dbcve.org
FirefoxWeb browser · Mozilla

CVE-2024-0751

HIGH · 8.8 CVSS v3.1 Published 2024-01-23
Fix available
A fix is available. Upgrade to 115.7 / 122.0 or later.
See remediation →
95/100
Remediation priority · Urgent
Remotely reachable No privileges

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

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

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

A vulnerability in Firefox, Firefox ESR, and Thunderbird allows a malicious devtools extension to escalate privileges beyond its intended sandbox. The devtools extension API improperly permissions checks, enabling a malicious extension to perform actions that should be restricted.

MitigationUpdate Firefox to version 122 or later, Firefox ESR to 115.7 or later, and Thunderbird to 115.7 or later to remediate this vulnerability.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
FirefoxWeb browser
Affected:< 122.0
Firefox EsrWeb browser
Affected:< 115.7
Debian LinuxOperating system
Affected:= 10.0
ThunderbirdApplication
Affected:< 115.7

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Check Firefox version
    Open Firefox, go to Help > About Firefox (or navigate to about:support), or run 'firefox --version' from command line
    Affected if The displayed version is below 122.0 (e.g., 121.x or earlier)
  2. Check Firefox ESR version
    Open Firefox ESR, go to Help > About Firefox ESR, or run 'firefox-esr --version' from command line
    Affected if The displayed version is below 115.7 (e.g., 115.6.x or earlier)
  3. Check Thunderbird version
    Open Thunderbird, go to Help > About Thunderbird, or run 'thunderbird --version' from command line
    Affected if The displayed version is below 115.7 (e.g., 115.6.x or earlier)
  4. Verify devtools extension usage
    In Firefox/Thunderbird, go to about:addons, click the gear icon, then 'Manage Extension Shortcuts' or inspect currently loaded devtools extensions via about:debugging
    Affected if Any untrusted or unsigned devtools extension is installed and enabled (the vulnerability allows malicious extensions to bypass sandbox restrictions)
  5. Check Debian package version (if applicable)
    Run 'dpkg -l | grep -i firefox' or 'apt policy firefox' on Debian systems
    Affected if The installed Firefox package version corresponds to a release before 122.0

You are affected if you run Firefox below 122.0, Firefox ESR below 115.7, or Thunderbird below 115.7 AND have untrusted devtools extensions installed, as the privilege escalation only applies in that context.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 115.7 / 122.0 or later
Fixed in 115.7122.0
Interim mitigation

Update Firefox to version 122 or later, Firefox ESR to 115.7 or later, and Thunderbird to 115.7 or later to remediate this vulnerability.

Recommended fix High confidence

Firefox 122.0, Firefox ESR 115.7, or Thunderbird 115.7

  1. If using Firefox, upgrade to Firefox 122.0 or later
  2. If using Firefox ESR, upgrade to Firefox ESR 115.7 or later
  3. If using Thunderbird, upgrade to Thunderbird 115.7 or later
  4. After upgrading, verify the version by checking Help > About (Firefox) or Help > About Thunderbird

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Firefox Scoped from the published advisory
  • Consultation1.0 h
  • Implementation2.0 h
  • Testing1.0 h
  • Review / QA1.0 h
5.0 hours of engineering $890
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,424.

Scan for this in your stack

Free · runs locally
dbcve dependency scanner

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2024-0751 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data