Mozilla: Use-after-free during focus handling (MFSA 2017-11, MFSA 2017-12)
Published Jun 11, 2018
9.8
CRITICALCVSS 3.0
EPSS 3.57%
Description
A use-after-free vulnerability occurs when redirecting focus handling which results in a potentially exploitable crash. This vulnerability affects Thunderbird < 52.1, Firefox ESR < 45.9, Firefox ESR < 52.1, and Firefox < 53.
Affected products
-
- Version unspecifiedStatusaffectedConstraints<53
- Version
-
- Version unspecifiedStatusaffectedConstraints<45.9
- Version unspecifiedStatusaffectedConstraints<52.1
- Version
-
- Version unspecifiedStatusaffectedConstraints<52.1
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mozilla | Firefox | n/a |
| |||||||||
| Mozilla | Firefox ESR | n/a |
| |||||||||
| Mozilla | Thunderbird | n/a |
|
Configuration 1
- 6.0
- 7.0
- 6.0
- 7.0
- 6.0
- 7.0
Configuration 2
- 8.0
No data.
Red Hat Enterprise Linux 6
firefox-0:52.1.0-2.el6_9
Fixed · RHSA-2017:1104
Red Hat Enterprise Linux 6
thunderbird-0:52.1.0-1.el6_9
Fixed · RHSA-2017:1201
Red Hat Enterprise Linux 7
firefox-0:52.1.0-2.el7_3
Fixed · RHSA-2017:1106
Red Hat Enterprise Linux 7
thunderbird-0:52.1.0-1.el7_3
Fixed · RHSA-2017:1201
Red Hat Enterprise Linux 5
firefox
Will not fix
Red Hat Enterprise Linux 5
thunderbird
Will not fix
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 6 | firefox-0:52.1.0-2.el6_9 | Fixed | RHSA-2017:1104 |
| Red Hat Enterprise Linux 6 | thunderbird-0:52.1.0-1.el6_9 | Fixed | RHSA-2017:1201 |
| Red Hat Enterprise Linux 7 | firefox-0:52.1.0-2.el7_3 | Fixed | RHSA-2017:1106 |
| Red Hat Enterprise Linux 7 | thunderbird-0:52.1.0-1.el7_3 | Fixed | RHSA-2017:1201 |
| Red Hat Enterprise Linux 5 | firefox | Will not fix | n/a |
| Red Hat Enterprise Linux 5 | thunderbird | Will not fix | 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.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
AV:N/AC:L/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
2021–2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (20 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 3.57% (0.03575) | 89.02th | v5 (v2026.06.15) |
| Jun 15, 2026 | 3.65% (0.03652) | 88.12th | v5 (v2026.06.15) |
| Aug 20, 2025 | 2.02% (0.02016) | 82.98th | v4 (v2025.03.14) |
| Mar 30, 2025 | 3.69% (0.03688) | 86.83th | v4 (v2025.03.14) |
| Mar 29, 2025 | 6.94% (0.06938) | 85.36th | v4 (v2025.03.14) |
| Mar 17, 2025 | 3.76% (0.03757) | 87.25th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.89% (0.00889) | 83.29th | v3 (v2023.03.01) |
| Jun 21, 2024 | 0.88% (0.00877) | 82.56th | v3 (v2023.03.01) |
| Dec 12, 2023 | 0.88% (0.00877) | 80.55th | v3 (v2023.03.01) |
| Nov 2, 2023 | 1.04% (0.01040) | 82.33th | v3 (v2023.03.01) |
| Jun 5, 2023 | 0.76% (0.00760) | 78.55th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.64% (0.00639) | 75.96th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.54% (0.01537) | 74.52th | v2 (v2022.01.01) |
| Feb 23, 2023 | 1.54% (0.01537) | 74.48th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.54% (0.01537) | 72.41th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.54% (0.01537) | 51.33th | v2 (v2022.01.01) |
| Feb 3, 2022 | 2.48% (0.02476) | 54.92th | v1 |
| Jan 6, 2022 | 2.48% (0.02476) | 54.49th | v1 |
| Sep 1, 2021 | 2.48% (0.02476) | 78.74th | v1 |
| Apr 14, 2021 | 2.48% (0.02476) | 0.00th | v1 |
References (16)
- http://www.securityfocus.com/bid/97940 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1038320 vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
- https://access.redhat.com/errata/RHSA-2017:1104 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/errata/RHSA-2017:1106 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/errata/RHSA-2017:1201 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2017-5434 Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1349946 x_refsource_CONFIRMExploitIssue Tracking
- https://bugzilla.redhat.com/show_bug.cgi?id=1443329 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2017-5434
- https://www.cve.org/CVERecord?id=CVE-2017-5434
- https://www.debian.org/security/2017/dsa-3831 vendor-advisoryx_refsource_DEBIANThird Party Advisory
- https://www.mozilla.org/en-US/security/advisories/mfsa2017-11/#CVE-2017-5434
- https://www.mozilla.org/security/advisories/mfsa2017-10/ x_refsource_CONFIRMVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2017-11/ x_refsource_CONFIRMVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2017-12/ x_refsource_CONFIRMVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2017-13/ x_refsource_CONFIRMVendor Advisory
Change history (0)
No recorded changes yet.