How severe is CVE-2012-3975?

CVE-2012-3975 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2012-3975 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (77th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2012-3975?

CVE-2012-3975 primarily affects Mozilla Firefox. In total, 328 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2012-3975?

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

When was CVE-2012-3975 published?

CVE-2012-3975 was published on 2012-08-29 and last updated on 2026-06-16.

CVE-2012-3975

CVE-2012-3975 is a medium-severity vulnerability in Mozilla Firefox 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-200.

Key facts

Severity: Medium (CVSS 2.0 base score 4.3)
EPSS exploit prediction: 2% (77th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-200
Affected product: Mozilla Firefox
Published: 2012-08-29
Last modified: 2026-06-16

Description

The DOMParser component in Mozilla Firefox before 15.0, Thunderbird before 15.0, and SeaMonkey before 2.12 loads subresources during parsing of text/html data within an extension, which allows remote attackers to obtain sensitive information by providing crafted data to privileged extension code.

Frequently asked questions

What is CVE-2012-3975?: The DOMParser component in Mozilla Firefox before 15.0, Thunderbird before 15.0, and SeaMonkey before 2.12 loads subresources during parsing of text/html data within an extension, which allows remote attackers to obtain sensitive information by providing crafted data to privileged extension code.
How severe is CVE-2012-3975?: CVE-2012-3975 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2012-3975 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (77th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2012-3975?: CVE-2012-3975 primarily affects Mozilla Firefox. In total, 328 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2012-3975?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2012-3975 published?: CVE-2012-3975 was published on 2012-08-29 and last updated on 2026-06-16.

References

Affected products (328)

cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:1.0:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:1.0:preview_release:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:1.0.1:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:1.0.2:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:1.0.3:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:1.0.4:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:1.0.5:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:1.0.6:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:1.0.7:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:1.0.8:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:1.4.1:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:1.5:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:1.5:beta1:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:1.5:beta2:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:1.5.0.1:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:1.5.0.2:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:1.5.0.3:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:1.5.0.4:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:1.5.0.5:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:1.5.0.6:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:1.5.0.7:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:1.5.0.8:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:1.5.0.9:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:1.5.0.10:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:1.5.0.11:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:1.5.0.12:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:1.5.1:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:1.5.2:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:1.5.3:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:1.5.4:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:1.5.5:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:1.5.6:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:1.5.7:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:1.5.8:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:1.8:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:2.0:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:2.0.0.1:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:2.0.0.2:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:2.0.0.3:*:*:*:*:*:*:*

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