CVE-2018-18502

Severity: critical (CVSS 9.8 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2019-02-05 · updated 2026-06-17
Weakness: CWE-119

Description

Mozilla developers and community members reported memory safety bugs present in Firefox 64. 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 < 65.

Affected products

Canonical Ubuntu Linux: 14.04, 16.04, 18.04, 18.10
Mozilla Firefox: before 65.0 — fixed in 65.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 65.0. Check the vendor advisory for mitigations.

References

http://www.securityfocus.com/bid/106773
https://usn.ubuntu.com/3874-1/
https://www.mozilla.org/security/advisories/mfsa2019-01/
http://www.securityfocus.com/bid/106773
https://usn.ubuntu.com/3874-1/
https://www.mozilla.org/security/advisories/mfsa2019-01/

Get alerted when CVE-2018-18502 or the next vulnerability affects your stack