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FirefoxWeb browser · Mozilla

CVE-2024-0755

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
Memory safety bugs present in Firefox 121, Firefox ESR 115.6, and Thunderbird 115.6. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. 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

Memory safety bugs in Firefox 121, Firefox ESR 115.6, and Thunderbird 115.6 allow memory corruption, which with sufficient effort could be exploited for arbitrary code execution.

MitigationUpdate to Firefox 122, Firefox ESR 115.7, Thunderbird 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
    Run 'firefox --version' or go to Help > About Firefox to view the installed version number
    Affected if Version is 121.x or below (less than 122.0)
  2. Check Firefox ESR version
    Run 'firefox --version' or go to Help > About Firefox to view the installed version number; ESR versions typically include 'ESR' in the about dialog
    Affected if Version is 115.6 or below (less than 115.7)
  3. Check Thunderbird version
    Run 'thunderbird --version' or go to Help > About Thunderbird to view the installed version number
    Affected if Version is 115.6 or below (less than 115.7)
  4. Check Debian Linux version
    Run 'cat /etc/debian_version' to identify the Debian release
    Affected if Running Debian 10.0 and using affected Mozilla products

You are affected if any Firefox, Firefox ESR, or Thunderbird installation on Debian 10.0 is below the fixed versions (122.0, 115.7, 115.7 respectively).

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

Recommended fix High confidence

Firefox 122.0, Firefox ESR 115.7, Thunderbird 115.7

  1. Check current Firefox version by navigating to Menu > Help > About Firefox (or Firefox ESR)
  2. Check current Thunderbird version by navigating to Menu > Help > About Thunderbird
  3. For Firefox: Download Firefox 122.0 or later from https://www.mozilla.org/firefox/
  4. For Firefox ESR: Download Firefox ESR 115.7 or later from https://www.mozilla.org/firefox/enterprise/
  5. For Thunderbird: Download Thunderbird 115.7 or later from https://www.mozilla.org/thunderbird/
  6. Alternatively, use your system's package manager to update (e.g., apt update && apt install firefox-esr thunderbird)
  7. Restart the application after update
  8. Verify the version now shows 122.0+ (Firefox) or 115.7+ (Firefox ESR/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

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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-2024-0755 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