Is CVE-2012-4193 in the CISA KEV catalog?

No. CVE-2012-4193 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2012-4193?

CVE-2012-4193 has a CVSS v2 base score of 6.8 (MEDIUM).

What is the EPSS score for CVE-2012-4193?

CVE-2012-4193 has an EPSS score of 1.16% (63th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2012-4193?

Upgrade DeveloperEdition to 16.0.1 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2012-4193

MEDIUM

6.8

CVSS v2

NVD

Description

Mozilla Firefox before 16.0.1, Firefox ESR 10.x before 10.0.9, Thunderbird before 16.0.1, Thunderbird ESR 10.x before 10.0.9, and SeaMonkey before 2.13.1 omit a security check in the defaultValue function during the unwrapping of security wrappers, which allows remote attackers to bypass the Same Origin Policy and read the properties of a Location object, or execute arbitrary JavaScript code, via a crafted web site.

CWE-346

How to fix

Remediation Available

DeveloperEditionWindows application

Affected:16.0.1Fixed in:16.0.1Mozilla

Affected:10.0 10.0.9Fixed in:10.0.9Mozilla

Mozilla Firefox (en-US)Windows application

Affected:10.0 10.0.9Fixed in:10.0.9Mozilla

Affected:16.0.1Fixed in:16.0.1Mozilla

Mozilla Thunderbird (en-US)Windows application

Affected:16.0.1Fixed in:16.0.1Mozilla

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

1.16%probability of exploitation in 30 days

63rdpercentile

Moderate risk: more likely to be exploited than 63% of all known CVEs.

References

Patch1

bugzilla.mozilla.org

Vendor Advisory1

mozilla.org

Third-Party Advisory12

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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 2026-04-29.