Is CVE-2012-4218 being actively exploited?

CVE-2012-4218 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2012-4218?

CVE-2012-4218 has a CVSS 2.0 base score of 10.0 (HIGH).

CVE-2012-4218

HIGH · CVSS 10.0EPSS 5.6%EU EUVD

Use-after-free vulnerability in the BuildTextRunsScanner::BreakSink::SetBreaks function in Mozilla Firefox before 17.0, Thunderbird before 17.0, and SeaMonkey before 2.14 allows remote attackers to execute arbitrary code or cause a denial of service (heap memory corruption) via unspecified vectors.

Key facts

CVSS score: 10.0 (v2.0)
Severity: HIGH
CVSS vector: AV:N/AC:L/Au:N/C:C/I:C/A:C
Weakness (CWE): CWE-416
EPSS score: 5.6% (93th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2012-4162)
Published: November 21, 2012
NVD last modified: June 16, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2012-4162 in the EU Vulnerability Database. Last updated in EUVD on August 6, 2024.

View on the EU Vulnerability Database

Affected products

canonical / ubuntu linux
canonical / ubuntu linux
canonical / ubuntu linux
canonical / ubuntu linux
mozilla / firefox
mozilla / seamonkey
mozilla / thunderbird
opensuse / opensuse
opensuse / opensuse
opensuse / opensuse
suse / linux enterprise desktop
suse / linux enterprise desktop
suse / linux enterprise server
suse / linux enterprise server
suse / linux enterprise server
suse / linux enterprise software development kit
suse / linux enterprise software development kit

Certified products that may be affected

2 FIPS 140 or Common Criteria certified products, from automated matching by sec-certs.org.

SUSE Linux Enterprise Server 11 Service Pack 2 on IBM System z - SUSE Linux Products Gmbh - Common Criteria BSI-DSZ-CC-0852-2013 - archived
SUSE Linux Enterprise Server 11 Service Pack 2 including KVM virtualization - SUSE Linux Products Gmbh - Common Criteria BSI-DSZ-CC-0787-2013 - archived

References

http://lists.opensuse.org/opensuse-security-announce/2012-11/msg00021.html(Mailing List, Third Party Advisory)
http://lists.opensuse.org/opensuse-security-announce/2013-01/msg00022.html(Mailing List, Third Party Advisory)
http://lists.opensuse.org/opensuse-updates/2012-11/msg00090.html(Mailing List, Third Party Advisory)
http://lists.opensuse.org/opensuse-updates/2012-11/msg00092.html(Mailing List, Third Party Advisory)
http://lists.opensuse.org/opensuse-updates/2012-11/msg00093.html(Mailing List, Third Party Advisory)
http://secunia.com/advisories/51369(Broken Link)
http://secunia.com/advisories/51370(Broken Link)
http://secunia.com/advisories/51381(Broken Link)
http://secunia.com/advisories/51434(Broken Link)
http://secunia.com/advisories/51439(Broken Link)
http://secunia.com/advisories/51440(Broken Link)
http://www.mozilla.org/security/announce/2012/mfsa2012-105.html(Vendor Advisory)
http://www.securityfocus.com/bid/56640(Third Party Advisory, VDB Entry)
http://www.ubuntu.com/usn/USN-1636-1(Third Party Advisory)
http://www.ubuntu.com/usn/USN-1638-1(Third Party Advisory)
http://www.ubuntu.com/usn/USN-1638-2(Third Party Advisory)
http://www.ubuntu.com/usn/USN-1638-3(Third Party Advisory)
https://bugzilla.mozilla.org/show_bug.cgi?id=767765(Issue Tracking, Vendor Advisory)
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A16885(Third Party Advisory)

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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