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Fencer Intel
high 7.5

CVE-2017-5378 json

Hashed codes of JavaScript objects are shared between pages.

published 2018-06-11 8 y ago modified 2026-06-17 4 mo ago also EUVD-2017-14482

cvss
7.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.3%
EPSS 3.3% chance of exploitation in 30 days, percentile 88%
public exploits
0
none known

Summary

Hashed codes of JavaScript objects are shared between pages. This allows for pointer leaks because an object's address can be discovered through hash codes, and also allows for data leakage of an object's content using these hash codes. This vulnerability affects Thunderbird < 45.7, Firefox ESR < 45.7, and Firefox < 51.

Patch / fix

  • Mozilla Thunderbird 45.7
  • Mozilla Firefox ESR 45.7
  • Mozilla Firefox 51
  • firefox-esr Debian 14, Debian 13, Debian 12 45.7.0esr-1

debian advisories DEBIAN-CVE-2017-5378

  • firefox Ubuntu 14.04 LTS 51.0.1+build2-0ubuntu0.14.04.1
  • firefox Ubuntu 16.04 LTS 51.0.1+build2-0ubuntu0.16.04.1
  • thunderbird Ubuntu 14.04 LTS 1:45.7.0+build1-0ubuntu0.14.04.1
  • thunderbird Ubuntu 16.04 LTS 1:45.7.0+build1-0ubuntu0.16.04.1

ubuntu advisories UBUNTU-CVE-2017-5378

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • thunderbird RHEL 5 PRODUCTIVITY, RHEL 5 45.7.0-1.el5_11
  • thunderbird RHEL 6 45.7.0-1.el6_8
  • thunderbird RHEL 7 45.7.0-1.el7_3
  • firefox RHEL 5 45.7.0-2.el5_11
  • firefox RHEL 6 45.7.0-2.el6_8
  • firefox RHEL 7 45.7.0-2.el7_3

red hat advisories RHSA-2017:0238RHSA-2017:0190

  • MozillaFirefox SLES for SAP 12 SP2, SLES for SAP 12 SP1, SLES for SAP 12 +8 more 45.7.0esr-99.1
  • MozillaFirefox SLES for SAP 11 SP4, SLES 11 SP4, SLES 11 SP3-TERADATA +6 more 45.7.0esr-65.2

suse advisories SUSE-SU-2017:0427-1SUSE-SU-2017:0426-1

  • firefox-esr openSUSE Tumbleweed 128.5.1-1.1
  • MozillaFirefox openSUSE Tumbleweed 92.0-1.2
  • MozillaThunderbird openSUSE Tumbleweed 91.1.1-1.1
  • MozillaThunderbird Package Hub 12 45.7.0-23.1

opensuse advisories openSUSE-SU-2024:14572-1openSUSE-SU-2024:10600-1openSUSE-SU-2024:10601-1openSUSE-SU-2017:0354-1openSUSE-SU-2017:0357-1

  • firefox-esr Alpine 3.5 45.7.0-r0

alpine advisories ALPINE-CVE-2017-5378

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • firefox Arch Linux 51.0.1-1
  • thunderbird Arch Linux 45.7.0-1

arch linux advisories AVG-157AVG-158

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2017-5378 updated cvss 7.5

Mozilla: Pointer and frame data leakage of Javascript objects (MFSA 2017-02)

  • Red Hat Enterprise Linux (v. 5 server) firefox 45.7.0-2.el5_11 Red Hat Enterprise Linux Client (v. 7) firefox 45.7.0-2.el7_3, thunderbird 45.7.0-1.el7_3 Red Hat Enterprise Linux Client Optional (v. 7) firefox 45.7.0-2.el7_3 Red Hat Enterprise Linux Desktop (v. 5 client) firefox 45.7.0-2.el5_11, thunderbird 45.7.0-1.el5_11 Red Hat Enterprise Linux Desktop (v. 6) firefox 45.7.0-2.el6_8, thunderbird 45.7.0-1.el6_8 Red Hat Enterprise Linux Desktop Optional (v. 6) firefox 45.7.0-2.el6_8
    +1 more products
    Red Hat Enterprise Linux HPC Node Optional (v. 6) firefox 45.7.0-2.el6_8
    fixed: vendor fix RHSA-2017:0190
  • Red Hat Enterprise Linux Optional Productivity Applications (v. 5 server) thunderbird 45.7.0-1.el5_11
    fixed: vendor fix RHSA-2017:0238
  • Red Hat Enterprise Linux Server (v. 6) firefox 45.7.0-2.el6_8 Red Hat Enterprise Linux Server (v. 7) firefox 45.7.0-2.el7_3 Red Hat Enterprise Linux Server Optional (v. 6) firefox 45.7.0-2.el6_8, thunderbird 45.7.0-1.el6_8 Red Hat Enterprise Linux Server Optional (v. 7) firefox 45.7.0-2.el7_3, thunderbird 45.7.0-1.el7_3 Red Hat Enterprise Linux Workstation (v. 6) firefox 45.7.0-2.el6_8, thunderbird 45.7.0-1.el6_8 Red Hat Enterprise Linux Workstation (v. 7) firefox 45.7.0-2.el7_3, thunderbird 45.7.0-1.el7_3
    +2 more products
    Red Hat Enterprise Linux Workstation Optional (v. 6) firefox 45.7.0-2.el6_8 Red Hat Enterprise Linux Workstation Optional (v. 7) firefox 45.7.0-2.el7_3
    fixed: vendor fix RHSA-2017:0190

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

3.29% chance of exploitation in the next 30 days, higher than 88% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • bugzilla.mozilla.org https://bugzilla.mozilla.org/show_bug.cgi?id=1312001 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:P/I:N/A:N

Affected products

  • Mozilla Thunderbird
  • Mozilla Firefox ESR
  • Mozilla Firefox

Classification

Weakness
  • CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.