CVE-2021-23959

medium

Description

An XSS bug in internal error pages could have led to various spoofing attacks, including other error pages and the address bar. Note: This issue only affected Firefox for Android. Other operating systems are unaffected. This vulnerability affects Firefox < 85.

References

https://www.mozilla.org/security/advisories/mfsa2021-03/

https://euvd.enisa.europa.eu/vulnerability/EUVD-2021-10880

https://bugzilla.mozilla.org/show_bug.cgi?id=1659035

Details

Source: Mitre, NVD

Published: 2021-02-26

Updated: 2026-06-17

Risk Information

CVSS v2

Base Score: 4.3

Vector: CVSS2#AV:N/AC:M/Au:N/C:N/I:P/A:N

Severity: Medium

CVSS v3

Base Score: 6.1

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

Severity: Medium

EPSS

EPSS: 0.00567