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FirefoxWeb browser · Mozilla

CVE-2024-1553

HIGH · 8.1 CVSS v3.1 Published 2024-02-20
Fix available
A fix is available. Upgrade to 115.8.0 / 123.0 or later.
See remediation →
90/100
Remediation priority · Urgent
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 bugs present in Firefox 122, Firefox ESR 115.7, and Thunderbird 115.7. 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 < 123, Firefox ESR < 115.8, and Thunderbird < 115.8.

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 122, Firefox ESR 115.7, and Thunderbird 115.7 lead to memory corruption that could potentially be exploited for arbitrary code execution. The vulnerability affects multiple Mozilla products and is addressed by upgrading to Firefox 123, Firefox ESR 115.8, or Thunderbird 115.8.

MitigationApply the vendor-supplied patches by upgrading to Firefox 123+, Firefox ESR 115.8+, or Thunderbird 115.8+ as appropriate for the affected deployment.

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:< 115.8.0< 123.0
Debian LinuxOperating system
Affected:= 10.0
ThunderbirdApplication
Affected:< 115.8.0

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

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 installed Mozilla product
    Check which Mozilla application is installed: look for 'firefox', 'firefox-esr', or 'thunderbird' in installed programs or running processes
    Affected if No Mozilla product is installed (not affected)
  2. Determine Firefox version
    For Firefox: Run 'firefox --version' or check Help > About Firefox. For Firefox ESR: Run 'firefox-esr --version' or check Help > About Firefox ESR
    Affected if Version is less than 115.8.0, or between 115.8.0 and 122.0 (inclusive of 122.0 but less than 123.0)
  3. Determine Thunderbird version
    Run 'thunderbird --version' or check Help > About Thunderbird
    Affected if Version is less than 115.8.0
  4. Confirm Debian 10 package version if applicable
    If on Debian 10, check installed package version with 'dpkg -l | grep -E firefox|thunderbird'
    Affected if Package version corresponds to vulnerable Firefox/Thunderbird versions as determined above

User is affected if Firefox (including ESR) version is below 115.8.0 or is 122.x (below 123.0), or if Thunderbird version is below 115.8.0

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 115.8.0 / 123.0 or later
Fixed in 115.8.0123.0
Interim mitigation

Apply the vendor-supplied patches by upgrading to Firefox 123+, Firefox ESR 115.8+, or Thunderbird 115.8+ as appropriate for the affected deployment.

Recommended fix High confidence

Firefox 123.0+ / Firefox ESR 115.8.0+ / Thunderbird 115.8.0+

  1. Check current Firefox version: Help > About Firefox (or firefox --version)
  2. Check current Thunderbird version: Help > About Thunderbird (or thunderbird --version)
  3. Upgrade Firefox to version 123.0 or later (or Firefox ESR 115.8.0 or later for enterprise deployments)
  4. Upgrade Thunderbird to version 115.8.0 or later
  5. Restart the applications after upgrade
  6. Verify the version has been updated successfully
Caveat Major browser updates may temporarily affect compatibility with some extensions or older website features; test critical workflows after upgrade

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
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,560.

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-2024-1553 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