CVE-2021-23957

HIGH EXPLOITED

Firefox < 85.0 - Sandbox Escape via Android Intent URL Scheme

Title source: llm
STIX 2.1

Exploitation Summary

CVE-2021-23957 has been observed exploited in the wild (reported by VulnCheck KEV).

Description

Navigations through the Android-specific `intent` URL scheme could have been misused to escape iframe sandbox. Note: This issue only affected Firefox for Android. Other operating systems are unaffected. This vulnerability affects Firefox < 85.

References (2)

Core 2
Core References
Release Notes, Vendor Advisory x_refsource_misc
https://www.mozilla.org/security/advisories/mfsa2021-03/
Issue Tracking, Permissions Required, Vendor Advisory x_refsource_misc
https://bugzilla.mozilla.org/show_bug.cgi?id=1584582

Scores

CVSS v3 7.4
EPSS 0.0028
EPSS Percentile 51.8%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N

Details

VulnCheck KEV 2023-09-27
Status published
Products (1)
mozilla/firefox < 85.0
Published Feb 26, 2021
Tracked Since Feb 18, 2026