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Fencer Vulns
critical 9.8

CVE-2017-7826 json

Memory safety bugs were reported in Firefox 56 and Firefox ESR 52.4.

published 2018-06-11 8 y ago modified 2026-06-17 4 mo ago also EUVD-2017-16801

cvss
9.8
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

Memory safety bugs were reported in Firefox 56 and Firefox ESR 52.4. Some of these bugs showed evidence of memory corruption and we presume that with enough effort that some of these could be exploited to run arbitrary code. This vulnerability affects Firefox < 57, Firefox ESR < 52.5, and Thunderbird < 52.5.

Patch / fix

  • Mozilla Firefox 57
  • Mozilla Firefox ESR 52.5
  • Mozilla Thunderbird 52.5
  • firefox-esr Debian 14, Debian 13, Debian 12 52.5.0esr-1
  • thunderbird Debian 14, Debian 13, Debian 12 1:52.5.0-1

debian advisories DEBIAN-CVE-2017-7826

  • firefox Ubuntu 14.04 LTS 57.0+build4-0ubuntu0.14.04.4
  • firefox Ubuntu 16.04 LTS 57.0+build4-0ubuntu0.16.04.5
  • firefox Ubuntu 18.04 LTS 57.0.1+build2-0ubuntu1
  • mozjs52 Ubuntu 18.04 LTS 52.8.1-0ubuntu0.18.04.1
  • thunderbird Ubuntu 14.04 LTS 1:52.5.0+build1-0ubuntu0.14.04.1
  • thunderbird Ubuntu 16.04 LTS 1:52.5.0+build1-0ubuntu0.16.04.1
  • thunderbird Ubuntu 18.04 LTS 1:52.6.0+build1-0ubuntu1

ubuntu advisories UBUNTU-CVE-2017-7826

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 6 52.5.0-1.el6_9
  • thunderbird RHEL 7 52.5.0-1.el7_4
  • firefox RHEL 6 52.5.0-1.el6_9
  • firefox RHEL 7 52.5.0-1.el7_4

red hat advisories RHSA-2017:3372RHSA-2017:3247

  • MozillaFirefox SLES for SAP 11 SP4, SLES 11 SP4, SLES 11 SP3-TERADATA +3 more 52.5.0esr-72.17.1
  • MozillaFirefox SLES for SAP 12 SP3, SLES for SAP 12 SP2, SLES for SAP 12 SP1 +10 more 52.5.0esr-109.9.1

suse advisories SUSE-SU-2017:3233-1SUSE-SU-2017:3213-1

  • 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 52.5.0-48.1

opensuse advisories openSUSE-SU-2024:14572-1openSUSE-SU-2024:10600-1openSUSE-SU-2024:10601-1openSUSE-SU-2017:3108-1openSUSE-SU-2017:3110-1

  • firefox Arch Linux 57.0-1
  • thunderbird Arch Linux 52.5.0-1

arch linux advisories AVG-494AVG-530

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-2017-7826 updated cvss 9.8

Mozilla: Memory safety bugs fixed in Firefox 57 and Firefox ESR 52.5 (MFSA 2017-25)

  • Red Hat Enterprise Linux Client (v. 7) firefox 52.5.0-1.el7_4, thunderbird 52.5.0-1.el7_4 Red Hat Enterprise Linux Client Optional (v. 7) firefox 52.5.0-1.el7_4 Red Hat Enterprise Linux Desktop (v. 6) firefox 52.5.0-1.el6_9, thunderbird 52.5.0-1.el6_9 Red Hat Enterprise Linux Desktop Optional (v. 6) firefox 52.5.0-1.el6_9 Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) firefox 52.5.0-1.el7_4
    fixed: vendor fix RHSA-2017:3247
  • Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) thunderbird 52.5.0-1.el7_4
    fixed: vendor fix RHSA-2017:3372
  • Red Hat Enterprise Linux HPC Node Optional (v. 6) firefox 52.5.0-1.el6_9 Red Hat Enterprise Linux Server (v. 6) firefox 52.5.0-1.el6_9 Red Hat Enterprise Linux Server (v. 7) firefox 52.5.0-1.el7_4 Red Hat Enterprise Linux Server Optional (v. 6) firefox 52.5.0-1.el6_9, thunderbird 52.5.0-1.el6_9 Red Hat Enterprise Linux Server Optional (v. 7) firefox 52.5.0-1.el7_4, thunderbird 52.5.0-1.el7_4 Red Hat Enterprise Linux Workstation (v. 6) firefox 52.5.0-1.el6_9, thunderbird 52.5.0-1.el6_9
    +3 more products
    Red Hat Enterprise Linux Workstation (v. 7) firefox 52.5.0-1.el7_4, thunderbird 52.5.0-1.el7_4 Red Hat Enterprise Linux Workstation Optional (v. 6) firefox 52.5.0-1.el6_9 Red Hat Enterprise Linux Workstation Optional (v. 7) firefox 52.5.0-1.el7_4
    fixed: vendor fix RHSA-2017:3247

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

3.33% chance of exploitation in the next 30 days, higher than 88% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 9.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 10.0 AV:N/AC:L/Au:N/C:C/I:C/A:C

Affected products

  • Mozilla Firefox
  • Mozilla Firefox ESR
  • Mozilla Thunderbird

Classification

Weakness
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

References

Sources

Fencer Vulns 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.