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CVE-2020-15654

MEDIUM
6.5
CVSS Score
Published: August 10, 2020 at 05:43 PM UTC
Updated: June 17, 2026 at 02:56 AM UTC
4 products affected across 2 vendorsUbuntu LinuxFirefoxThunderbird

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Severity
MEDIUM6.5
Exploit prediction
EPSS 1%

Description

When in an endless loop, a website specifying a custom cursor using CSS could make it look like the user is interacting with the user interface, when they are not. This could lead to a perceived broken state, especially when interactions with existing browser dialogs and warnings do not work. This vulnerability affects Firefox ESR < 78.1, Firefox < 79, and Thunderbird < 78.1.

Affected

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

Ubuntu Linux· Canonicalrubygems
95%
16.0418.0420.04
Firefox· Mozilla
95%
v < 79v < 79.0
Affected range stops below 79, so it looks safe — our inference, not a vendor statement
Affected range stops below 79.0, so it looks safe — our inference, not a vendor statement
Firefox ESR· Mozilla
95%
v < 78.1
Affected range stops below 78.1, so it looks safe — our inference, not a vendor statement
Thunderbird· Mozilla
95%
v < 78.1
Affected range stops below 78.1, so it looks safe — our inference, not a vendor statement

References (6)

Vendor Advisoryx_refsource_SUSEThird Party Advisory
Source: [email protected]
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00025.html
x_refsource_MISCIssue TrackingVendor Advisory
Source: [email protected]
https://bugzilla.mozilla.org/show_bug.cgi?id=1648333
Vendor Advisoryx_refsource_UBUNTUThird Party Advisory
Source: [email protected]
https://usn.ubuntu.com/4443-1/
x_refsource_MISCVendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2020-30/
x_refsource_MISCVendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2020-32/
x_refsource_MISCVendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2020-33/

CVSS

6.5MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-835

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