What is CVE-2021-33594?

CVE-2021-33594 is a low-severity vulnerability in F-Secure Mobile Security. CVSS score: 3.5/10. Published 2021-08-11.

How severe is CVE-2021-33594?

Low severity. CVSS v3 base score is 3.5 out of 10.

Is CVE-2021-33594 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in F-Secure Mobile Security

CVE-2021-33594

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.

Published 2021-08-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 3.5 (Low). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.011 (65.0th percentile), scored 2026-10-31.

Low probability of exploitation in the next 30 days, but still tracked. 65th percentile — 65.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

F-Secure Mobile Security — versions 18.4x
F-Secure Safe

Public proof-of-concept exploits

n0-traces/cve_

References

www.f-secure.com/en/business/programs/vulnerability-reward-program/hall-of-fame (Vendor Advisory)
www.f-secure.com/en/business/support-and-downloads/security-advisories (Vendor Advisory)
www.f-secure.com/en/business/support-and-downloads/security-advisories/cve-2021… (Vendor Advisory)

Frequently asked questions

What is CVE-2021-33594?: CVE-2021-33594 is a low-severity vulnerability in F-Secure Mobile Security. CVSS score: 3.5/10. Published 2021-08-11.
How severe is CVE-2021-33594?: Low severity. CVSS v3 base score is 3.5 out of 10.
Is CVE-2021-33594 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.