A use-after-free vulnerability can occur when arguments passed to the "IsPotentiallyScrollable" function are freed while still in use by sc…

published 2018-06-11 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-16886

cvss: 7.5; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 5.3%; EPSS 5.3% chance of exploitation in 30 days, percentile 92%
public exploits: 0; none known

A use-after-free vulnerability can occur when arguments passed to the "IsPotentiallyScrollable" function are freed while still in use by scripts. This results in a potentially exploitable crash. This vulnerability affects Firefox < 58.

Patch / fix

fixed in 1 distros 2

Mozilla Firefox 58

ubuntu opensuse

firefox Ubuntu 14.04 LTS 58.0+build6-0ubuntu0.14.04.1
firefox Ubuntu 16.04 LTS 58.0+build6-0ubuntu0.16.04.1
firefox Ubuntu 18.04 LTS 59.0.1+build1-0ubuntu1

ubuntu advisories UBUNTU-CVE-2018-5100

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

Exploit prediction

5.27% chance of exploitation in the next 30 days, higher than 92% of all scored CVEs (FIRST EPSS, 2026-11-09).

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:N/I:N/A:H
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected products

Mozilla Firefox

Classification

Weakness

CWE-416 Use After Free

References

usn.ubuntu.com /3544-1/
vendor-advisory, third-party-advisory
mozilla.org /security/advisories/mfsa2018-02/
vendor-advisory
securitytracker.com /id/1040270
vdb-entry, third-party-advisory
bugzilla.mozilla.org /show_bug.cgi?id=1417405
issue-tracking, permissions-required
securityfocus.com /bid/102786
vdb-entry, third-party-advisory

Sources

CVE List CVE-2018-5100
NVD CVE-2018-5100

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