Is CVE-2012-3989 in the CISA KEV catalog?

No. CVE-2012-3989 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2012-3989?

CVE-2012-3989 has a CVSS v2 base score of 9.3 (HIGH).

What is the EPSS score for CVE-2012-3989?

CVE-2012-3989 has an EPSS score of 3.46% (88th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2012-3989?

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

CVE & CISA-KEV Catalog

CVE-2012-3989

HIGHEPSS 88th pctl

9.3

CVSS v2

NVD

Description

Mozilla Firefox before 16.0, Thunderbird before 16.0, and SeaMonkey before 2.13 do not properly perform a cast of an unspecified variable during use of the instanceof operator on a JavaScript object, which allows remote attackers to execute arbitrary code or cause a denial of service (assertion failure) via a crafted web site.

CWE-119Buffer Overflow

How to fix

Remediation Available

DeveloperEditionWindows application

Affected:16.0Fixed in:16.0Mozilla

Mozilla Firefox (en-US)Windows application

Affected:16.0Fixed in:16.0Mozilla

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

3.46%probability of exploitation in 30 days

88thpercentile

Elevated risk: more likely to be exploited than 88% of all known CVEs.

References

Vendor Advisory2

Third-Party Advisory3

Other references6

Related Vulnerabilities

Other CWE-119 (Buffer Overflow) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-4966	Critical	9.4	100%	KEV + Ransom	Fix
CVE-2017-11882	High	7.8	100%	KEV + Ransom	-
CVE-2020-0796	Critical	10.0	100%	KEV + Ransom	-
CVE-2008-4250	Critical	9.8	99%	KEV	-
CVE-2017-15944	Critical	9.8	98%	KEV	Fix
CVE-2015-0014	High	10.0	97%	-	-

Embed a live status badge for CVE-2012-3989

Markdown

[![CVE-2012-3989](https://tridentstack.com/cve/badge/CVE-2012-3989.svg)](https://tridentstack.com/cve/CVE-2012-3989)

HTML

<a href="https://tridentstack.com/cve/CVE-2012-3989"><img src="https://tridentstack.com/cve/badge/CVE-2012-3989.svg" alt="CVE-2012-3989"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

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.