Note: This vulnerability (CVE-2008-4250) was originally published in 2008, however CISA added it to the Known Exploited Vulnerabilities (KEV) catalog on 2026-05-20 due to detected active exploitation.
EPSS Alert: The probability of this vulnerability being exploited in the next 30 days is 93.5% (percentile: 100%).
Summary
| Parameter | Value |
|---|---|
| CVE ID | CVE-2008-4250 |
| Alert Source | CISA KEV - Active Exploitation |
| CVE Publication Year | 2008 |
| Date Published | 2026-05-20 |
| Vendor | Microsoft |
| Product | Windows |
| CVSS Score | 10.0 (critical) |
| EPSS Score | 93.5% (percentile: 100%) |
| CISA KEV | Yes - confirmed active exploitation |
| Ransomware | Not confirmed |
| Remediation Deadline | 2026-06-03 |
Vulnerability Description
Microsoft Windows contains a buffer overflow vulnerability in the Windows Server Service that allows remote attackers to execute arbitrary code via a crafted RPC request that triggers an overflow during path canonicalization.
Required Actions
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
High Exploitation Risk
According to EPSS (Exploit Prediction Scoring System), the probability of this vulnerability being exploited within 30 days is very high (93.5%). We recommend prioritizing this update.
Who Is Affected?
This vulnerability affects Windows by Microsoft. Check if your organization uses this software and requires updates.
Sources
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