No exploitation reportedFix available

CVE-2012-5830

Q: Is CVE-2012-5830 actively exploited?

Active exploitation of CVE-2012-5830 has not been confirmed. Its EPSS score was 3.8% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2012-5830?

CVE-2012-5830 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

No exploitation reported by the sources we read.

Published2012-11-21
WeaknessCWE-416

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC

2012-11-2112:55CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2012-5830?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2012-5830?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Canonical ubuntu linux

Branch	Affected	Fixed in	Source
10.4	= 10.04	no fix published	NVD
11.10	= 11.10	no fix published	NVD
12.4	= 12.04	no fix published	NVD
12.10	= 12.10	no fix published	NVD

Opensuse

Branch	Affected	Fixed in	Source
11.4	= 11.4	no fix published	NVD
12.1	= 12.1	no fix published	NVD
12.2	= 12.2	no fix published	NVD

Mozilla firefoxversion to verify

Branch	Affected	Fixed in	Source
17.0	< 17.0	17.0	NVD
10.0	≥ 10.0, < 10.0.11	10.0.11	NVD

11 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Advisories and patches

www.mozilla.orgVendor Advisory
bugzilla.mozilla.orgVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.18.8read 2026-10-23
NVDCVSS 2.06.8read 2026-10-23
NVDweakness (CWE)CWE-416read 2026-10-23
FIRST EPSSEPSS score3.8 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published: 2012-11-21
Last Modified: 2026-06-16
NVD status: Modified

Frequently asked questions

What is CVE-2012-5830?

Is CVE-2012-5830 actively exploited?

Active exploitation of CVE-2012-5830 has not been confirmed. Its EPSS score was 3.8% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2012-5830?

CVE-2012-5830 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

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