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CVE-2021-40834— User interface Spoofing in F-Secure SAFE browser for Android

Quick assessment

Affected
F-Secure F-Secure Mobile Security
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

F-Secure Safe Browser是芬兰F-Secure公司的一款互联网安全浏览器。用于实时阻止病毒、木马、勒索软件和其他威胁。 F-secure SAFE Browser for Android 存在安全漏洞，该漏洞源于当用户单击特制的看似合法的 URL 时，SAFE 浏览器会进入全屏并隐藏用户界面。 远程攻击者可以利用它来执行欺骗攻击。

CVSS 4.3 · Medium EPSS 0.73% · P51

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2021-40834

Vulnerability Information
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Vulnerability Title
User interface Spoofing in F-Secure SAFE browser for Android
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
F-Secure Safe Browser 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
F-Secure Safe Browser是芬兰F-Secure公司的一款互联网安全浏览器。用于实时阻止病毒、木马、勒索软件和其他威胁。 F-secure SAFE Browser for Android 存在安全漏洞，该漏洞源于当用户单击特制的看似合法的 URL 时，SAFE 浏览器会进入全屏并隐藏用户界面。 远程攻击者可以利用它来执行欺骗攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
F-Secure F-Secure Mobile Security 18.5x ~ 17.9* -

II. Public POCs for CVE-2021-40834

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III. Intelligence Information for CVE-2021-40834

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Other References for CVE-2021-40834 (2)

IV. Related Vulnerabilities

Same product: F-Secure Mobile Security
Same vendor: F-Secure

V. Comments for CVE-2021-40834

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