CVE-2012-5830

CVE-2012-5830 is a high-severity vulnerability in Mozilla Firefox with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-416.

Key facts

• Severity: High (CVSS 3.x base score 8.8)
• CVSS v2: 6.8
• EPSS exploit prediction: 4% (89th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-416
• Affected product: Mozilla Firefox
• Published: 2012-11-21
• Last modified: 2026-06-16

Description

Use-after-free vulnerability in Mozilla Firefox before 17.0, Firefox ESR 10.x before 10.0.11, Thunderbird before 17.0, Thunderbird ESR 10.x before 10.0.11, and SeaMonkey before 2.14 on Mac OS X allows remote attackers to execute arbitrary code via an HTML document.

Frequently asked questions

What is CVE-2012-5830?

Use-after-free vulnerability in Mozilla Firefox before 17.0, Firefox ESR 10.x before 10.0.11, Thunderbird before 17.0, Thunderbird ESR 10.x before 10.0.11, and SeaMonkey before 2.14 on Mac OS X allows remote attackers to execute arbitrary code via an HTML document.

How severe is CVE-2012-5830?

CVE-2012-5830 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2012-5830 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (89th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2012-5830?

CVE-2012-5830 primarily affects Mozilla Firefox. In total, 26 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2012-5830?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2012-5830 published?

CVE-2012-5830 was published on 2012-11-21 and last updated on 2026-06-16.

References

• http://lists.opensuse.org/opensuse-security-announce/2012-11/msg00021.html
• http://lists.opensuse.org/opensuse-security-announce/2013-01/msg00022.html
• http://lists.opensuse.org/opensuse-updates/2012-11/msg00090.html
• http://lists.opensuse.org/opensuse-updates/2012-11/msg00092.html
• http://lists.opensuse.org/opensuse-updates/2012-11/msg00093.html
• http://osvdb.org/87598
• http://rhn.redhat.com/errata/RHSA-2012-1482.html
• http://rhn.redhat.com/errata/RHSA-2012-1483.html
• http://secunia.com/advisories/51359
• http://secunia.com/advisories/51360
• http://secunia.com/advisories/51369
• http://secunia.com/advisories/51370
• http://secunia.com/advisories/51381
• http://secunia.com/advisories/51434
• http://secunia.com/advisories/51439
• http://secunia.com/advisories/51440
• http://www.mozilla.org/security/announce/2012/mfsa2012-106.html
• http://www.ubuntu.com/usn/USN-1636-1
• http://www.ubuntu.com/usn/USN-1638-1
• http://www.ubuntu.com/usn/USN-1638-2
• http://www.ubuntu.com/usn/USN-1638-3
• https://bugzilla.mozilla.org/show_bug.cgi?id=775228
• https://exchange.xforce.ibmcloud.com/vulnerabilities/80183

Affected products (26)

• cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:*:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:thunderbird_esr:*:*:*:*:*:*:*:*
• cpe:2.3:o:redhat:enterprise_linux_desktop:5.0:*:*:*:*:*:*:*
• cpe:2.3:o:redhat:enterprise_linux_desktop:6.0:*:*:*:*:*:*:*
• cpe:2.3:o:redhat:enterprise_linux_eus:6.3:*:*:*:*:*:*:*
• cpe:2.3:o:redhat:enterprise_linux_server:5.0:*:*:*:*:*:*:*
• cpe:2.3:o:redhat:enterprise_linux_server:6.0:*:*:*:*:*:*:*
• cpe:2.3:o:redhat:enterprise_linux_server_eus:6.3:*:*:*:*:*:*:*
• cpe:2.3:o:redhat:enterprise_linux_workstation:5.0:*:*:*:*:*:*:*
• cpe:2.3:o:redhat:enterprise_linux_workstation:6.0:*:*:*:*:*:*:*
• cpe:2.3:a:suse:suse_linux_enterprise_software_development_kit:11.0:sp2:*:*:*:*:*:*
• cpe:2.3:o:canonical:ubuntu_linux:10.04:*:*:*:-:*:*:*
• cpe:2.3:o:canonical:ubuntu_linux:11.10:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:esm:*:*:*
• cpe:2.3:o:canonical:ubuntu_linux:12.10:*:*:*:*:*:*:*
• cpe:2.3:o:opensuse:opensuse:11.4:*:*:*:*:*:*:*
• cpe:2.3:o:opensuse:opensuse:12.1:*:*:*:*:*:*:*
• cpe:2.3:o:opensuse:opensuse:12.2:*:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_linux_enterprise_desktop:10:sp4:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_linux_enterprise_desktop:11:sp2:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_linux_enterprise_server:10:sp4:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_linux_enterprise_server:11:sp2:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_linux_enterprise_server:11:sp2:*:*:*:-:*:*
• cpe:2.3:o:suse:suse_linux_enterprise_server:11:sp2:*:*:*:vmware:*:*

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Other CWE-416 (Use After Free) vulnerabilities

• CVE-2026-13782 — Critical (CVSS 10.0): Use after free in Browser in Google Chrome prior to 150.0.7871.47 allowed a remote attacker who had compromised the…
• CVE-2026-4725 — Critical (CVSS 10.0): Sandbox escape due to use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 149…
• CVE-2026-4688 — Critical (CVSS 10.0): Sandbox escape due to use-after-free in the Disability Access APIs component. This vulnerability was fixed in Firefox…
• CVE-2025-24085 — Critical (CVSS 10.0): A use after free issue was addressed with improved memory management. This issue is fixed in iOS 18.3 and iPadOS 18.3,…
• CVE-2024-43102 — Critical (CVSS 10.0): Concurrent removals of certain anonymous shared memory mappings by using the UMTX_SHM_DESTROY sub-request of…
• CVE-2021-32495 — Critical (CVSS 10.0): Radare2 has a use-after-free vulnerability in pyc parser's get_none_object function. Attacker can read freed memory…

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