CVE-2008-4299: Microsoft Internet Authentication Service Helper Com Component

Medium severity, CVSS 5.0. EPSS: 15.9% chance of exploitation in the next 30 days.

A certain ActiveX control in the Microsoft Internet Authentication Service (IAS) Helper COM Component in iashlpr.dll allows remote attackers to cause a denial of service (browser crash) via a large integer value in the first argument to the PutProperty method. NOTE: this issue was disclosed by an unreliable researcher, so it might be incorrect.

Affected products

• Microsoft Internet Authentication Service Helper Com Component: any version

Published 2008-09-29. Last modified 2026-06-16.