Memory safety bugs were reported in Firefox 56.

published 2018-06-11 8y ago modified 2026-06-17 4mo ago also EUVD-2017-16802

cvss: 9.8; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 2.7%; EPSS 2.7% chance of exploitation in 30 days, percentile 86%
public exploits: 0; none known

Memory safety bugs were reported in Firefox 56. 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.

Patch / fix

fixed in 1 distros 3

Mozilla Firefox 57

ubuntu opensuse arch linux

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

ubuntu advisories UBUNTU-CVE-2017-7827

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

firefox-esr openSUSE Tumbleweed 128.5.1-1.1
MozillaFirefox openSUSE Tumbleweed 92.0-1.2

opensuse advisories openSUSE-SU-2024:14572-1 openSUSE-SU-2024:10600-1

firefox Arch Linux 57.0-1

arch linux advisories AVG-494

Is CVE-2017-7827 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

Exploit prediction

2.73% chance of exploitation in the next 30 days, higher than 86% of all scored CVEs (FIRST EPSS, 2026-11-09).

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

Classification

Weakness

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

References

mozilla.org /security/advisories/mfsa2017-24/
vendor-advisory
bugzilla.mozilla.org /buglist.cgi?bug_id=1399922%2C1403646%2C1403716%2C1365894%2C1402876%2C1406154%2C1384121%2C1384615%2C1407375%2C
issue-tracking, permissions-required
securityfocus.com /bid/101832
vdb-entry, third-party-advisory
securitytracker.com /id/1039803
vdb-entry, third-party-advisory

Sources

CVE List CVE-2017-7827
NVD CVE-2017-7827

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.