# CVE-2021-44751: F-Secure SAFE Browser vulnerable to USSD attacks

> Attackers can trigger unwanted USSD messages or calls via malicious websites in F-Secure SAFE Browser, potentially causing financial harm or service disruption.

- **Severity:** Medium 4.3 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 25 Mar 2022
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-7gxq-69xx-2vr4

## What is CVE-2021-44751?

CVE-2021-44751 is a medium-severity vulnerability in F-Secure SAFE Browser for Android Version 18.5 & below, published on 25 Mar 2022. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.

### Official description

A vulnerability affecting F-Secure SAFE browser was discovered. A maliciously crafted website attached with USSD code in JavaScript or iFrame can trigger dialer application from F-Secure browser which can be exploited by an attacker to send unwanted USSD messages or perform unwanted calls. In most modern Android OS, dialer application will require user interaction, however, some older Android OS may not need user interaction.

Weakness: CWE-276 (Incorrect Default Permissions)

## Which versions are affected by CVE-2021-44751?

It affects 1 product.


Products: F-Secure Safe.

## How do I fix CVE-2021-44751?

No fix has been published for CVE-2021-44751 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-44751 being exploited?

There is no known exploitation of CVE-2021-44751 in the wild and no public exploit code.

## Other vulnerabilities in F-Secure SAFE Browser for Android Version 18.5 & below

- [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-2021-44751 and fix it if it is affected.

What it is: CVE-2021-44751 is a medium-severity vulnerability in F-Secure SAFE Browser for Android Version 18.5 & below, published on 25 Mar 2022. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2021-44751 in the wild and no public exploit code.

Affected product: F-Secure SAFE Browser for Android Version 18.5 & below. 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-2021-44751/ (Markdown: https://insights.sbomify.com/CVE-2021-44751/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-44751
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-44751
- OSV: https://osv.dev/vulnerability/CVE-2021-44751

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From sbomify Insights: https://insights.sbomify.com/CVE-2021-44751/
Summaries are generated and may contain mistakes; the official description above is the record.