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FirefoxWeb browser · Mozilla

CVE-2024-3864

HIGH · 8.1 CVSS v3.1 Published 2024-04-16
Fix available
A fix is available. Upgrade to 115.10.0 / 125.0 or later.
See remediation →
90/100
Remediation priority · Urgent
Public exploit 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
Memory safety bug present in Firefox 124, Firefox ESR 115.9, and Thunderbird 115.9. This bug showed evidence of memory corruption and we presume that with enough effort this could have been exploited to run arbitrary code. This vulnerability affects Firefox < 125, Firefox ESR < 115.10, and Thunderbird < 115.10.

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
How this class of weakness works · CWE-119

The program reads or writes outside the bounds of an allocated buffer, corrupting adjacent memory. With crafted input an attacker can overwrite control data and, with effort, redirect execution to their own code. Remediation ranges from bounds checking and safe library functions to compiler mitigations, usually alongside a careful audit of the surrounding code.

General guidance for the memory buffer bounds error class — the official description and references above are authoritative for this specific CVE. Want a bespoke review and a reviewed fix? Ask our team →

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:< 115.10.0< 125.0
Debian LinuxOperating system
Affected:= 10.0
ThunderbirdApplication
Affected:< 115.10.0

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
High
Integrity
High
Availability
High

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

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 115.10.0 / 125.0 or later
Fixed in 115.10.0125.0
Recommended fix High confidence

Firefox 125+ (mainline), Firefox ESR 115.10+ (extended support), Thunderbird 115.10+

  1. Identify the installed Firefox/Thunderbird version by navigating to Help > About (or running 'firefox --version' or 'thunderbird --version' in terminal)
  2. For Debian 10 (Bullseye), check if the system has access to updated Mozilla packages from backports or consider upgrading to a supported Debian release
  3. If using Firefox mainline, upgrade to version 125 or later
  4. If using Firefox ESR, upgrade to version 115.10 or later
  5. If using Thunderbird, upgrade to version 115.10 or later
  6. On Linux systems, use package manager: 'apt-get update && apt-get upgrade firefox' or 'apt-get upgrade thunderbird'
  7. Restart the browser/application after upgrade completes
  8. Verify the new version is installed by checking Help > About
Caveat Major version upgrades may introduce UI changes, remove support for older extensions, or alter sync behavior; ensure extension compatibility before upgrading in enterprise environments

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

We can perform the upgrade in your staging environment and verify nothing breaks — typical engagement from $3,200. Get the upgrade done

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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-2024-3864 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