Mozilla: Web worker in Private Browsing mode can write IndexedDB data
Published Jun 11, 2018
7.5
HIGHCVSS 3.0
EPSS 2.95%
Description
When Private Browsing mode is used, it is possible for a web worker to write persistent data to IndexedDB and fingerprint a user uniquely. IndexedDB should not be available in Private Browsing mode and this stored data will persist across multiple private browsing mode sessions because it is not cleared when exiting. This vulnerability affects Firefox ESR < 52.5.2 and Firefox < 57.0.1.
Affected products
-
- Version unspecifiedStatusaffectedConstraints<57.0.1
- Version
-
- Version unspecifiedStatusaffectedConstraints<52.5.2
- 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 |
|
Configuration 1
- 7.0
- 8.0
- 9.0
Configuration 4
- 6.0
- 7.0
- 6.0
- 7.0
- 7.4
- 7.4
- 7.5
- 6.0
- 7.0
No data.
Red Hat Enterprise Linux 6
firefox-0:52.5.1-1.el6_9
Fixed · RHSA-2017:3382
Red Hat Enterprise Linux 7
firefox-0:52.5.1-1.el7_4
Fixed · RHSA-2017:3382
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 6 | firefox-0:52.5.1-1.el6_9 | Fixed | RHSA-2017:3382 |
| Red Hat Enterprise Linux 7 | firefox-0:52.5.1-1.el7_4 | Fixed | RHSA-2017:3382 |
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:N/A:N
AV:N/AC:L/Au:N/C:P/I:N/A:N
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 | 2.95% (0.02951) | 86.69th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.99% (0.02989) | 85.52th | v5 (v2026.06.15) |
| Mar 30, 2025 | 1.16% (0.01158) | 76.63th | v4 (v2025.03.14) |
| Mar 29, 2025 | 2.97% (0.02969) | 77.48th | v4 (v2025.03.14) |
| Mar 17, 2025 | 1.60% (0.01596) | 80.41th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.40% (0.00396) | 74.33th | v3 (v2023.03.01) |
| Feb 29, 2024 | 0.55% (0.00554) | 77.01th | v3 (v2023.03.01) |
| Dec 12, 2023 | 0.55% (0.00554) | 75.00th | v3 (v2023.03.01) |
| Nov 2, 2023 | 0.66% (0.00657) | 77.25th | v3 (v2023.03.01) |
| Sep 3, 2023 | 0.80% (0.00797) | 79.45th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.86% (0.00860) | 79.76th | 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 | 2.20% (0.02196) | 50.61th | v5 (v2026.06.15) |
| Apr 14, 2021 | 2.20% (0.02196) | 0.00th | v1 |
References (14)
- http://www.securityfocus.com/bid/102039 vdb-entryx_refsource_BIDIssue TrackingThird Party AdvisoryVDB Entry
- http://www.securityfocus.com/bid/102112 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1039954 vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
- https://access.redhat.com/errata/RHSA-2017:3382 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2017-7843 Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1410106 x_refsource_CONFIRMExploitIssue TrackingThird Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1518566 Issue Tracking
- https://lists.debian.org/debian-lts-announce/2017/12/msg00003.html mailing-listx_refsource_MLISTThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2017-7843
- https://www.cve.org/CVERecord?id=CVE-2017-7843
- https://www.debian.org/security/2017/dsa-4062 vendor-advisoryx_refsource_DEBIANThird Party Advisory
- https://www.mozilla.org/en-US/security/advisories/mfsa2017-27/#CVE-2017-7843
- https://www.mozilla.org/security/advisories/mfsa2017-27/ x_refsource_CONFIRMVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2017-28/ x_refsource_CONFIRMVendor Advisory
Change history (0)
No recorded changes yet.