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CVE-2019-9815

8.1 · HIGH

If hyperthreading is not disabled, a timing attack vulnerability exists, similar to previous Spectre attacks.

Published Jul 23, 2019CWE-203EPSS 1.83%

Overview

CVE-2019-9815 is a high-severity vulnerability. It was published on July 23, 2019 and has a CVSS 3.0 base score of 8.1 (HIGH).

This vulnerability has a CVSS 3.0 base score of 8.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refbugzilla.mozilla.org/show_bug.cgi?id=1546544Refmdsattacks.com/Refwww.mozilla.org/security/advisories/mfsa2019-13/Refwww.mozilla.org/security/advisories/mfsa2019-14/Refwww.mozilla.org/security/advisories/mfsa2019-15/Refbugzilla.mozilla.org/show_bug.cgi?id=1546544Refmdsattacks.com/Refwww.mozilla.org/security/advisories/mfsa2019-13/Refwww.mozilla.org/security/advisories/mfsa2019-14/Refwww.mozilla.org/security/advisories/mfsa2019-15/

How CyberStrike helps

Frequently asked questions

What is CVE-2019-9815?

CVE-2019-9815 is a high-severity vulnerability. It was published on July 23, 2019 and has a CVSS 3.0 base score of 8.1 (HIGH).

How severe is CVE-2019-9815?

This vulnerability has a CVSS 3.0 base score of 8.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2019-9815?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2019-9815?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2019-9815 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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