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TI-2021-17760 Aliases CVE-2021-40835GHSA-75cm-2vvh-47g6

URL Address Bar Spoofing in F-Secure SAFE Browser for iOS

Priority LOW 22Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
Required
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
Low · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

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.

Why it matters now

EPSS 0.00729 54th percentileScored 2026-11-07
Fix Fixed F-Secure Mobile Security (F-Secure): 18.5

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
F-SecureF-Secure Mobile Security18.3 to before 18.518.5Patch availableCNA
  • F-Secure Mobile Security VendorF-Secure Affected 18.3 to before 18.5 Fixed in 18.5 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:f-secure:safe:*:*:*:*:*:iphone_os:*:*before 18.3VulnerableF-Secure
  • cpe:2.3:a:f-secure:safe:*:*:*:*:*:iphone_os:*:* Versions before 18.3 Vulnerable ·F-Secure

Remediation

  • Fix · CNA F-Secure Mobile Security (F-Secure) Fixed in 18.5

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-40835
  2. 2026-10-03 Alias added: GHSA-75cm-2vvh-47g6

References

Advisory 2

  • TI-2021-20261 Universal Cross-Site Scripting Vulnerability in F-Secure SAFE Browser Protection for Android CVSS 3.1CRITICAL 9.6
  • TI-2020-11780 An issue was discovered in F-Secure SAFE 17.7 on macOS. CVSS 3.1HIGH 8.1
  • TI-2020-11779 An issue was discovered in F-Secure SAFE 17.7 on macOS. CVSS 3.1HIGH 8.1
  • TI-2022-11493 Address Bar Spoofing Vulnerability in F-Secure SAFE Browser for Android CVSS 3.1HIGH 8.8
  • TI-2019-08714 In the F-Secure installer in F-Secure SAFE for Windows before 17.6, F-Secure Internet… CVSS 3.0HIGH 7.8
  • TI-2022-17862 A vulnerability affecting F-Secure SAFE browser for Android and iOS was discovered. CVSS 3.1MEDIUM 6.5
See all 18 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences