# CVE-2021-33594: F-Secure Safe browser for Android vulnerable to Address Bar Spoofing

> Attackers can spoof the address bar in F-Secure Safe Browser for Android, misleading users about the true source of displayed content.

- **Severity:** Low 3.5 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 11 Aug 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-w9rw-g2g4-x27x

## What is CVE-2021-33594?

CVE-2021-33594 is a low-severity vulnerability in F-Secure Mobile Security, published on 11 Aug 2021. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

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.

## Which versions are affected by CVE-2021-33594?

It affects 1 product.


Products: F-Secure Safe.

## How do I fix CVE-2021-33594?

No fix has been published for CVE-2021-33594 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-33594 being exploited?

There is no known exploitation of CVE-2021-33594 in the wild and no public exploit code.

## Other vulnerabilities in F-Secure Mobile Security

- [CVE-2020-14977](https://insights.sbomify.com/CVE-2020-14977/): Race condition in n/a (high 8.1)
- [CVE-2020-14978](https://insights.sbomify.com/CVE-2020-14978/): Privilege escalation in n/a (high 8.1)
- [CVE-2022-38164](https://insights.sbomify.com/CVE-2022-38164/): Security feature bypass in n/a (medium 6.5)
- [CVE-2021-44748](https://insights.sbomify.com/CVE-2021-44748/): Universal Cross-Site Scripting Vulnerability in F-Secure SAFE Browser for Android (medium 5.5)
- [CVE-2021-44749](https://insights.sbomify.com/CVE-2021-44749/): Universal Cross-Site Scripting Vulnerability in F-Secure SAFE Browser Protection for Android (medium 5.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-33594 and fix it if it is affected.

What it is: CVE-2021-33594 is a low-severity vulnerability in F-Secure Mobile Security, published on 11 Aug 2021. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2021-33594 in the wild and no public exploit code.

Affected product: F-Secure Mobile Security. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2021-33594/ (Markdown: https://insights.sbomify.com/CVE-2021-33594/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-33594
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-33594
- OSV: https://osv.dev/vulnerability/CVE-2021-33594

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-33594/
Summaries are generated and may contain mistakes; the official description above is the record.