Is CVE-2008-4299 in the CISA KEV catalog?

No. CVE-2008-4299 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2008-4299?

CVE-2008-4299 has a CVSS v2 base score of 5.0 (MEDIUM).

What is the EPSS score for CVE-2008-4299?

CVE-2008-4299 has an EPSS score of 15.86% (96th percentile), estimating the probability of exploitation in the next 30 days.

CVE & CISA-KEV Catalog

CVE-2008-4299

MEDIUMEPSS 96th pctl

5.0

CVSS v2

NVD

Description

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.

CWE-189

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

15.86%probability of exploitation in 30 days

96thpercentile

Very high risk: more likely to be exploited than 96% of all known CVEs.

References

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-23.