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CVE-2021-33594: An address bar spoofing vulnerability was discovered in Safe Browser for Android

28
Routine
LOW 3.5UPGRADE

CVE-2021-33594 is a low-severity flaw (CVSS 3.5) affecting safe. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

  • No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score3.5 (Low)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededLow
User interactionRequired
EPSS exploit chance1.1% (top 35%)
CISA exploited listNo
Published2021-08-11
Last modified2026-06-17
Publisher (CNA): F-Secure · Vendor: f-secure

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Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

f-secure safe UPGRADE
Affected: < 18.4.0
Fixed in: 18.4.0
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy safe || rpm -q safe || safe --version
2. UPGRADE to 18.4.0 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade safe
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade safe
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-33594?

safe: upgrade to 18.4.0. Exact commands for each OS are on this page.

Is CVE-2021-33594 being exploited?

CVE-2021-33594 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-33594 affect?

CVE-2021-33594 affects safe. Severity is low (CVSS 3.5). 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 pr

How urgent is CVE-2021-33594?

Priority 28/100. No elevated risk signals yet.

Software pages

Android vulnerabilities

Related CVEs

References

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