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FirefoxWeb browser · Mozilla

CVE-2024-7528

HIGH · 8.8 CVSS v3.1 Published 2024-08-06
Fix available
A fix is available. Upgrade to 128.1.0 / 129.0 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
Incorrect garbage collection interaction in IndexedDB could have led to a use-after-free. This vulnerability affects Firefox < 129, Firefox ESR < 128.1, and Thunderbird < 128.1.

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 use-after-free vulnerability in Firefox and Thunderbird's IndexedDB implementation, caused by incorrect garbage collection interaction. An attacker could potentially exploit this to execute arbitrary code by triggering the garbage collection bug when manipulating IndexedDB transactions.

MitigationUpdate affected systems to Firefox 129+, Firefox ESR 128.1+, or Thunderbird 128.1+ to patch the 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:< 129.0
Firefox EsrWeb browser
Affected:< 128.1.0
ThunderbirdApplication
Affected:< 128.1.0

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
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. Identify the installed Mozilla product
    Open the application and go to Help > About (Firefox or Thunderbird). The product name and version will be displayed in the window that opens.
    Affected if The product is Firefox or Thunderbird with a version below the fixed releases.
  2. Confirm Firefox version
    In the Firefox address bar, type about:support and press Enter. Locate the 'Version' field in the displayed information.
    Affected if Firefox version is less than 129.0 (e.g., 128.x or earlier).
  3. Confirm Firefox ESR version
    In the Firefox address bar, type about:support and press Enter. Locate the 'Version' field. ESR versions typically include 'ESR' in the version string.
    Affected if Firefox ESR version is less than 128.1.0.
  4. Confirm Thunderbird version
    In Thunderbird, go to Help > About Thunderbird. The version number is displayed in the dialog window.
    Affected if Thunderbird version is less than 128.1.0.
  5. Verify IndexedDB usage (context only)
    IndexedDB is a browser storage API used by web applications. There is no single config file to check; the vulnerability triggers when web pages interact with IndexedDB transactions while garbage collection occurs.
    Affected if The browser is used to run or visit untrusted web content that utilizes IndexedDB - this is the attack surface for exploiting the use-after-free.

A user is affected if they are running any version of Firefox below 129.0, Firefox ESR below 128.1.0, or Thunderbird below 128.1.0, and they browse web content that accesses IndexedDB.

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 128.1.0 / 129.0 or later
Fixed in 128.1.0129.0
Interim mitigation

Update affected systems to Firefox 129+, Firefox ESR 128.1+, or Thunderbird 128.1+ to patch the vulnerability.

Recommended fix High confidence

Firefox 129.0+, Firefox ESR 128.1.0+, Thunderbird 128.1.0+

  1. Check current version of Mozilla product (Firefox or Thunderbird) via Help > About
  2. For Firefox: Upgrade to version 129.0 or later
  3. For Firefox ESR: Upgrade to version 128.1.0 or later
  4. For Thunderbird: Upgrade to version 128.1.0 or later
  5. Restart the application after update
Caveat Standard upgrade considerations apply - review add-on compatibility and sync data before upgrading

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
  • Testing3.0 h
  • Review / QA1.0 h
10.0 hours of engineering $1,750
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,800.

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-2024-7528 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