CVE-2012-3989
Mozilla Firefox before 16.0, Thunderbird before 16.0, and SeaMonkey before 2.13 do not properly perform a cast of an unspecified variable during use of the instanceof operator on a JavaScript object, which allows remote attackers to execute arbitrary…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (3.46%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
Mozilla Firefox before 16.0, Thunderbird before 16.0, and SeaMonkey before 2.13 do not properly perform a cast of an unspecified variable during use of the instanceof operator on a JavaScript object, which allows remote attackers to execute arbitrary code or cause a denial of service (assertion failure) via a crafted web site.
- CVSS 2.0
- 9.3 HIGHAV:N/AC:M/Au:N/C:C/I:C/A:C
- EPSS
- 3.46% probability · 89th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-119
- Affected
- mozilla/firefox · mozilla/seamonkey · mozilla/thunderbird · canonical/ubuntu linux · suse/linux enterprise desktop · suse/linux enterprise server
- Source
- cve@mitre.org
EPSS 3.5% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://lists.opensuse.org/opensuse-security-announce/2012-10/msg00010.htmlMailing List, Third Party Advisory
- http://osvdb.org/86097Broken Link
- http://secunia.com/advisories/50856Broken Link
- http://secunia.com/advisories/50892Broken Link
- http://secunia.com/advisories/50904Broken Link
- http://secunia.com/advisories/50935Broken Link
- http://secunia.com/advisories/50984Broken Link
- http://www.mozilla.org/security/announce/2012/mfsa2012-80.htmlVendor Advisory
- http://www.ubuntu.com/usn/USN-1611-1Third Party Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=783867Issue Tracking, Vendor Advisory
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A16814Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2012-10/msg00010.htmlMailing List, Third Party Advisory
- http://osvdb.org/86097Broken Link
- http://secunia.com/advisories/50856Broken Link
- http://secunia.com/advisories/50892Broken Link
- http://secunia.com/advisories/50904Broken Link
- http://secunia.com/advisories/50935Broken Link
- http://secunia.com/advisories/50984Broken Link
- http://www.mozilla.org/security/announce/2012/mfsa2012-80.htmlVendor Advisory
- http://www.ubuntu.com/usn/USN-1611-1Third Party Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=783867Issue Tracking, Vendor Advisory
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A16814Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.