CVE-2020-15664

MEDIUM

6.5

CVSS Score

Published: October 1, 2020 at 06:43 PM UTC

Updated: August 19, 2026 at 03:50 PM UTC

4 products affected across 1 vendorFirefoxThunderbirdFirefox ESR

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Severity

MEDIUM6.5

Exploit prediction

EPSS 1%

Description

By holding a reference to the eval() function from an about:blank window, a malicious webpage could have gained access to the InstallTrigger object which would allow them to prompt the user to install an extension. Combined with user confusion, this could result in an unintended or malicious extension being installed. This vulnerability affects Firefox < 80, Thunderbird < 78.2, Thunderbird < 68.12, Firefox ESR < 68.12, Firefox ESR < 78.2, and Firefox for Android < 80.

Affected

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

Firefox · Mozilla

95%

v < 80v < 80.078.0 ≤ v < 78.2

Affected range stops below 78.2, so it looks safe — our inference, not a vendor statement

Affected range stops below 80, so it looks safe — our inference, not a vendor statement

Affected range stops below 80.0, so it looks safe — our inference, not a vendor statement

Firefox ESR · Mozilla

95%

v < 68.12v < 78.2

Affected range stops below 68.12, so it looks safe — our inference, not a vendor statement

Affected range stops below 78.2, so it looks safe — our inference, not a vendor statement

Firefox Mobile · Mozilla

95%

v < 80.0

Affected range stops below 80.0, so it looks safe — our inference, not a vendor statement

Thunderbird · Mozilla

95%

v < 68.12v < 78.278.0 ≤ v < 78.2

Affected range stops below 68.12, so it looks safe — our inference, not a vendor statement

Affected range stops below 78.2, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

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

Patch and advisory references