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FirefoxWeb browser · Mozilla

CVE-2023-29531

CRITICAL · 9.8 CVSS v3.1 Published 2023-06-19
Fix available
A fix is available. Upgrade to 102.10 / 112.0 or later.
See remediation →
100/100
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
An attacker could have caused an out of bounds memory access using WebGL APIs, leading to memory corruption and a potentially exploitable crash. *This bug only affects Firefox and Thunderbird for macOS. Other operating systems are unaffected.* This vulnerability affects Firefox < 112, Firefox ESR < 102.10, and Thunderbird < 102.10.

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 · high confidence

A WebGL API vulnerability in Firefox and Thunderbird on macOS allows attackers to cause out-of-bounds memory access, leading to memory corruption and potentially exploitable crashes. The issue stems from insufficient bounds checking in WebGL rendering operations.

MitigationUpdate affected software to Firefox 112+, Firefox ESR 102.10+, or Thunderbird 102.10+ to patch the vulnerability. Deploy updates via MDM or software distribution tools for macOS systems.

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:< 112.0
Firefox EsrWeb browser
Affected:< 102.10
ThunderbirdApplication
Affected:< 102.10

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
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/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. Check Firefox version
    Open Firefox, click Firefox menu > About Firefox, or run: /Applications/Firefox.app/Contents/MacOS/firefox --version
    Affected if The version shown is below 112.0 (for example, 111.0 or earlier)
  2. Check Firefox ESR version
    Open Firefox ESR, click Firefox menu > About Firefox ESR, or run: /Applications/Firefox ESR.app/Contents/MacOS/firefox --version
    Affected if The version shown is below 102.10 (for example, 102.9 or earlier)
  3. Check Thunderbird version
    Open Thunderbird, click Thunderbird menu > About Thunderbird, or run: /Applications/Thunderbird.app/Contents/MacOS/thunderbird --version
    Affected if The version shown is below 102.10 (for example, 102.9 or earlier)
  4. Confirm WebGL is accessible in the browser
    In Firefox, type about:support in the address bar and search for WebGL Renderer. Alternatively, visit a site like webgl.org to verify WebGL renders correctly.
    Affected if WebGL renders successfully - this confirms the vulnerable code path is present and usable

You are affected if any installed Firefox version is below 112.0, any Firefox ESR is below 102.10, or any Thunderbird is below 102.10, and WebGL is functional in the browser.

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 102.10 / 112.0 or later
Fixed in 102.10112.0
Interim mitigation

Update affected software to Firefox 112+, Firefox ESR 102.10+, or Thunderbird 102.10+ to patch the vulnerability. Deploy updates via MDM or software distribution tools for macOS systems.

Recommended fix High confidence

Firefox 112.0, Firefox ESR 102.10, or Thunderbird 102.10 (or later)

  1. 1. Identify the installed Mozilla product (Firefox, Firefox ESR, or Thunderbird) and current version via About menu or application info
  2. 2. For Firefox: Navigate to Help > About Firefox to check version
  3. 3. For Thunderbird: Navigate to Help > About Thunderbird to check version
  4. 4. If version is below 112.0 (Firefox) or below 102.10 (Firefox ESR/Thunderbird), initiate update via Help > Check for Updates
  5. 5. Alternatively, download the latest version from the official Mozilla website: https://www.mozilla.org/
  6. 6. Restart the application after update completes
  7. 7. Verify the updated version meets the fixed release threshold (Firefox 112.0+, Firefox ESR 102.10+, Thunderbird 102.10+)
  8. 8. Note: This vulnerability only affects macOS; Windows and Linux users are unaffected

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-2023-29531 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