dbcve.org
Firefox EsrWeb browser · Mozilla

CVE-2023-25746

HIGH · 8.8 CVSS v3.1 Published 2023-06-02
Fix available
A fix is available. Upgrade to 102.8 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 ESR 102.7. 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 Thunderbird < 102.8 and Firefox ESR < 102.8.

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

Memory safety bugs in Firefox ESR 102.7 and Thunderbird versions before 102.8 could allow arbitrary code execution through memory corruption. The vulnerabilities stem from memory corruption issues that could be exploited with sufficient effort.

MitigationUpgrade to Firefox ESR 102.8 or later and Thunderbird 102.8 or later to apply the security patches.

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
Firefox EsrWeb browser
Affected:< 102.8
ThunderbirdApplication
Affected:< 102.8

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. Check if Firefox ESR is installed
    Locate Firefox ESR installation on the system (common paths: Windows: C:\Program Files\Mozilla Firefox\, Linux: /usr/lib/firefox/, macOS: /Applications/Firefox.app/). Check the version by examining application metadata or running 'firefox --version' if accessible.
    Affected if Firefox ESR version is found to be below 102.8
  2. Check installed Firefox ESR version number
    Open Firefox ESR, go to Help > About, or check the application version file/information in the installation directory. On Windows, version may also be in registry under HKLM\SOFTWARE\Mozilla\Mozilla Firefox.
    Affected if The displayed version is any version less than 102.8 (for example, 102.7, 102.6, etc.)
  3. Check if Thunderbird is installed
    Locate Thunderbird installation on the system (common paths: Windows: C:\Program Files\Mozilla Thunderbird\, Linux: /usr/lib/thunderbird/, macOS: /Applications/Thunderbird.app/). Check the version by examining application metadata or running 'thunderbird --version' if accessible.
    Affected if Thunderbird version is found to be below 102.8
  4. Verify Thunderbird version against affected range
    Open Thunderbird, go to Help > About, or check the application version file/information in the installation directory. On Windows, version may also be in registry under HKLM\SOFTWARE\Mozilla\Mozilla Thunderbird.
    Affected if The displayed version is any version less than 102.8 (for example, 102.7, 102.6, etc.)

A user is affected if either Mozilla Firefox ESR or Mozilla Thunderbird is installed with a version number lower than 102.8.

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 102.8 or later
Fixed in 102.8
Interim mitigation

Upgrade to Firefox ESR 102.8 or later and Thunderbird 102.8 or later to apply the security patches.

Recommended fix High confidence

Firefox ESR 102.8 and Thunderbird 102.8

  1. For Firefox ESR: Navigate to Help > About Firefox > Check for Updates, or download Firefox ESR 102.8 from the official Mozilla website
  2. For Thunderbird: Navigate to Help > About Thunderbird > Check for Updates, or download Thunderbird 102.8 from the official Mozilla website
  3. After updating, restart the application to complete the upgrade
  4. Verify the installed version by checking Help > About to confirm version 102.8 or later is running
Caveat Minor version upgrade within ESR 102.x branch - minimal risk; ensure email profiles are backed up before updating as a precaution

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

Fix this in Firefox Esr Scoped from the published advisory
  • Consultation2.0 h
  • Implementation2.0 h
  • Testing2.0 h
  • Review / QA1.0 h
7.0 hours of engineering $1,240
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,984.

Scan for this in your stack

Free · runs locally
dbcve dependency scanner

Check whether your project pulls in CVE-2023-25746 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.

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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-2023-25746 in production — separate from our analysis above.

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.

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