What’s Vulnerable › Vulnerabilities

CVE-2018-5187

• Severity: critical (CVSS 9.8 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2018-10-18 · updated 2026-06-17
• Weakness: CWE-119

Description

Memory safety bugs present in Firefox 60 and Firefox ESR 60. 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 Thunderbird < 60, Firefox ESR < 60.1, and Firefox < 61.

Affected products

• Canonical Ubuntu Linux: 14.04, 16.04, 17.10, 18.04
• Debian Linux: 8.0, 9.0
• Mozilla Firefox: before 60.1.0; before 61.0 — fixed in 60.1.0, 61.0
• Mozilla Thunderbird: before 60.0 — fixed in 60.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 60.1.0, 61.0; Mozilla Thunderbird 60.0. Check the vendor advisory for mitigations.

References

• http://www.securityfocus.com/bid/104556
• https://bugzilla.mozilla.org/buglist.cgi?bug_id=1461324%2C1414829%2C1395246%2C1467938%2C1461619%2C1425930%2C1438556%2C1454285%2C1459568%2C1463884
• https://lists.debian.org/debian-lts-announce/2018/11/msg00011.html
• https://security.gentoo.org/glsa/201810-01
• https://security.gentoo.org/glsa/201811-13
• https://usn.ubuntu.com/3705-1/
• https://www.debian.org/security/2018/dsa-4295
• https://www.mozilla.org/security/advisories/mfsa2018-15/
• https://www.mozilla.org/security/advisories/mfsa2018-16/
• https://www.mozilla.org/security/advisories/mfsa2018-19/
• http://www.securityfocus.com/bid/104556
• https://bugzilla.mozilla.org/buglist.cgi?bug_id=1461324%2C1414829%2C1395246%2C1467938%2C1461619%2C1425930%2C1438556%2C1454285%2C1459568%2C1463884

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