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FirefoxWeb browser · Mozilla

CVE-2023-28176

HIGH · 8.8 CVSS v3.1 Published 2023-06-02
Fix available
A fix is available. Upgrade to 102.9 / 111.0 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
Memory safety bugs present in Firefox 110 and Firefox ESR 102.8. 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 < 111, Firefox ESR < 102.9, and Thunderbird < 102.9.

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 confidence

Memory safety vulnerabilities in Firefox 110 and Firefox ESR 102.8 that could allow arbitrary code execution via memory corruption. The specific memory safety bugs (likely including use-after-free, buffer overflows, or similar issues) affect Firefox < 111, Firefox ESR < 102.9, and Thunderbird < 102.9.

MitigationUpdate to Firefox 111+, Firefox ESR 102.9+, or Thunderbird 102.9+ to patch the memory corruption vulnerabilities.

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:< 111.0
Firefox EsrWeb browser
Affected:< 102.9
ThunderbirdApplication
Affected:< 102.9

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. Identify installed Mozilla Firefox version
    Open Firefox, click Help > About Firefox, or navigate to about:support in the address bar, or run 'firefox --version' from command line
    Affected if The displayed version is below 111.0 (for example, 110.x or earlier)
  2. Identify installed Mozilla Firefox ESR version
    Open Firefox ESR, click Help > About Firefox ESR, or navigate to about:support, or run 'firefox-esr --version' from command line
    Affected if The displayed version is below 102.9 (for example, 102.8 or earlier)
  3. Identify installed Mozilla Thunderbird version
    Open Thunderbird, click Help > About Thunderbird, or run 'thunderbird --version' from command line
    Affected if The displayed version is below 102.9 (for example, 102.8 or earlier)
  4. Confirm multiple Mozilla products installed
    Check for multiple Mozilla applications on the system using system package manager (dpkg -l, rpm -qa, or similar) or by inspecting installed programs directory
    Affected if More than one of Firefox, Firefox ESR, or Thunderbird is installed and any version is below the fixed releases

You are affected if any installed instance of Firefox (any channel), Firefox ESR, or Thunderbird shows a version number lower than 111.0, 102.9, or 102.9 respectively.

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 102.9 / 111.0 or later
Fixed in 102.9111.0
Interim mitigation

Update to Firefox 111+, Firefox ESR 102.9+, or Thunderbird 102.9+ to patch the memory corruption vulnerabilities.

Recommended fix High confidence

Firefox 111.0+, Firefox ESR 102.9+, Thunderbird 102.9+

  1. For Firefox: Navigate to Menu > Help > About Firefox to check current version, then update to 111.0 or later
  2. For Firefox ESR: Check current version via Menu > Help > About Firefox ESR, then update to 102.9 or later
  3. For Thunderbird: Navigate to Menu > Help > About Thunderbird to check current version, then update to 102.9 or later
  4. Alternatively, download the latest stable version from the official Mozilla website (www.mozilla.org) for your platform
  5. Ensure automatic updates are enabled for future security patches
Caveat Minor compatibility issues may occur with older extensions or add-ons; some legacy features deprecated in newer versions

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

Fix this in Firefox Scoped from the published advisory
  • Consultation1.0 h
  • Implementation1.0 h
  • Testing1.0 h
  • Review / QA1.0 h
4.0 hours of engineering $750
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,200.

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-2023-28176 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