Microsoft Windows Server Service's Path Canonicalization Buffer Overflow Enables Remote Code Execution via Crafted RPC Requests; CISA's June 3rd KEV Deadline Has Passed

Last refreshed2026-09-27

Status: KEV | Advisory ID: CVE-2008-4250

Key Details

CVE	CVE-2008-4250
Vulnerability Name	Microsoft Windows Buffer Overflow Vulnerability
Affected products	Microsoft Windows
Exploitation status	Listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, indicating confirmed active exploitation.
Classified as	CWE-94 (Improper Control of Generation of Code ('Code Injection'))
KEV listing	Added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2026-05-20.
Exploitation prediction (EPSS)	98.75% probability of exploitation in the next 30 days (100% percentile) -- FIRST.org's EPSS model.
Federal remediation deadline	2026-06-03 (CISA KEV, Binding Operational Directive).

Affected Products, Subsystems & Sectors

Vendor	Product	Affected Versions	Patch Status
Microsoft	Windows

Vendor

Product

Affected Versions

Patch Status

Microsoft

Windows

Subsystems	EWS Workstation Delivery/Virtualization
Sectors	All Sectors

What to Know

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.

What to Do

Monitor Microsoft's web page for any future patch releases.

References

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2008-4250
CVE	https://www.cve.org/CVERecord?id=CVE-2008-4250

Source

Reference

NVD

https://nvd.nist.gov/vuln/detail/CVE-2008-4250

CVE

https://www.cve.org/CVERecord?id=CVE-2008-4250

KEV Required Action

Field	Value
KEV Link	https://www.cisa.gov/known-exploited-vulnerabilities-catalog
Date Added to KEV	2026-05-20
Required Action Due Date	2026-06-03
Required Action	Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Field

Value

KEV Link

https://www.cisa.gov/known-exploited-vulnerabilities-catalog

Date Added to KEV

2026-05-20

Required Action Due Date

2026-06-03

Required Action

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.