CVE-2020-15680
MEDIUMFirefox < 82.0 - External Protocol Handler Detection via Image Tag
Title source: llmDescription
If a valid external protocol handler was referenced in an image tag, the resulting broken image size could be distinguished from a broken image size of a non-existent protocol handler. This allowed an attacker to successfully probe whether an external protocol handler was registered. This vulnerability affects Firefox < 82.
References (2)
Core 2
Core References
Release Notes, Vendor Advisory x_refsource_misc
https://www.mozilla.org/security/advisories/mfsa2020-45/
Issue Tracking, Permissions Required, Vendor Advisory x_refsource_misc
https://bugzilla.mozilla.org/show_bug.cgi?id=1658881
Scores
CVSS v3
5.3
EPSS
0.0032
EPSS Percentile
55.1%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Details
Status
published
Products (1)
mozilla/firefox
< 82.0
Published
Oct 22, 2020
Tracked Since
Feb 18, 2026