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FirefoxWeb browser · Mozilla

CVE-2023-25735

HIGH · 8.8 CVSS v3.1 Published 2023-06-02
Fix available
A fix is available. Upgrade to 102.8 / 110.0 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
Cross-compartment wrappers wrapping a scripted proxy could have caused objects from other compartments to be stored in the main compartment resulting in a use-after-free after unwrapping the proxy. This vulnerability affects Firefox < 110, 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

This is a memory safety vulnerability in Firefox's SpiderMonkey JavaScript engine where cross-compartment wrappers wrapping a scripted proxy incorrectly allow objects from other security compartments to be stored in the main compartment, leading to a use-after-free condition after proxy unwrapping.

MitigationUpdate affected Mozilla products to Firefox 110+, Thunderbird 102.8+, or Firefox ESR 102.8+ to patch the cross-compartment wrapper logic flaw.

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:< 110.0
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. Identify installed Mozilla product
    Check which Mozilla application is installed: Firefox, Firefox ESR, or Thunderbird. In Windows, open Add/Remove Programs or check the application name in its Help > About menu. On macOS, check /Applications folder or the app name in the app menu. On Linux, check installed packages via package manager or look for the application binary.
    Affected if Any of Firefox, Firefox ESR, or Thunderbird is installed
  2. Determine Firefox version
    Open Firefox and navigate to Help > About Firefox. The version number displayed is your installed version.
    Affected if Version is below 110.0 (for example 109.0, 108.0, etc.)
  3. Determine Firefox ESR version
    Open Firefox ESR and navigate to Help > About Firefox ESR. The version number displayed is your installed version.
    Affected if Version is below 102.8 (for example 102.7, 102.6, etc.)
  4. Determine Thunderbird version
    Open Thunderbird and navigate to Help > About Thunderbird. The version number displayed is your installed version.
    Affected if Version is below 102.8 (for example 102.7, 102.6, etc.)

You are affected if you have Firefox below version 110.0, or Firefox ESR/Thunderbird below version 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 / 110.0 or later
Fixed in 102.8110.0
Interim mitigation

Update affected Mozilla products to Firefox 110+, Thunderbird 102.8+, or Firefox ESR 102.8+ to patch the cross-compartment wrapper logic flaw.

Recommended fix High confidence

Firefox 110.0 / Firefox ESR 102.8 / Thunderbird 102.8 (depending on product)

  1. 1. Identify which Mozilla product is affected (Firefox, Firefox ESR, or Thunderbird) and the current installed version
  2. 2. For Firefox: Download and install Firefox 110.0 or later from the official Mozilla website
  3. 3. For Firefox ESR: Download and install Firefox ESR 102.8 or later from the official Mozilla website
  4. 4. For Thunderbird: Download and install Thunderbird 102.8 or later from the official Mozilla website
  5. 5. Restart the application after upgrade
  6. 6. Verify the installed version matches or exceeds the fixed release
Caveat Mozilla releases typically have minimal breaking changes; however, some older extensions or add-ons may need updates for compatibility with 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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dbcve dependency scanner

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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-2023-25735 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