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FirefoxWeb browser · Mozilla

CVE-2024-7522

HIGH · 8.8 CVSS v3.1 Published 2024-08-06
Fix available
A fix is available. Upgrade to 115.14.0 / 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
Editor code failed to check an attribute value. This could have led to an out-of-bounds read. This vulnerability affects Firefox < 129, Firefox ESR < 115.14, Firefox ESR < 128.1, Thunderbird < 128.1, and Thunderbird < 115.14.

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 memory safety vulnerability exists in the Firefox and Thunderbird editor component where attribute value validation is insufficient, leading to an out-of-bounds read. This could allow attackers to read sensitive memory contents, potentially facilitating information disclosure or exploit development.

MitigationUpdate affected installations to Firefox 129 (or ESR 128.1/115.14) and Thunderbird 128.1 (or 115.14) or later versions to apply the patched editor code.

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:< 115.14.0= 128.0
ThunderbirdApplication
Affected:< 115.14.0= 128.0.1

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
    Open Firefox, click the menu button (three horizontal lines), select Help, then About Firefox. The version number will display in the window that opens.
    Affected if The displayed version is less than 129.0, or is exactly 128.0 (ESR), or is an ESR version less than 115.14.0
  2. Check Thunderbird version
    Open Thunderbird, click the menu button, select Help, then About Thunderbird. The version number will display in the window that opens.
    Affected if The displayed version is less than 115.14.0, or is exactly 128.0.1
  3. Check Firefox ESR version details
    In Firefox, navigate to about:support or go to Help > About Firefox. Look for the text indicating 'ESR' or Extended Support Release alongside the version number.
    Affected if The version shows as ESR 128.0 (any minor version) or ESR versions below 115.14.0
  4. Verify editor component usage
    The vulnerability exists in the editor component used for rich text editing. If you use Firefox or Thunderbird to compose or edit HTML-formatted content, the editor component is active.
    Affected if You regularly compose or edit content using the built-in editor in affected Firefox or Thunderbird versions

You are affected if you have Firefox versions below 129.0, Firefox ESR 128.0 or below 115.14.0, or Thunderbird versions below 115.14.0 or exactly 128.0.1, and use the editor component for composing or editing content.

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 115.14.0 / 129.0 or later
Fixed in 115.14.0129.0
Interim mitigation

Update affected installations to Firefox 129 (or ESR 128.1/115.14) and Thunderbird 128.1 (or 115.14) or later versions to apply the patched editor code.

Recommended fix High confidence

Firefox 129.0, Firefox ESR 115.14.0 or 128.1, Thunderbird 115.14.0 or 128.1 (depending on current branch)

  1. Check current Firefox, Firefox ESR, or Thunderbird version via Help > About (or running 'firefox --version')
  2. Download the appropriate fixed version from the official Mozilla website: https://www.mozilla.org/
  3. For Firefox: upgrade to version 129.0
  4. For Firefox ESR: upgrade to version 115.14.0 (if on 115.x branch) or 128.1 (if on 128.x branch)
  5. For Thunderbird: upgrade to version 115.14.0 (if on 115.x branch) or 128.1 (if on 128.x branch)
  6. Restart the application after installation

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

Fix this in Firefox Scoped from the published advisory
  • Consultation2.0 h
  • Implementation2.0 h
  • Testing1.0 h
  • Review / QA1.0 h
6.0 hours of engineering $1,090
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,744.

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-2024-7522 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