Is CVE-2012-4179 in the CISA KEV catalog?

No. CVE-2012-4179 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2012-4179?

CVE-2012-4179 has a CVSS v2 base score of 9.3 (HIGH).

What is the EPSS score for CVE-2012-4179?

CVE-2012-4179 has an EPSS score of 4.73% (91th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2012-4179?

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

CVE & CISA-KEV Catalog

CVE-2012-4179

HIGHEPSS 91th pctl

9.3

CVSS v2

NVD

Description

Use-after-free vulnerability in the nsHTMLCSSUtils::CreateCSSPropertyTxn function 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 allows remote attackers to execute arbitrary code or cause a denial of service (heap memory corruption) via unspecified vectors.

CWE-416Use After Free

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

4.73%probability of exploitation in 30 days

91stpercentile

High risk: more likely to be exploited than 91% of all known CVEs.

References

Vendor Advisory2

Third-Party Advisory17

Related Vulnerabilities

Other CWE-416 (Use After Free) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2019-0708	Critical	9.8	100%	KEV + Ransom	-
CVE-2021-31166	Critical	9.8	100%	KEV	Fix
CVE-2015-5119	Critical	9.8	99%	KEV	-
CVE-2010-3962	High	8.1	97%	KEV	-
CVE-2015-0313	Critical	9.8	96%	KEV	Fix
CVE-2017-9798	High	7.5	95%	-	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.