CVE-2019-9815

HighCVSS 8.1/10Last modified Jun 17, 2026

Description

If hyperthreading is not disabled, a timing attack vulnerability exists, similar to previous Spectre attacks. Apple has shipped macOS 10.14.5 with an option to disable hyperthreading in applications running untrusted code in a thread through a new sysctl. Firefox now makes use of it on the main thread and any worker threads. *Note: users need to update to macOS 10.14.5 in order to take advantage of this change.*. This vulnerability affects Thunderbird < 60.7, Firefox < 67, and Firefox ESR < 60.7.

Metrics

CVSS 3.0 8.1/10CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-203

Affected software

Vendor	Product	Versions
Mozilla	Thunderbird	>= unspecified, < 60.7
Mozilla	Firefox	>= unspecified, < 67
Mozilla	Firefox ESR	>= unspecified, < 60.7

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1546544Permissions Required, Third Party Advisory
https://mdsattacks.com/Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2019-13/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-14/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-15/Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1546544Permissions Required, Third Party Advisory
https://mdsattacks.com/Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2019-13/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-14/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-15/Vendor Advisory

Timeline

Published: Jul 23, 2019
Last modified: Jun 17, 2026
NVD status: Modified

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