Is CVE-2012-4184 in the CISA KEV catalog?

No. CVE-2012-4184 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2012-4184?

CVE-2012-4184 has a CVSS v2 base score of 4.3 (MEDIUM).

What is the EPSS score for CVE-2012-4184?

CVE-2012-4184 has an EPSS score of 1.80% (76th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2012-4184?

Upgrade DeveloperEdition to 10.0.8 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2012-4184

MEDIUMEPSS 76th pctl

4.3

CVSS v2

NVD

Description

The Chrome Object Wrapper (COW) implementation in Mozilla Firefox before 16.0, Firefox ESR 10.x before 10.0.8, Thunderbird before 16.0, Thunderbird ESR 10.x before 10.0.8, and SeaMonkey before 2.13 does not prevent access to properties of a prototype for a standard class, which allows remote attackers to execute arbitrary JavaScript code with chrome privileges via a crafted web site.

CWE-79Cross-Site Scripting (XSS)

How to fix

Remediation Available

DeveloperEditionWindows application

Affected:10.0.8Fixed in:10.0.8Mozilla

Affected:16.0Fixed in:16.0Mozilla

Mozilla Firefox (en-US)Windows application

Affected:16.0Fixed in:16.0Mozilla

Affected:10.0.8Fixed in:10.0.8Mozilla

Mozilla Thunderbird (en-US)Windows application

Affected:16.0Fixed in:16.0Mozilla

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

1.80%probability of exploitation in 30 days

76thpercentile

Elevated risk: more likely to be exploited than 76% of all known CVEs.

References

Vendor Advisory2

Third-Party Advisory11

Other references1

osvdb.org

Related Vulnerabilities

Other CWE-79 (Cross-Site Scripting (XSS)) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-11022	Medium	6.9	99%	-	Fix
CVE-2019-3929	Critical	9.8	99%	KEV	Fix
CVE-2020-9496	Medium	6.1	99%	-	-
CVE-2023-28341	Medium	6.1	99%	-	Fix
CVE-2018-12998	Medium	6.1	98%	-	-
CVE-2025-4123	High	7.6	98%	-	Fix

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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.