CVE-2018-12388

Severity: high (CVSS 8.8 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2019-02-28 · updated 2026-06-17
Weakness: CWE-119

Description

Mozilla developers and community members reported memory safety bugs present in Firefox 62. 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 < 63.

Affected products

Canonical Ubuntu Linux: 14.04, 16.04, 18.04, 18.10
Mozilla Firefox: before 63.0 — fixed in 63.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 63.0. Check the vendor advisory for mitigations.

References

http://www.securityfocus.com/bid/105721
http://www.securitytracker.com/id/1041944
https://bugzilla.mozilla.org/buglist.cgi?bug_id=1472639%2C1485698%2C1301547%2C1471427%2C1379411%2C1482122%2C1486314%2C1487167
https://usn.ubuntu.com/3801-1/
https://www.mozilla.org/security/advisories/mfsa2018-26/
http://www.securityfocus.com/bid/105721
http://www.securitytracker.com/id/1041944
https://bugzilla.mozilla.org/buglist.cgi?bug_id=1472639%2C1485698%2C1301547%2C1471427%2C1379411%2C1482122%2C1486314%2C1487167
https://usn.ubuntu.com/3801-1/
https://www.mozilla.org/security/advisories/mfsa2018-26/

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