Mozilla: Use-after-free in Content Policy due to microtask execution error (MFSA 2015-63)
Published Jul 6, 2015
10.0
HIGHCVSS 2.0
EPSS 5.79%
Description
Use-after-free vulnerability in the CSPService::ShouldLoad function in the microtask implementation in Mozilla Firefox before 39.0, Firefox ESR 38.x before 38.1, and Thunderbird before 38.1 allows remote attackers to execute arbitrary code by leveraging client-side JavaScript that triggers removal of a DOM object on the basis of a Content Policy.
Affected products
No data.
Configuration 2
- ≤ 38.0.1
Configuration 4
- 31.0
- 31.1.0
- 31.1.1
- 31.3.0
- 31.5.1
- 31.5.2
- 31.5.3
- 38.0
- 31.1
- 31.2
- 31.3
- 31.4
- 31.5
- 31.6.0
- 31.7.0
No data.
Red Hat Enterprise Linux 5
firefox-0:38.1.0-1.el5_11
Fixed · RHSA-2015:1207
Red Hat Enterprise Linux 5
thunderbird-0:31.8.0-1.el5_11
Fixed · RHSA-2015:1455
Red Hat Enterprise Linux 6
firefox-0:38.1.0-1.el6_6
Fixed · RHSA-2015:1207
Red Hat Enterprise Linux 6
thunderbird-0:31.8.0-1.el6_6
Fixed · RHSA-2015:1455
Red Hat Enterprise Linux 7
firefox-0:38.1.0-1.ael7b_1
Fixed · RHSA-2015:1207
Red Hat Enterprise Linux 7
thunderbird-0:31.8.0-1.ael7b_1
Fixed · RHSA-2015:1455
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | firefox-0:38.1.0-1.el5_11 | Fixed | RHSA-2015:1207 |
| Red Hat Enterprise Linux 5 | thunderbird-0:31.8.0-1.el5_11 | Fixed | RHSA-2015:1455 |
| Red Hat Enterprise Linux 6 | firefox-0:38.1.0-1.el6_6 | Fixed | RHSA-2015:1207 |
| Red Hat Enterprise Linux 6 | thunderbird-0:31.8.0-1.el6_6 | Fixed | RHSA-2015:1455 |
| Red Hat Enterprise Linux 7 | firefox-0:38.1.0-1.ael7b_1 | Fixed | RHSA-2015:1207 |
| Red Hat Enterprise Linux 7 | thunderbird-0:31.8.0-1.ael7b_1 | Fixed | RHSA-2015:1455 |
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:L/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 (14 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 5.79% (0.05787) | 92.87th | v5 (v2026.06.15) |
| Jun 15, 2026 | 5.79% (0.05787) | 92.10th | v5 (v2026.06.15) |
| Dec 7, 2025 | 0.95% (0.00945) | 75.57th | v4 (v2025.03.14) |
| Mar 30, 2025 | 2.30% (0.02298) | 83.27th | v4 (v2025.03.14) |
| Mar 29, 2025 | 5.62% (0.05620) | 83.48th | v4 (v2025.03.14) |
| Mar 17, 2025 | 2.30% (0.02298) | 83.58th | v4 (v2025.03.14) |
| Dec 12, 2024 | 4.36% (0.04362) | 92.67th | v3 (v2023.03.01) |
| Mar 12, 2024 | 4.36% (0.04362) | 92.11th | v3 (v2023.03.01) |
| Aug 4, 2023 | 2.94% (0.02940) | 89.49th | v3 (v2023.03.01) |
| Apr 27, 2023 | 2.88% (0.02875) | 89.20th | v3 (v2023.03.01) |
| Mar 7, 2023 | 2.24% (0.02238) | 87.76th | v3 (v2023.03.01) |
| Mar 6, 2023 | 12.25% (0.12248) | 95.30th | v2 (v2022.01.01) |
| Apr 1, 2022 | 12.25% (0.12248) | 94.93th | v2 (v2022.01.01) |
| Feb 4, 2022 | 12.25% (0.12248) | 89.34th | v2 (v2022.01.01) |
References (18)
- http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00025.html vendor-advisoryx_refsource_SUSE
- http://rhn.redhat.com/errata/RHSA-2015-1207.html vendor-advisoryx_refsource_REDHAT
- http://rhn.redhat.com/errata/RHSA-2015-1455.html vendor-advisoryx_refsource_REDHAT
- http://www.debian.org/security/2015/dsa-3300 vendor-advisoryx_refsource_DEBIAN
- http://www.mozilla.org/security/announce/2015/mfsa2015-63.html x_refsource_CONFIRMVendor Advisory
- http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html x_refsource_CONFIRMThird Party Advisory
- http://www.oracle.com/technetwork/topics/security/bulletinoct2015-2511968.html x_refsource_CONFIRMThird Party Advisory
- http://www.securityfocus.com/bid/75541 vdb-entryx_refsource_BID
- http://www.securitytracker.com/id/1032783 vdb-entryx_refsource_SECTRACK
- http://www.securitytracker.com/id/1032784 vdb-entryx_refsource_SECTRACK
- http://www.ubuntu.com/usn/USN-2656-1 vendor-advisoryx_refsource_UBUNTU
- http://www.ubuntu.com/usn/USN-2656-2 vendor-advisoryx_refsource_UBUNTU
- https://access.redhat.com/security/cve/CVE-2015-2731 Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1149891 x_refsource_CONFIRMIssue Tracking
- https://bugzilla.redhat.com/show_bug.cgi?id=1236953 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2015-2731
- https://security.gentoo.org/glsa/201512-10 vendor-advisoryx_refsource_GENTOO
- https://www.cve.org/CVERecord?id=CVE-2015-2731
Change history (0)
No recorded changes yet.