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FirefoxWeb browser · Mozilla

CVE-2024-2605

MEDIUM · 5.9 CVSS v3.1 Published 2024-03-19
Fix available
A fix is available. Upgrade to 115.9.0 / 124.0 or later.
See remediation →
68/100
Remediation priority · Elevated
Remotely reachable No privileges Zero-click

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
An attacker could have leveraged the Windows Error Reporter to run arbitrary code on the system escaping the sandbox. *Note:* This issue only affected Windows operating systems. Other operating systems are unaffected. This vulnerability affects Firefox < 124, Firefox ESR < 115.9, and Thunderbird < 115.9.

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

This is a sandbox escape vulnerability in Firefox, Firefox ESR, and Thunderbird on Windows operating systems. An attacker could leverage the Windows Error Reporter to escape the application sandbox and execute arbitrary code on the underlying Windows system.

MitigationUpdate to Firefox 124, Firefox ESR 115.9, or Thunderbird 115.9 or later to remediate this sandbox escape 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:< 115.9.0< 124.0
ThunderbirdApplication
Affected:< 115.9.0

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
High
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

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

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. Identify the installed Mozilla product
    Check for Firefox, Firefox ESR, or Thunderbird in the system. On Windows, common locations are C:\Program Files\Mozilla Firefox, C:\Program Files\Mozilla Firefox ESR, or C:\Program Files\Mozilla Thunderbird. Check the application icon and name in Add/Remove Programs or the application's Help > About dialog.
    Affected if The product is Firefox (any channel), Firefox ESR, or Thunderbird on Windows.
  2. Determine the installed version number
    Open the application and go to Help > About (or Firefox > Help > About). The version number will be displayed in the dialog that opens. Alternatively, check the version in the application executable properties.
    Affected if The version is below 115.9.0, or is 115.9.0 through 123.x for Firefox (both indicate versions before 124.0).
  3. Confirm the operating system is Windows
    Verify the host operating system is Windows. This vulnerability only affects Windows environments. Check System Properties or run 'systeminfo' in Command Prompt.
    Affected if The operating system is any Windows version (Windows 10, Windows 11, Windows Server).
  4. Verify the sandbox is enabled
    In Firefox or Thunderbird, type 'about:config' in the address bar and search for 'sandbox'. Check that 'security.sandbox.enabled' is set to true (the default). For Thunderbird, the setting may be under 'security.sandbox.content.enabled'.
    Affected if The sandbox is enabled (the default and typical configuration). The vulnerability exploits the sandbox, so it only applies when the sandbox is active.

You are affected if you are running Firefox (any version below 124.0), Firefox ESR (any version below 115.9.0), or Thunderbird (any version below 115.9.0) on Windows with the sandbox enabled.

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 115.9.0 / 124.0 or later
Fixed in 115.9.0124.0
Interim mitigation

Update to Firefox 124, Firefox ESR 115.9, or Thunderbird 115.9 or later to remediate this sandbox escape vulnerability.

Recommended fix High confidence

Firefox 124.0 or later / Firefox ESR 115.9.0 or later / Thunderbird 115.9.0 or later

  1. 1. Close all instances of Firefox or Thunderbird
  2. 2. Navigate to the official Mozilla download page at https://www.mozilla.org/
  3. 3. Download Firefox 124.0 (or Firefox ESR 115.9.0 for enterprise deployments) or Thunderbird 115.9.0 depending on your installed product
  4. 4. Run the downloaded installer and follow the prompts to complete the update
  5. 5. Alternatively, open Firefox/Thunderbird and go to Help > About to trigger automatic update checking
  6. 6. Verify the installed version by checking Help > About to confirm version 124.0 (Firefox), 115.9.0 (Firefox ESR), or 115.9.0 (Thunderbird)

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

Fix this in Firefox Scoped from the published advisory
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing2.0 h
  • Review / QA1.0 h
9.0 hours of engineering $1,600
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Scan for this in your stack

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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-2024-2605 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