{"id":"CVE-2021-40835","aliases":["EUVD-2021-27992","GHSA-75cm-2vvh-47g6"],"status":"published","title":"URL Address Bar Spoofing in F-Secure SAFE Browser for iOS","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.","severity":{"version":"3.1","score":4.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00729,"percentile":0.54655,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"published":"2021-12-16T10:58:55Z","modified":"2026-06-17T04:07:30Z","products":[{"vendor":"f-secure","product":"f-secure mobile security"},{"vendor":"f-secure","product":"safe"}],"references":[{"url":"https://www.f-secure.com/en/business/programs/vulnerability-reward-program/hall-of-fame","tags":["x_refsource_MISC","x_transferred","Vendor Advisory"]},{"url":"https://www.f-secure.com/en/business/support-and-downloads/security-advisories","tags":["x_refsource_MISC","x_transferred","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-40835"},{"url":"https://github.com/advisories/GHSA-75cm-2vvh-47g6"}],"sources":{"cve":[{"id":"CVE-2021-40835","title":"URL Address Bar Spoofing in F-Secure SAFE Browser for iOS","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.","status":"published","published":"2021-12-16T10:58:55Z","modified":"2024-08-04T02:51:07.421Z","cvss":[{"version":"3.1","score":4.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N","level":"medium","assessor":"cna"}],"updated_at":"2026-11-02T14:33:01.495293Z"}],"euvd":[{"id":"EUVD-2021-27992","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.","status":"published","published":"2021-12-16T10:58:55Z","modified":"2024-08-04T02:51:07Z","cvss":[{"version":"3.1","score":4.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-03T03:24:19.692229Z"}],"ghsa":[{"id":"GHSA-75cm-2vvh-47g6","title":"An URL Address bar spoofing vulnerability was discovered in Safe Browser for iOS. When user...","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.","status":"published","published":"2021-12-17T00:00:26Z","modified":"2023-02-01T05:06:52Z","updated_at":"2026-11-02T14:50:26.062502Z"}],"nvd":[{"id":"CVE-2021-40835","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.","status":"published","published":"2021-12-16T11:15:07.977Z","modified":"2026-06-17T04:07:30.573Z","cvss":[{"version":"3.1","score":4.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N","level":"medium","assessor":"secondary"},{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":4.3,"vector":"AV:N/AC:M/Au:N/C:N/I:P/A:N","level":"medium","assessor":"primary"}],"updated_at":"2026-11-02T14:07:02.566991Z"}]}}