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CVE-2019-9815

N/A

Published: July 23, 2019 at 01:24 PM UTC

Updated: June 17, 2026 at 02:44 AM UTC

3 products affected across 1 vendorFirefoxThunderbirdFirefox ESR· also runs on 1 platform

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Severity

N/A

Exploit prediction

EPSS 2%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Firefox · Mozilla

95%

v < 67

Affected range stops below 67, so it looks safe — our inference, not a vendor statement

Affected range stops below 67.0, so it looks safe — our inference, not a vendor statement

apple-macos (environment)

Firefox ESR · Mozilla

95%

v < 60.7

Affected range stops below 60.7, so it looks safe — our inference, not a vendor statement

apple-macos (environment)

Thunderbird · Mozilla

95%

v < 60.7

Affected range stops below 60.7, so it looks safe — our inference, not a vendor statement

apple-macos (environment)

Runs on — not affected

The affected product only carries this flaw when running on these platforms. The platforms themselves are not vulnerable.

95%

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (5)

x_refsource_MISCPermissions RequiredThird Party Advisory

Source: [email protected]

https://bugzilla.mozilla.org/show_bug.cgi?id=1546544

x_refsource_MISCThird Party Advisory

Source: [email protected]

https://mdsattacks.com/

x_refsource_MISCVendor Advisory

Source: [email protected]

https://www.mozilla.org/security/advisories/mfsa2019-13/

x_refsource_MISCVendor Advisory

Source: [email protected]

https://www.mozilla.org/security/advisories/mfsa2019-14/

x_refsource_MISCVendor Advisory

Source: [email protected]

https://www.mozilla.org/security/advisories/mfsa2019-15/

CVSS

6.8MEDIUM[email protected]

Confidentiality: PARTIAL
Integrity: PARTIAL
Availability: PARTIAL

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-203

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