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FirefoxWeb browser · Mozilla

CVE-2025-13012

HIGH · 7.5 CVSS v3.1 Published 2025-11-11
Fix available
A fix is available. Upgrade to 115.30.0 / 140.5.0 or later.
See remediation →
82/100
Remediation priority · High
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
Race condition in the Graphics component. This vulnerability was fixed in Firefox 145, Firefox ESR 140.5, Firefox ESR 115.30, Thunderbird 145, and Thunderbird 140.5.

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

A race condition vulnerability exists in the Graphics component of Firefox and Thunderbird. This is a timing-based vulnerability where concurrent operations in the graphics subsystem lead to undefined behavior, potentially allowing an attacker to cause unexpected states. The vulnerability was addressed in Firefox 145, Firefox ESR 115.30 and 140.5, and Thunderbird 145 and 140.5.

MitigationApply the vendor-supplied patches by upgrading to Firefox 145 (or ESR 115.30/140.5) and Thunderbird 145 (or 140.5), or later versions.

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:< 115.30.0< 145.0>= 140.0, < 140.5.0

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
High
Privileges
None
User interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:H/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 Firefox version
    Run 'firefox --version' in terminal, or open Firefox and navigate to Help > About Firefox to view the version number
    Affected if Version is below 115.30.0, or below 145.0, or between 140.0 and 140.4.x inclusive
  2. Identify Thunderbird version
    Run 'thunderbird --version' in terminal, or open Thunderbird and navigate to Help > About Thunderbird to view the version number
    Affected if Version is below 140.5.0 or below 145.0 (specific to your branch)
  3. Check Firefox ESR version if applicable
    Run 'firefox --version' or check Help > About Firefox; look for ESR designation in the version string
    Affected if Version is below 115.30.0 (ESR 115 branch) or below 140.5.0 (ESR 140 branch)
  4. Verify graphics component is in use
    This is a core graphics subsystem vulnerability present whenever Firefox or Thunderbird renders content; no additional feature check needed as the graphics component is always active by default
    Affected if Running any vulnerable version of Firefox or Thunderbird with graphical display enabled

You are affected if you are running any version of Firefox below 115.30.0, below 145.0, or between 140.0-140.4.x; or any version of Thunderbird below 140.5.0 or below 145.0.

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 115.30.0 / 140.5.0 / 145.0 or later
Fixed in 115.30.0140.5.0145.0
Interim mitigation

Apply the vendor-supplied patches by upgrading to Firefox 145 (or ESR 115.30/140.5) and Thunderbird 145 (or 140.5), or later versions.

Recommended fix High confidence

Firefox 145, Firefox ESR 140.5, or Firefox ESR 115.30 (depending on current version branch)

  1. Identify the currently installed Firefox version via Help > About Firefox
  2. If running Firefox < 115.30.0: upgrade to Firefox ESR 115.30
  3. If running Firefox >= 140.0 and < 140.5.0: upgrade to Firefox 140.5.0
  4. If running Firefox 115.30.0 through 139.x: upgrade to Firefox 145
  5. For Thunderbird users: upgrade to Thunderbird 140.5 (for 140.x versions) or Thunderbird 145 (for earlier versions)
  6. Verify the installed version after upgrade via Help > About to confirm the fix is applied
Caveat Minor version upgrades typically do not introduce breaking changes; review release notes for any graphics-related behavior 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
  • 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

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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-2025-13012 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