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CVE-2021-33596

Fake Apple login prompt in F-Secure SAFE browser for iOS

MEDIUM
4.1
CVSS Score
Published: August 5, 2021 at 07:26 PM UTC
Updated: June 17, 2026 at 03:54 AM UTC
2 products affected across 1 vendorSafeSecure Safe

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Severity
MEDIUM4.1
Exploit prediction
EPSS 0.8%

Description

Showing the legitimate URL in the address bar while loading the content from other domain. This makes the user believe that the content is served by a legit domain. Exploiting the vulnerability requires the user to click on a specially crafted, seemingly legitimate URL containing an embedded malicious redirect while using F-Secure Safe Browser for iOS.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Safe· F Secure
95%
v < 18.4.272901
Affected range stops below 18.4.272901, so it looks safe — our inference, not a vendor statement
Secure Safe· F Secure
60%
18.3x ≤ v < 18.4x18.3x
Affected range stops below 18.4x, so it looks safe — our inference, not a vendor statement

References (3)

x_refsource_MISCVendor Advisory
Source: [email protected]
https://www.f-secure.com/en/business/programs/vulnerability-reward-program/hall-of-fame
x_refsource_MISCVendor Advisory
Source: [email protected]
https://www.f-secure.com/en/business/support-and-downloads/security-advisories
x_refsource_MISCVendor Advisory
Source: [email protected]
https://www.f-secure.com/en/business/support-and-downloads/security-advisories/cve-2021-33596

CVSS

4.1MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
NONE
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-1021

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