Mozilla: Chrome Object Wrapper (COW) bypass through changing prototype (MFSA 2013-14)
Published Jan 13, 2013
9.3
HIGHCVSS 2.0
EPSS 60.86%
Description
The Chrome Object Wrapper (COW) implementation in Mozilla Firefox before 18.0, Firefox ESR 17.x before 17.0.2, Thunderbird before 17.0.2, Thunderbird ESR 17.x before 17.0.2, and SeaMonkey before 2.15 does not prevent modifications to the prototype of an object, which allows remote attackers to execute arbitrary JavaScript code with chrome privileges by referencing Object.prototype.__proto__ in a crafted HTML document.
Affected products
No data.
Configuration 1
- < 17.0.2
- < 18.0
- < 2.15
- < 17.0.2
- < 17.0.2
Configuration 2
- 11.4
- 12.1
- 12.2
- 10
- 11
- 10
- 11
- 11
- 10
- 11
Configuration 3
- 10.04
- 11.10
- 12.04
- 12.10
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 | 60.86% (0.60859) | 99.13th | v5 (v2026.06.15) |
| Jun 15, 2026 | 60.86% (0.60859) | 99.03th | v5 (v2026.06.15) |
| Mar 30, 2025 | 74.57% (0.74572) | 98.78th | v4 (v2025.03.14) |
| Mar 29, 2025 | 81.19% (0.81195) | 98.93th | v4 (v2025.03.14) |
| Mar 17, 2025 | 74.57% (0.74572) | 98.78th | v4 (v2025.03.14) |
| Dec 17, 2024 | 3.60% (0.03603) | 91.52th | v3 (v2023.03.01) |
| Apr 8, 2024 | 9.47% (0.09475) | 94.63th | v3 (v2023.03.01) |
| Dec 4, 2023 | 6.92% (0.06921) | 93.20th | v3 (v2023.03.01) |
| Mar 7, 2023 | 9.18% (0.09182) | 93.65th | 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 (14)
- http://lists.opensuse.org/opensuse-security-announce/2013-01/msg00006.html vendor-advisoryx_refsource_SUSEThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2013-01/msg00007.html vendor-advisoryx_refsource_SUSEThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2013-01/msg00010.html vendor-advisoryx_refsource_SUSEThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2013-01/msg00017.html vendor-advisoryx_refsource_SUSEThird Party Advisory
- http://www.mozilla.org/security/announce/2013/mfsa2013-14.html x_refsource_CONFIRMVendor Advisory
- http://www.ubuntu.com/usn/USN-1681-1 vendor-advisoryx_refsource_UBUNTUThird Party Advisory
- http://www.ubuntu.com/usn/USN-1681-2 vendor-advisoryx_refsource_UBUNTUThird Party Advisory
- http://www.ubuntu.com/usn/USN-1681-4 vendor-advisoryx_refsource_UBUNTUThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2013-0757 Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=813901 x_refsource_CONFIRMExploitIssue TrackingPatchVendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=892147 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2013-0757
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A16939 vdb-entrysignaturex_refsource_OVALThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2013-0757
Change history (0)
No recorded changes yet.