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CVE-2020-15663

HIGH
8.8
CVSS Score
Published: October 1, 2020 at 06:43 PM UTC
Updated: June 17, 2026 at 02:57 AM UTC
3 products affected across 1 vendorFirefoxThunderbirdFirefox ESR

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Severity
HIGH8.8
Exploit prediction
EPSS 3%

Description

If Firefox is installed to a user-writable directory, the Mozilla Maintenance Service would execute updater.exe from the install location with system privileges. Although the Mozilla Maintenance Service does ensure that updater.exe is signed by Mozilla, the version could have been rolled back to a previous version which would have allowed exploitation of an older bug and arbitrary code execution with System Privileges. *Note: This issue only affected Windows operating systems. Other operating systems are unaffected.*. This vulnerability affects Firefox < 80, Thunderbird < 78.2, Thunderbird < 68.12, Firefox ESR < 68.12, and Firefox ESR < 78.2.

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 < 78.268.0 ≤ v < 68.12
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
Thunderbird· Mozilla
95%
v < 68.12v < 78.268.0 ≤ v < 68.1278.0 ≤ 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

References (6)

x_refsource_MISCIssue TrackingPermissions RequiredVendor Advisory
Source: [email protected]
https://bugzilla.mozilla.org/show_bug.cgi?id=1643199
x_refsource_MISCRelease NotesVendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2020-36/
x_refsource_MISCRelease NotesVendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2020-37/
x_refsource_MISCRelease NotesVendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2020-38/
x_refsource_MISCRelease NotesVendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2020-40/
x_refsource_MISCRelease NotesVendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2020-41/

CVSS

8.8HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-427

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