FirefoxWeb browser · Mozilla
CVE-2023-4057
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 115, Firefox ESR 115.0, and Thunderbird 115.0. 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 < 116, Firefox ESR < 115.1, and Thunderbird < 115.1.
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 · moderate confidenceMultiple memory safety vulnerabilities in Firefox 115, Firefox ESR 115.0, and Thunderbird 115.0 allow memory corruption that can potentially be leveraged to execute arbitrary code. The specific vulnerability types are not detailed, but memory safety issues in browser rendering engines typically include buffer overflows, use-after-free, or similar memory manipulation flaws.
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
< 116.0
Firefox EsrWeb browser
< 115.1CVSS 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.
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Identify the installed Mozilla browserOpen the application and go to Help > About Firefox, or check your installed programs list to confirm whether you have standard Firefox or Firefox ESRAffected if The installed product is Mozilla Firefox or Mozilla Firefox ESR
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Check the Firefox version numberIn the About Firefox dialog, read the full version string shown (for ESR versions, the string includes 'ESR', e.g., 115.0.x)Affected if A version number is displayed in the About window
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Compare against affected version rangesFor standard Firefox: verify if the version is less than 116.0. For Firefox ESR: verify if the version is less than 115.1Affected if Firefox is below version 116.0 OR Firefox ESR is below version 115.1
Your environment is affected if the installed Firefox version is lower than 116.0 or the installed Firefox ESR version is lower than 115.1.
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 · scoped115.1116.0
Upgrade to Firefox 116+, Firefox ESR 115.1+, or Thunderbird 115.1+ to obtain the vendor patch addressing these memory safety issues.
Firefox 116.0 or Firefox ESR 115.1
- Upgrade Firefox to version 116.0 or later by checking for updates via Help > About Firefox > Update
- If using Firefox ESR, upgrade to version 115.1 or later via your organization's update mechanism
- Alternatively, download and install the latest version from https://www.mozilla.org/firefox/ or https://www.mozilla.org/en-US/firefox/organizations/
- Restart the browser after updating to apply the changes
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
- 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 $2,560.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-4057 — 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-2023-4057 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
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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