What’s Vulnerable › Vulnerabilities

CVE-2021-33594: F-Secure Safe browser for Android vulnerable to Address Bar Spoofing

• Severity: low (CVSS 3.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-08-11 · updated 2026-06-17

Description

An address bar spoofing vulnerability was discovered in Safe Browser for Android. When user clicks on a specially crafted a malicious URL, it appears like a legitimate one on the address bar, while the content comes from other domain and presented in a window, covering the original content. A remote attacker can leverage this to perform address bar spoofing attack.

Affected products

• F-Secure SAFE Browser for Android Version 18.5: before 18.4.0 — fixed in 18.4.0

How to fix

Upgrade to a fixed version: F-Secure SAFE Browser for Android Version 18.5 18.4.0. Check the vendor advisory for mitigations.

References

• https://www.f-secure.com/en/business/programs/vulnerability-reward-program/hall-of-fame
• https://www.f-secure.com/en/business/support-and-downloads/security-advisories
• https://www.f-secure.com/en/business/support-and-downloads/security-advisories/cve-2021-33594
• https://www.f-secure.com/en/business/programs/vulnerability-reward-program/hall-of-fame
• https://www.f-secure.com/en/business/support-and-downloads/security-advisories
• https://www.f-secure.com/en/business/support-and-downloads/security-advisories/cve-2021-33594

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