CVE-2021-23972

HIGH

Firefox < 86.0 - Phishing Attack via Cached HTTP Auth Redirect

Title source: llm

Description

One phishing tactic on the web is to provide a link with HTTP Auth. For example 'https://[email protected]'. To mitigate this type of attack, Firefox will display a warning dialog; however, this warning dialog would not have been displayed if evil.com used a redirect that was cached by the browser. This vulnerability affects Firefox < 86.

References (3)

Core 3

Core References

Release Notes, Vendor Advisory x_refsource_misc

https://www.mozilla.org/security/advisories/mfsa2021-07/

Issue Tracking, Permissions Required, Vendor Advisory x_refsource_misc

https://bugzilla.mozilla.org/show_bug.cgi?id=1683536

Third Party Advisory vendor-advisory x_refsource_gentoo

https://security.gentoo.org/glsa/202104-10

Scores

CVSS v3 8.8

EPSS 0.0041

EPSS Percentile 61.2%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Details

Status published

Products (1)

mozilla/firefox < 86.0

Published Feb 26, 2021

Tracked Since Feb 18, 2026