Memory safety bugs were reported in Firefox 50.1.

published 2018-06-11 8 y ago modified 2026-06-17 4 mo ago also EUVD-2017-14478

cvss: 9.8; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.8%; EPSS 1.8% chance of exploitation in 30 days, percentile 78%
public exploits: 0; none known

Memory safety bugs were reported in Firefox 50.1. 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 < 51.

Patch / fix

fixed in 1 distros 3

Mozilla Firefox 51

ubuntu opensuse arch linux

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

ubuntu advisories UBUNTU-CVE-2017-5374

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 51.0.1-1

arch linux advisories AVG-157

Exploit prediction

1.79% chance of exploitation in the next 30 days, higher than 78% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

bugzilla.mozilla.org https://bugzilla.mozilla.org/buglist.cgi?bug_id=1325344%2C1317501%2C1311319%2C1329989%2C1300145%2C1322305%2C1288561%2C1295747%2C1318766%2C1297808%2C1321374%2C1324810%2C1313385%2C1319888%2C1302231%2C1307458%2C1293327%2C1315447%2C1319456 referenced PoC, tagged "exploit" by a source, unverified

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	7.5	AV:N/AC:L/Au:N/C:P/I:P/A:P

Affected products

Mozilla Firefox

Classification

Weakness

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

References

bugzilla.mozilla.org /buglist.cgi?bug_id=1325344%2C1317501%2C1311319%2C1329989%2C1300145%2C1322305%2C1288561%2C1295747%2C1318766%2C
exploit, issue-tracking, vendor-advisory
mozilla.org /security/advisories/mfsa2017-01/
vendor-advisory
securityfocus.com /bid/95759
vdb-entry, third-party-advisory
securitytracker.com /id/1037693
vdb-entry, third-party-advisory

Sources

CVE List CVE-2017-5374
NVD CVE-2017-5374

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.

Summary