CVE-2021-40835

MediumCVSS 4.3/10Last modified Jun 17, 2026

Description

An URL Address bar spoofing vulnerability was discovered in Safe Browser for iOS. When user clicks on a specially crafted a malicious URL, if user does not carefully pay attention to url, user may be tricked to think content may be coming from a valid domain, while it comes from another. This is performed by using a very long username part of the url so that user cannot see the domain name. A remote attacker can leverage this to perform url address bar spoofing attack. The fix is, browser no longer shows the user name part in address bar.

Metrics

CVSS 3.1 4.3/10CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

Affected software

Vendor	Product	Versions
F-Secure	F-Secure Mobile Security	>= 18.3, < 18.5

References

https://www.f-secure.com/en/business/programs/vulnerability-reward-program/hall-of-fameVendor Advisory
https://www.f-secure.com/en/business/support-and-downloads/security-advisoriesVendor Advisory
https://www.f-secure.com/en/business/programs/vulnerability-reward-program/hall-of-fameVendor Advisory
https://www.f-secure.com/en/business/support-and-downloads/security-advisoriesVendor Advisory

Timeline

Published: Dec 16, 2021
Last modified: Jun 17, 2026
NVD status: Modified

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