How severe is CVE-2008-4166?

CVE-2008-4166 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2008-4166 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (80th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2008-4166?

CVE-2008-4166 affects Avantbrowser Avant Browser. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2008-4166?

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

When was CVE-2008-4166 published?

CVE-2008-4166 was published on 2008-09-22 and last updated on 2026-06-16.

CVE-2008-4166

CVE-2008-4166 is a medium-severity vulnerability in Avantbrowser Avant Browser with a CVSS 2.0 base score of 4.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-189.

Key facts

Severity: Medium (CVSS 2.0 base score 4.3)
EPSS exploit prediction: 2% (80th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-189
Affected product: Avantbrowser Avant Browser
Published: 2008-09-22
Last modified: 2026-06-16

Description

Integer overflow in the JavaScript engine in Avant Browser 11.7 Build 9 and earlier allows remote attackers to cause a denial of service (application crash) by attempting to URL encode a string containing many instances of an invalid character.

Frequently asked questions

What is CVE-2008-4166?: Integer overflow in the JavaScript engine in Avant Browser 11.7 Build 9 and earlier allows remote attackers to cause a denial of service (application crash) by attempting to URL encode a string containing many instances of an invalid character.
How severe is CVE-2008-4166?: CVE-2008-4166 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2008-4166 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (80th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2008-4166?: CVE-2008-4166 affects Avantbrowser Avant Browser. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2008-4166?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2008-4166 published?: CVE-2008-4166 was published on 2008-09-22 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:avantbrowser:avant_browser:*:build_9:*:*:*:*:*:*

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