Mozilla: Crash with JavaScript variable assignment with unboxed objects (MFSA 2015-135)
Published Dec 16, 2015
6.8
MEDIUMCVSS 2.0
EPSS 3.49%
Description
Mozilla Firefox before 43.0 does not properly store the properties of unboxed objects, which allows remote attackers to execute arbitrary code via crafted JavaScript variable assignments.
Affected products
No data.
Configuration 2
- 22
- 23
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
Red Hat Enterprise Linux 7
firefox
Not affected
Red Hat Enterprise Linux 7
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 |
| Red Hat Enterprise Linux 7 | firefox | Not affected | n/a |
| Red Hat Enterprise Linux 7 | thunderbird | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
This issue does not affect the version of firefox and thunderbird as shipped with Red Hat Enterprise Linux 5, 6 and 7.
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:P/I:P/A:P
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 | 3.49% (0.03492) | 88.76th | v5 (v2026.06.15) |
| Jun 15, 2026 | 3.49% (0.03492) | 87.59th | v5 (v2026.06.15) |
| Mar 30, 2025 | 1.55% (0.01547) | 79.68th | v4 (v2025.03.14) |
| Mar 29, 2025 | 3.97% (0.03971) | 80.36th | v4 (v2025.03.14) |
| Mar 17, 2025 | 1.55% (0.01547) | 80.11th | v4 (v2025.03.14) |
| Dec 12, 2024 | 3.79% (0.03785) | 92.19th | v3 (v2023.03.01) |
| Jan 15, 2024 | 3.61% (0.03608) | 90.73th | v3 (v2023.03.01) |
| Aug 3, 2023 | 3.53% (0.03529) | 90.32th | v3 (v2023.03.01) |
| Mar 7, 2023 | 3.26% (0.03261) | 89.73th | v3 (v2023.03.01) |
| Mar 6, 2023 | 9.92% (0.09915) | 94.52th | v2 (v2022.01.01) |
| Apr 1, 2022 | 9.92% (0.09915) | 94.04th | v2 (v2022.01.01) |
| Feb 4, 2022 | 9.92% (0.09915) | 87.53th | v2 (v2022.01.01) |
References (16)
- http://lists.fedoraproject.org/pipermail/package-announce/2015-December/174083.html vendor-advisoryx_refsource_FEDORA
- http://lists.fedoraproject.org/pipermail/package-announce/2015-December/174253.html vendor-advisoryx_refsource_FEDORA
- http://lists.opensuse.org/opensuse-updates/2015-12/msg00104.html vendor-advisoryx_refsource_SUSE
- http://lists.opensuse.org/opensuse-updates/2016-02/msg00007.html vendor-advisoryx_refsource_SUSE
- http://lists.opensuse.org/opensuse-updates/2016-02/msg00008.html vendor-advisoryx_refsource_SUSE
- http://www.mozilla.org/security/announce/2015/mfsa2015-135.html x_refsource_CONFIRMVendor Advisory
- http://www.securityfocus.com/bid/79280 vdb-entryx_refsource_BID
- http://www.securitytracker.com/id/1034426 vdb-entryx_refsource_SECTRACK
- http://www.ubuntu.com/usn/USN-2833-1 vendor-advisoryx_refsource_UBUNTU
- https://access.redhat.com/security/cve/CVE-2015-7204 Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1216130 x_refsource_CONFIRM
- https://bugzilla.redhat.com/show_bug.cgi?id=1291578 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2015-7204
- https://security.gentoo.org/glsa/201512-10 vendor-advisoryx_refsource_GENTOO
- https://www.cve.org/CVERecord?id=CVE-2015-7204
- https://www.mozilla.org/security/announce/2015/mfsa2015-135.html
Change history (0)
No recorded changes yet.