CVE-2021-40835: F-Secure Safe

Medium severity, CVSS 4.3. EPSS: 0.7% chance of exploitation in the next 30 days.

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.

Affected products

• F-Secure Safe: before 18.3 (fixed in 18.3)

Published 2021-12-16. Last modified 2026-06-17.