FirefoxWeb browser · Mozilla
CVE-2023-34416
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 · uneditedMemory safety bugs present in Firefox 113, Firefox ESR 102.11, and Thunderbird 102.12. 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 ESR < 102.12, Firefox < 114, and Thunderbird < 102.12.
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 · moderate confidenceMultiple memory safety bugs in Firefox 113, Firefox ESR 102.11, and Thunderbird 102.12 led to memory corruption. These vulnerabilities could potentially allow arbitrary code execution with sufficient effort, given the critical 9.8 CVSS rating.
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
< 114.0
Firefox EsrWeb browser
< 102.12< 102.12CVSS 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 checksWork through these to decide whether this CVE applies to you.
-
Check Firefox versionOpen Firefox and navigate to Help > About Firefox, or enter 'about:firefox' in the address bar. Alternatively, run 'firefox --version' from command line.Affected if Version is below 114.0
-
Check Firefox ESR versionOpen Firefox ESR and navigate to Help > About Mozilla Firefox, or run 'firefox-esr --version' from command line.Affected if Version is below 102.12 and the ESR channel is in use
-
Check Thunderbird versionOpen Thunderbird and navigate to Help > About Thunderbird, or run 'thunderbird --version' from command line.Affected if Version is below 102.12
If any of these Mozilla products are installed and the installed version falls below the respective fixed version (Firefox <114.0, Firefox ESR <102.12, Thunderbird <102.12), the environment is affected.
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 · scoped102.12114.0
Update to Firefox ESR 102.12+, Firefox 114+, or Thunderbird 102.12+ to patch the memory safety vulnerabilities.
Firefox 114.0, Firefox ESR 102.12, or Thunderbird 102.12
- Identify which Mozilla product is affected (Firefox, Firefox ESR, or Thunderbird)
- For Firefox: Upgrade to version 114.0 or later
- For Firefox ESR: Upgrade to version 102.12 or later
- For Thunderbird: Upgrade to version 102.12 or later
- Restart the application after updating to apply the security patch
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
- 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 $1,984.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-34416 — 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-2023-34416 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