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CVE-2012-5843

32
FAUCET Score

CVE-2012-5843 describes multiple unspecified vulnerabilities within the browser engine of Mozilla Firefox before version 17.0, Thunderbird before 17.0, and SeaMonkey before 2.14. These flaws could be exploited by remote attackers to trigger a denial of service through memory corruption and application crashes, or potentially achieve arbitrary code execution. With a CVSS score of 9.3 (Critical), the vulnerability has a high severity, indicating network-based attacks with medium complexity and complete impact on confidentiality, integrity, and availability. Despite its high severity, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
< 10.0.11CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
< 17.0CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
< 2.14CPE matchmatch criteria
cpe:2.3:a:mozilla:seamonkey:*:*:*:*:*:*:*:*
< 17.0CPE matchmatch criteria
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
< 10.0.11CPE matchmatch criteria
cpe:2.3:a:mozilla:thunderbird_esr:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

9.3HIGH

AV:N/AC:M/Au:N/C:C/I:C/A:C

Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Exploitability Score
8.6
Impact Score
10.0
CvssVersion
2.0

Exploit Intelligence

EPSS Score
5.78%
Probability of exploitation in next 30 days
EPSS Percentile
92.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0578 is in the 64th percentile among its peer group of 8,918 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

mozillapatch availablevia nvd_reference
View patch

Vendor Advisories (1)

redhatCVE-2012-5843Critical

Mozilla: Miscellaneous memory safety hazards (rv:17.0) (MFSA 2012-91)

Nov 20, 2012

References

lists.opensuse.org / opensuse-security-announce/2012-11/msg00021.html
Mailing ListThird Party Advisory
lists.opensuse.org / opensuse-security-announce/2013-01/msg00022.html
Mailing ListThird Party Advisory
lists.opensuse.org / opensuse-updates/2012-11/msg00090.html
Mailing ListThird Party Advisory
lists.opensuse.org / opensuse-updates/2012-11/msg00092.html
Mailing ListThird Party Advisory
lists.opensuse.org / opensuse-updates/2012-11/msg00093.html
Mailing ListThird Party Advisory
bugzilla.mozilla.org / show_bug.cgi
Issue TrackingVendor Advisory
bugzilla.mozilla.org / show_bug.cgi
Issue TrackingPatchVendor Advisory
bugzilla.mozilla.org / show_bug.cgi
Issue TrackingPatchVendor Advisory
bugzilla.mozilla.org / show_bug.cgi
Issue TrackingPatchVendor Advisory
bugzilla.mozilla.org / show_bug.cgi
ExploitIssue TrackingPatchVendor Advisory
bugzilla.mozilla.org / show_bug.cgi
Issue TrackingPatchVendor Advisory
bugzilla.mozilla.org / show_bug.cgi
Issue TrackingPatchVendor Advisory
bugzilla.mozilla.org / show_bug.cgi
ExploitIssue TrackingPatchVendor Advisory
bugzilla.mozilla.org / show_bug.cgi
Issue TrackingPatch
bugzilla.mozilla.org / show_bug.cgi
ExploitIssue TrackingPatchVendor Advisory
bugzilla.mozilla.org / show_bug.cgi
Issue TrackingPatchVendor Advisory
bugzilla.mozilla.org / show_bug.cgi
Issue TrackingPatchVendor Advisory
bugzilla.mozilla.org / show_bug.cgi
ExploitIssue TrackingVendor Advisory
bugzilla.mozilla.org / show_bug.cgi
Issue TrackingPatchVendor Advisory
secunia.com / advisories/51369
Third Party Advisory
secunia.com / advisories/51370
Third Party Advisory
secunia.com / advisories/51381
Third Party Advisory
secunia.com / advisories/51434
Third Party Advisory
secunia.com / advisories/51439
Third Party Advisory
secunia.com / advisories/51440
Third Party Advisory
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A16839
Third Party Advisory
mozilla.org / security/announce/2012/mfsa2012-91.html
Vendor Advisory
ubuntu.com / usn/USN-1636-1
Third Party Advisory
ubuntu.com / usn/USN-1638-1
Third Party Advisory
ubuntu.com / usn/USN-1638-2
Third Party Advisory
ubuntu.com / usn/USN-1638-3
Third Party Advisory