CVE-2021-40834

Name: CVE-2021-40834
Creator: NVD / NIST
Published: 2021-12-10T14:15:10.093+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.3/10EPSS 0.73%

Last modified Jun 17, 2026

CVE-2021-40834 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. A user interface overlay vulnerability was discovered in F-secure SAFE Browser for Android. When user click on a specially crafted seemingly legitimate URL SAFE browser goes into full screen and hides the user interface. EPSS estimates a 0.73% chance of exploitation in the next 30 days.

Description

A user interface overlay vulnerability was discovered in F-secure SAFE Browser for Android. When user click on a specially crafted seemingly legitimate URL SAFE browser goes into full screen and hides the user interface. A remote attacker can leverage this to perform spoofing attack.

Metrics

CVSS 3.1

4.3/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

EPSS Probability

0.73%

49.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-1021

Affected Software

Vendor	Product	Versions
F-Secure	Safe	<= 17.9

References

Timeline

Published: Dec 10, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-40834?

How severe is CVE-2021-40834?

CVE-2021-40834 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 0.73% probability of exploitation in the next 30 days.

How do I fix CVE-2021-40834?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-40834?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST