How severe is CVE-2008-4299?

CVE-2008-4299 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2008-4299 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 16% (96th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2008-4299?

CVE-2008-4299 affects Microsoft Internet Authentication Service Helper Com Component. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2008-4299?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2008-4299 published?

CVE-2008-4299 was published on 2008-09-29 and last updated on 2026-06-16.

CVE-2008-4299

CVE-2008-4299 is a medium-severity vulnerability in Microsoft Internet Authentication Service Helper Com Component with a CVSS 2.0 base score of 5.0. Its EPSS exploit-prediction score of 16% places it in the 96th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-189.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 16% (96th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-189
Affected product: Microsoft Internet Authentication Service Helper Com Component
Published: 2008-09-29
Last modified: 2026-06-16

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.

Frequently asked questions

What is CVE-2008-4299?: 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.
How severe is CVE-2008-4299?: CVE-2008-4299 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2008-4299 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 16% (96th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2008-4299?: CVE-2008-4299 affects Microsoft Internet Authentication Service Helper Com Component. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2008-4299?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2008-4299 published?: CVE-2008-4299 was published on 2008-09-29 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:microsoft:internet_authentication_service_helper_com_component:*:*:*:*:*:*:*:*

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