What’s Vulnerable › Vulnerabilities

CVE-2018-12367

• Severity: medium (CVSS 4.3 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.0% 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-20

Description

In the previous mitigations for Spectre, the resolution or precision of various methods was reduced to counteract the ability to measure precise time intervals. In that work PerformanceNavigationTiming was not adjusted but it was found that it could be used as a precision timer. 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/104561
• http://www.securitytracker.com/id/1041193
• https://bugzilla.mozilla.org/show_bug.cgi?id=1462891
• 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/104561

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