CVE-2021-43533 : When parsing internationalized domain names, high bits of the characters in the

When parsing internationalized domain names, high bits of the characters in the URLs were sometimes stripped, resulting in inconsistencies that could lead to user confusion or attacks such as phishing. This vulnerability affects Firefox < 94.

Published 2021-12-08 22:15:09

Updated 2021-12-10 16:52:43

Source Mozilla Corporation

View at NVD, CVE.org

Products affected by CVE-2021-43533

Mozilla » Firefox
Versions before (<) 94.0
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
Matching versions

Exploit prediction scoring system (EPSS) score for CVE-2021-43533

EPSS FAQ

0.08%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 36 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-43533

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
4.3	MEDIUM	AV:N/AC:M/Au:N/C:N/I:P/A:N	8.6	2.9	NIST
Access Vector: Network Access Complexity: Medium Authentication: None Confidentiality Impact: None Integrity Impact: Partial Availability Impact: None
4.3	MEDIUM	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N	2.8	1.4	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: Required Scope: Unchanged Confidentiality: None Integrity: Low Availability: None

References for CVE-2021-43533

https://bugzilla.mozilla.org/show_bug.cgi?id=1724233

Access Denied
Issue Tracking;Permissions Required;Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2021-48/

Security Vulnerabilities fixed in Firefox 94 — Mozilla
Vendor Advisory

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Vulnerability Details : CVE-2021-43533

Products affected by CVE-2021-43533

Exploit prediction scoring system (EPSS) score for CVE-2021-43533

CVSS scores for CVE-2021-43533

References for CVE-2021-43533