How severe is CVE-2009-2665?

CVE-2009-2665 has a CVSS 2.0 base score of 10.0, rated critical severity.

Is CVE-2009-2665 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-2665?

CVE-2009-2665 primarily affects Mozilla Firefox. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-2665?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2009-2665 published?

CVE-2009-2665 was published on 2009-08-04 and last updated on 2026-06-16.

CVE-2009-2665

CVE-2009-2665 is a critical-severity vulnerability in Mozilla Firefox with a CVSS 2.0 base score of 10.0. 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-94.

Key facts

Severity: Critical (CVSS 2.0 base score 10.0)
EPSS exploit prediction: 3% (84th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-94
Affected product: Mozilla Firefox
Published: 2009-08-04
Last modified: 2026-06-16

Description

The nsDocument::SetScriptGlobalObject function in content/base/src/nsDocument.cpp in Mozilla Firefox 3.5.x before 3.5.2, when certain add-ons are enabled, does not properly handle a Link HTTP header, which allows remote attackers to execute arbitrary JavaScript with chrome privileges via a crafted web page, related to an incorrect security wrapper.

Frequently asked questions

What is CVE-2009-2665?: The nsDocument::SetScriptGlobalObject function in content/base/src/nsDocument.cpp in Mozilla Firefox 3.5.x before 3.5.2, when certain add-ons are enabled, does not properly handle a Link HTTP header, which allows remote attackers to execute arbitrary JavaScript with chrome privileges via a crafted web page, related to an incorrect security wrapper.
How severe is CVE-2009-2665?: CVE-2009-2665 has a CVSS 2.0 base score of 10.0, rated critical severity.
Is CVE-2009-2665 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-2665?: CVE-2009-2665 primarily affects Mozilla Firefox. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2009-2665?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2009-2665 published?: CVE-2009-2665 was published on 2009-08-04 and last updated on 2026-06-16.

References

Affected products (3)

cpe:2.3:a:mozilla:firefox:3.5:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:3.5.1:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:3.5.2:*:*:*:*:*:*:*

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