alert: CVE-2013-3899 is rated Moderate Risk (58.8/100): CVSS High severity, with medium exploitation likelihood (EPSS 2.26%). Core evidence: EPSS rose +1.75% over the last day, indicating growing attacker interest. Mandatory action: Review affected assets and schedule 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 | 2026-06-15 | 0.50% | 2.26% | +1.75% |
| 2 | 2025-03-30 | 0.23% | 0.50% | +0.28% |
| 3 | 2025-03-29 | — | 0.23% | — |
Full EPSS history (7 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 7.2 | 2.0 | HIGH |
|
3.9 | 10.0 | [email protected] |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| microsoft | windows_server_2003 | — | cpe:2.3:o:microsoft:windows_server_2003:*:sp2:*:*:*:*:*:* |
| microsoft | windows_xp | — | cpe:2.3:o:microsoft:windows_xp:*:sp3:*:*:*:*:*:* |
| microsoft | windows_xp | — | cpe:2.3:o:microsoft:windows_xp:-:sp2:x64:*:*:*:*:* |