CVE-2021-23998

MEDIUM

Firefox < 88.0 and Firefox ESR < 78.10 - Insufficient Verification of Data Authenticity via Window Navigation

Title source: llm
STIX 2.1

Description

Through complicated navigations with new windows, an HTTP page could have inherited a secure lock icon from an HTTPS page. This vulnerability affects Firefox ESR < 78.10, Thunderbird < 78.10, and Firefox < 88.

References (4)

Core 4
Core References
Release Notes, Vendor Advisory x_refsource_misc
https://www.mozilla.org/security/advisories/mfsa2021-14/
Release Notes, Vendor Advisory x_refsource_misc
https://www.mozilla.org/security/advisories/mfsa2021-16/
Release Notes, Vendor Advisory x_refsource_misc
https://www.mozilla.org/security/advisories/mfsa2021-15/
Issue Tracking, Permissions Required, Vendor Advisory x_refsource_misc
https://bugzilla.mozilla.org/show_bug.cgi?id=1667456

Scores

CVSS v3 6.5
EPSS 0.0016
EPSS Percentile 36.8%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

Details

CWE
CWE-345
Status published
Products (3)
mozilla/firefox < 88.0
mozilla/firefox_esr < 78.10
mozilla/thunderbird < 78.10
Published Jun 24, 2021
Tracked Since Feb 18, 2026