Is CVE-2012-3986 in the CISA KEV catalog?

No. CVE-2012-3986 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2012-3986?

CVE-2012-3986 has a CVSS v2 base score of 4.3 (MEDIUM).

What is the EPSS score for CVE-2012-3986?

CVE-2012-3986 has an EPSS score of 2.51% (83th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2012-3986?

Upgrade DeveloperEdition to 16.0 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2012-3986

MEDIUMEPSS 83th pctl

4.3

CVSS v2

NVD

Description

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 do not properly restrict calls to DOMWindowUtils (aka nsDOMWindowUtils) methods, which allows remote attackers to bypass intended access restrictions via crafted JavaScript code.

CWE-20Improper Input Validation

How to fix

Remediation Available

DeveloperEditionWindows application

Affected:16.0Fixed in:16.0Mozilla

Affected:10.0.8Fixed in:10.0.8Mozilla

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

2.51%probability of exploitation in 30 days

83rdpercentile

Elevated risk: more likely to be exploited than 83% of all known CVEs.

References

Vendor Advisory2

Third-Party Advisory17

Related Vulnerabilities

Other CWE-20 (Improper Input Validation) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-3400	Critical	10.0	100%	KEV + Ransom	-
CVE-2021-45105	Medium	5.9	100%	-	Fix
CVE-2021-44228	Critical	10.0	100%	KEV + Ransom	Fix
CVE-2021-21985	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2018-7600	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2020-3452	High	7.5	100%	KEV	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.