CVE-2021-33596

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

3.5 Low

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: Low
User interaction: Required

What an attacker can affect

Confidentiality: None
Integrity: Low
Availability: None

Exploit likelihood

0.80%Up 0.1 points since Aug 6, 2021

What each source reports

CVE List Score used 3.5

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

Record: CVE-2021-33596
CVSS 3.1: 3.5 LowCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
Updated: 2026-11-02

EUVDEUVD-2021-20280 3.5

Record: EUVD-2021-20280
CVSS 3.1: 3.5 LowCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
Updated: 2026-11-03

GitHub AdvisoriesGHSA-p3hp-p5r4-h3gq No score

Showing the legitimate URL in the address bar while loading the content from other domain. This...

Record: GHSA-p3hp-p5r4-h3gq
Weakness: CWE-1021
Updated: 2026-11-02

NVD 3.5

Record: CVE-2021-33596
CVSS 3.1: 3.5 LowCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
CVSS 3.1: 4.1 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N
CVSS 2.0: 3.5 LowAV:N/AC:M/Au:S/C:N/I:P/A:N
Weakness: CWE-1021
Updated: 2026-11-02

Affected products

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-33596 is a low vulnerability (CVSS 3.5) in F-secure Safe, published August 5, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.80%, the 56th percentile. No source names a fixed version.