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FirefoxWeb browser · Mozilla

CVE-2025-13016

HIGH · 7.5 CVSS v3.1 Published 2025-11-11
Fix available
A fix is available. Upgrade to 140.5.0 / 145.0 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
Incorrect boundary conditions in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 145, Firefox ESR 140.5, 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

Incorrect boundary conditions in the JavaScript:WebAssembly component could allow memory access outside intended bounds, potentially leading to memory corruption or information disclosure. This type of vulnerability typically involves improper validation of array or buffer indices during WebAssembly execution.

MitigationUpdate affected Mozilla products (Firefox, Firefox ESR, Thunderbird) to version 145 or later (or ESR 140.5+) to apply the patch.

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:< 140.5.0< 145.0

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. Check installed Firefox version
    Open Firefox, go to Menu > Help > About Firefox, or navigate to about:support, or run `firefox --version` from command line
    Affected if Version is below 140.5.0 OR version is below 145.0 (any version below 145.0 is vulnerable since 145.0 contains the fix)

If Firefox version is below 145.0, the environment is affected by this vulnerability in the WebAssembly boundary check flaw.

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 140.5.0 / 145.0 or later
Fixed in 140.5.0145.0
Interim mitigation

Update affected Mozilla products (Firefox, Firefox ESR, Thunderbird) to version 145 or later (or ESR 140.5+) to apply the patch.

Recommended fix High confidence

Firefox 145 (or Firefox ESR 140.5 for ESR/Business users)

  1. Open Firefox and navigate to Help > About Firefox to check your current version
  2. If your version is below 140.5.0 or between 140.x and 145.0, click 'Update to latest version' in the About dialog
  3. Alternatively, download Firefox 145 or Firefox ESR 140.5 directly from https://www.mozilla.org/firefox/
  4. Restart Firefox after the update completes
  5. Verify the update by checking Help > About Firefox shows version 145.0 or ESR 140.5
Caveat Standard Firefox update; minimal risk; verify critical extensions are compatible with version 145

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

Fix this in Firefox Scoped from the published advisory
  • Consultation1.0 h
  • Implementation2.0 h
  • Testing2.0 h
  • Review / QA1.0 h
6.0 hours of engineering $1,040
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,664.

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-2025-13016 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