CVE-2017-7843

Name: CVE-2017-7843
Creator: NVD / NIST
Published: 2018-06-11T21:29:11.92+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 2.99%

Last modified Jun 17, 2026

CVE-2017-7843 is a vulnerability of currently unknown severity. 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. EPSS estimates a 2.99% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability

2.99%

85.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-200

Affected Software

Vendor	Product	Versions
Debian	Debian Linux	7.0
Debian	Debian Linux	8.0
Debian	Debian Linux	9.0
Mozilla	Firefox	< 57.0.1
Mozilla	Firefox	< 52.5.2
Redhat	Enterprise Linux Desktop	6.0
Redhat	Enterprise Linux Desktop	7.0
Redhat	Enterprise Linux Server	6.0
Redhat	Enterprise Linux Server	7.0
Redhat	Enterprise Linux Server Aus	7.4
Redhat	Enterprise Linux Server Eus	7.4
Redhat	Enterprise Linux Server Eus	7.5
Redhat	Enterprise Linux Workstation	6.0
Redhat	Enterprise Linux Workstation	7.0

References

http://www.securityfocus.com/bid/102039Issue Tracking, Third Party Advisory, VDB Entry
http://www.securityfocus.com/bid/102112Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1039954Third Party Advisory, VDB Entry
https://access.redhat.com/errata/RHSA-2017:3382Third Party Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1410106Exploit, Issue Tracking, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2017/12/msg00003.htmlThird Party Advisory
https://www.debian.org/security/2017/dsa-4062Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2017-27/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2017-28/Vendor Advisory
http://www.securityfocus.com/bid/102039Issue Tracking, Third Party Advisory, VDB Entry
http://www.securityfocus.com/bid/102112Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1039954Third Party Advisory, VDB Entry
https://access.redhat.com/errata/RHSA-2017:3382Third Party Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1410106Exploit, Issue Tracking, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2017/12/msg00003.htmlThird Party Advisory
https://www.debian.org/security/2017/dsa-4062Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2017-27/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2017-28/Vendor Advisory

Timeline

Published: Jun 11, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2017-7843?

How severe is CVE-2017-7843?

Severity scoring for CVE-2017-7843 is pending analysis. The EPSS model estimates a 2.99% probability of exploitation in the next 30 days.

How do I fix CVE-2017-7843?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2017-7843?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST