Mozilla: Use-after-free with Fetch API (MFSA 2017-22)
Published Jun 11, 2018
9.8
CRITICALCVSS 3.0
EPSS 2.31%
Description
A use-after-free vulnerability can occur in the Fetch API when the worker or the associated window are freed when still in use, resulting in a potentially exploitable crash. This vulnerability affects Firefox < 56, Firefox ESR < 52.4, and Thunderbird < 52.4.
Affected products
-
- Version unspecifiedStatusaffectedConstraints<56
- Version
-
- Version unspecifiedStatusaffectedConstraints<52.4
- Version
-
- Version unspecifiedStatusaffectedConstraints<52.4
- 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
- 7.0
- 8.0
- 9.0
Configuration 2
- 5.0
- 6.0
- 7.0
- 5.0
- 6.0
- 7.0
- 5.0
- 6.0
- 7.0
- 7.3
- 7.4
- 7.3
- 7.4
- 7.5
- 5.0
- 6.0
- 7.0
Configuration 3
- < 52.4.0
No data.
Red Hat Enterprise Linux 6
firefox-0:52.4.0-1.el6_9
Fixed · RHSA-2017:2831
Red Hat Enterprise Linux 6
thunderbird-0:52.4.0-2.el6_9
Fixed · RHSA-2017:2885
Red Hat Enterprise Linux 7
firefox-0:52.4.0-1.el7_4
Fixed · RHSA-2017:2831
Red Hat Enterprise Linux 7
thunderbird-0:52.4.0-2.el7_4
Fixed · RHSA-2017:2885
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 6 | firefox-0:52.4.0-1.el6_9 | Fixed | RHSA-2017:2831 |
| Red Hat Enterprise Linux 6 | thunderbird-0:52.4.0-2.el6_9 | Fixed | RHSA-2017:2885 |
| Red Hat Enterprise Linux 7 | firefox-0:52.4.0-1.el7_4 | Fixed | RHSA-2017:2831 |
| Red Hat Enterprise Linux 7 | thunderbird-0:52.4.0-2.el7_4 | Fixed | RHSA-2017:2885 |
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 v5
- EPSS v2
- EPSS v3
- EPSS v4
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Table of values (15 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 2.31% (0.02314) | 82.79th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.34% (0.02344) | 81.37th | v5 (v2026.06.15) |
| Mar 30, 2025 | 3.29% (0.03290) | 86.05th | v4 (v2025.03.14) |
| Mar 29, 2025 | 6.22% (0.06218) | 84.38th | v4 (v2025.03.14) |
| Mar 17, 2025 | 2.79% (0.02792) | 85.15th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.52% (0.00519) | 77.57th | v3 (v2023.03.01) |
| Feb 13, 2024 | 0.51% (0.00512) | 75.95th | v3 (v2023.03.01) |
| Dec 12, 2023 | 0.51% (0.00512) | 73.95th | v3 (v2023.03.01) |
| Nov 2, 2023 | 0.66% (0.00657) | 77.25th | v3 (v2023.03.01) |
| Sep 3, 2023 | 0.72% (0.00721) | 78.21th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.57% (0.00571) | 74.52th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.54% (0.01537) | 74.52th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.54% (0.01537) | 51.33th | v2 (v2022.01.01) |
| Feb 3, 2022 | 2.68% (0.02678) | 55.40th | v5 (v2026.06.15) |
| Apr 14, 2021 | 2.68% (0.02678) | 0.00th | v1 |
References (17)
- http://www.securityfocus.com/bid/101055 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1039465 vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
- https://access.redhat.com/errata/RHSA-2017:2831 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/errata/RHSA-2017:2885 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2017-7793 Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1371889 x_refsource_CONFIRMIssue TrackingPatchVendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1496649 Issue Tracking
- https://lists.debian.org/debian-lts-announce/2017/11/msg00000.html mailing-listx_refsource_MLISTThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2017-7793
- https://security.gentoo.org/glsa/201803-14 vendor-advisoryx_refsource_GENTOOThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2017-7793
- https://www.debian.org/security/2017/dsa-3987 vendor-advisoryx_refsource_DEBIANThird Party Advisory
- https://www.debian.org/security/2017/dsa-4014 vendor-advisoryx_refsource_DEBIANThird Party Advisory
- https://www.mozilla.org/en-US/security/advisories/mfsa2017-22/#CVE-2017-7793
- https://www.mozilla.org/security/advisories/mfsa2017-21/ x_refsource_CONFIRMVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2017-22/ x_refsource_CONFIRMVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2017-23/ x_refsource_CONFIRMVendor Advisory
Change history (0)
No recorded changes yet.