Mozilla: Crash with invalid cast when using instanceof operator (MFSA 2012-80)
Published Oct 10, 2012
9.3
HIGHCVSS 2.0
EPSS 3.46%
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.
Affected products
No data.
Configuration 1
Configuration 2
- 10.04
- 11.04
- 11.10
- 12.04
Configuration 3
- 10
- 11
- 10
- 11
- 11
No data.
Red Hat Enterprise Linux 5
firefox
Not affected
Red Hat Enterprise Linux 5
thunderbird
Not affected
Red Hat Enterprise Linux 6
firefox
Not affected
Red Hat Enterprise Linux 6
thunderbird
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | firefox | Not affected | n/a |
| Red Hat Enterprise Linux 5 | thunderbird | Not affected | n/a |
| Red Hat Enterprise Linux 6 | firefox | Not affected | n/a |
| Red Hat Enterprise Linux 6 | thunderbird | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
Not Vulnerable. This issue does not affect the version of firefox and thunderbird as shipped with Red Hat Enterprise Linux 5 and 6.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
AV:N/AC:M/Au:N/C:C/I:C/A:C
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (12 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 3.46% (0.03464) | 88.66th | v5 (v2026.06.15) |
| Jun 15, 2026 | 3.46% (0.03464) | 87.48th | v5 (v2026.06.15) |
| Mar 30, 2025 | 0.61% (0.00612) | 67.32th | v4 (v2025.03.14) |
| Mar 29, 2025 | 2.25% (0.02249) | 74.25th | v4 (v2025.03.14) |
| Mar 17, 2025 | 0.75% (0.00754) | 71.49th | v4 (v2025.03.14) |
| Dec 12, 2024 | 1.86% (0.01856) | 88.84th | v3 (v2023.03.01) |
| Jul 14, 2024 | 1.77% (0.01772) | 88.18th | v3 (v2023.03.01) |
| Apr 28, 2023 | 1.77% (0.01772) | 86.18th | v3 (v2023.03.01) |
| Mar 7, 2023 | 1.48% (0.01477) | 84.71th | v3 (v2023.03.01) |
| Mar 6, 2023 | 5.65% (0.05647) | 90.25th | v2 (v2022.01.01) |
| Apr 1, 2022 | 5.65% (0.05647) | 89.30th | v2 (v2022.01.01) |
| Feb 4, 2022 | 5.65% (0.05647) | 76.85th | v2 (v2022.01.01) |
References (15)
- http://lists.opensuse.org/opensuse-security-announce/2012-10/msg00010.html vendor-advisoryx_refsource_SUSEMailing ListThird Party Advisory
- http://osvdb.org/86097 vdb-entryx_refsource_OSVDBBroken Link
- http://secunia.com/advisories/50856 third-party-advisoryx_refsource_SECUNIABroken Link
- http://secunia.com/advisories/50892 third-party-advisoryx_refsource_SECUNIABroken Link
- http://secunia.com/advisories/50904 third-party-advisoryx_refsource_SECUNIABroken Link
- http://secunia.com/advisories/50935 third-party-advisoryx_refsource_SECUNIABroken Link
- http://secunia.com/advisories/50984 third-party-advisoryx_refsource_SECUNIABroken Link
- http://www.mozilla.org/security/announce/2012/mfsa2012-80.html x_refsource_CONFIRMVendor Advisory
- http://www.ubuntu.com/usn/USN-1611-1 vendor-advisoryx_refsource_UBUNTUThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2012-3989 Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=783867 x_refsource_CONFIRMIssue TrackingVendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=863620 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2012-3989
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A16814 vdb-entrysignaturex_refsource_OVALThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2012-3989
Change history (0)
No recorded changes yet.