Mozilla: JavaScript immutable property enforcement can be bypassed (MFSA 2015-109)
Published Sep 24, 2015
9.3
HIGHCVSS 2.0
EPSS 3.46%
Description
Mozilla Firefox before 41.0 allows remote attackers to bypass certain ECMAScript 5 (aka ES5) API protection mechanisms and modify immutable properties, and consequently execute arbitrary JavaScript code with chrome privileges, via a crafted web page that does not use ES5 APIs.
Affected products
No data.
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
No remediation recorded yet.
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% (0.03456) | 88.64th | v5 (v2026.06.15) |
| Jun 15, 2026 | 3.46% (0.03456) | 87.45th | v5 (v2026.06.15) |
| Mar 30, 2025 | 1.67% (0.01673) | 80.44th | v4 (v2025.03.14) |
| Mar 29, 2025 | 2.99% (0.02989) | 77.54th | v4 (v2025.03.14) |
| Mar 17, 2025 | 1.67% (0.01673) | 80.87th | v4 (v2025.03.14) |
| Dec 12, 2024 | 1.10% (0.01103) | 85.10th | v3 (v2023.03.01) |
| May 3, 2024 | 1.10% (0.01103) | 84.37th | v3 (v2023.03.01) |
| May 11, 2023 | 1.10% (0.01103) | 82.33th | v3 (v2023.03.01) |
| Mar 7, 2023 | 1.02% (0.01017) | 81.44th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.96% (0.01955) | 78.47th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.96% (0.01955) | 76.59th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.96% (0.01955) | 55.71th | v2 (v2022.01.01) |
References (16)
- http://lists.opensuse.org/opensuse-security-announce/2015-10/msg00000.html vendor-advisoryx_refsource_SUSE
- http://lists.opensuse.org/opensuse-security-announce/2015-10/msg00005.html vendor-advisoryx_refsource_SUSE
- http://www.mozilla.org/security/announce/2015/mfsa2015-109.html x_refsource_CONFIRMVendor Advisory
- http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html x_refsource_CONFIRM
- http://www.securityfocus.com/bid/76815 vdb-entryx_refsource_BID
- http://www.securitytracker.com/id/1033640 vdb-entryx_refsource_SECTRACK
- http://www.ubuntu.com/usn/USN-2743-1 vendor-advisoryx_refsource_UBUNTU
- http://www.ubuntu.com/usn/USN-2743-2 vendor-advisoryx_refsource_UBUNTU
- http://www.ubuntu.com/usn/USN-2743-3 vendor-advisoryx_refsource_UBUNTU
- http://www.ubuntu.com/usn/USN-2743-4 vendor-advisoryx_refsource_UBUNTU
- https://access.redhat.com/security/cve/CVE-2015-4516 Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=904886 x_refsource_CONFIRM
- https://bugzilla.redhat.com/show_bug.cgi?id=1265775 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2015-4516
- https://www.cve.org/CVERecord?id=CVE-2015-4516
- https://www.mozilla.org/en-US/security/advisories/mfsa2015-109/
Change history (0)
No recorded changes yet.