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CVE-2020-35112

HIGH
8.8
CVSS Score
Published: January 7, 2021 at 01:50 PM UTC
Updated: June 17, 2026 at 03:13 AM UTC
3 products affected across 1 vendorFirefoxThunderbirdFirefox ESR· also runs on 1 platform

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Severity
HIGH8.8
Exploit prediction
EPSS 1%

Description

If a user downloaded a file lacking an extension on Windows, and then "Open"-ed it from the downloads panel, if there was an executable file in the downloads directory with the same name but with an executable extension (such as .bat or .exe) that executable would have been launched instead. *Note: This issue only affected Windows operating systems. Other operating systems are unaffected.*. This vulnerability affects Firefox < 84, Thunderbird < 78.6, and Firefox ESR < 78.6.

Affected

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

Firefox· Mozilla
95%
v < 84
Affected range stops below 84, so it looks safe — our inference, not a vendor statement
Affected range stops below 84.0, so it looks safe — our inference, not a vendor statement
microsoft-windows (environment)
Firefox ESR· Mozilla
95%
v < 78.6
Affected range stops below 78.6, so it looks safe — our inference, not a vendor statement
Affected range stops below 78.6.0, so it looks safe — our inference, not a vendor statement
microsoft-windows (environment)
Thunderbird· Mozilla
95%
v < 78.6
Affected range stops below 78.6, so it looks safe — our inference, not a vendor statement
Affected range stops below 78.6.0, so it looks safe — our inference, not a vendor statement
microsoft-windows (environment)

Runs on — not affected

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

Remediation

No guide yet

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

Patch and advisory references

References (4)

x_refsource_MISCPermissions Required
Source: [email protected]
https://bugzilla.mozilla.org/show_bug.cgi?id=1661365
x_refsource_MISCVendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2020-54/
x_refsource_MISCVendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2020-55/
x_refsource_MISCVendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2020-56/

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
NVD-CWE-noinfo

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