FirefoxWeb browser · Mozilla
CVE-2023-29536
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 · uneditedAn attacker could cause the memory manager to incorrectly free a pointer that addresses attacker-controlled memory, resulting in an assertion, memory corruption, or a potentially exploitable crash. This vulnerability affects Firefox < 112, Focus for Android < 112, Firefox ESR < 102.10, Firefox for Android < 112, 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 confidenceA memory management flaw in Firefox and related products allows an attacker to cause the memory manager to incorrectly free a pointer that addresses attacker-controlled memory, leading to assertion failures, memory corruption, or potentially exploitable crashes.
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
< 112.0
Firefox EsrWeb browser
< 102.10< 112.0< 102.10CVSS 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 checksWork through these to decide whether this CVE applies to you.
-
Identify installed Mozilla productOpen the application and go to Help > About [Product Name], or check the installed version via command line: on Windows check Program Files, on macOS check /Applications, on Linux check your package managerAffected if The installed product is Firefox, Firefox ESR, Focus, or Thunderbird
-
Determine Firefox versionIn Firefox, navigate to Help > About Firefox, or enter 'about:support' in the address barAffected if Version is below 112.0 (for example, 111.x or earlier)
-
Determine Firefox ESR versionIn Firefox ESR, navigate to Help > About Firefox, or enter 'about:support' in the address barAffected if Version is below 102.10 (for example, 102.9.x or earlier)
-
Determine Thunderbird versionIn Thunderbird, navigate to Help > About Thunderbird, or enter 'about:support' in the address barAffected if Version is below 102.10 (for example, 102.9.x or earlier)
-
Determine Focus for Android versionOpen the Google Play Store app, go to My apps & games, find Focus, and check the version number listedAffected if Version is below 112.0 (for example, 111.x or earlier)
Your environment is affected if any installed Mozilla product (Firefox, Firefox ESR, Focus, or Thunderbird) has a version number lower than 112.0 or 102.10 respectively.
Generated from the published advisory. Verify against your own configuration.
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 · scoped102.10112.0
Update to Firefox 112, Firefox ESR 102.10, Firefox for Android 112, Focus for Android 112, Thunderbird 102.10, or later versions to patch this vulnerability.
Firefox 112.0, Firefox ESR 102.10, Focus 112.0, Thunderbird 102.10
- Upgrade Firefox to version 112.0 or later
- Upgrade Firefox ESR to version 102.10 or later
- Upgrade Focus for Android to version 112.0 or later
- Upgrade Thunderbird to version 102.10 or later
- For Firefox for Android, upgrade to version 112.0 or later
Generated from the published advisory — verify against the referenced sources before acting.
Fix this in Firefox
Scoped from the published advisory
- Consultation2.0 h
- Implementation3.0 h
- Testing2.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,272.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-29536 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2023-29536 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
Be the first to add a field note for this CVE — a mitigation you’ve verified, a version caveat, or a link to a working fix. Sign in above to contribute.
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.
- 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