FirefoxWeb browser · Mozilla
CVE-2024-7525
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 · uneditedIt was possible for a web extension with minimal permissions to create a `StreamFilter` which could be used to read and modify the response body of requests on any site. This vulnerability affects Firefox < 129, Firefox ESR < 115.14, Firefox ESR < 128.1, Thunderbird < 128.1, and Thunderbird < 115.14.
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 confidenceA web extension with minimal permissions could create a StreamFilter to read and modify HTTP response bodies on any website, bypassing intended permission boundaries in the webRequest API.
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
< 129.0
Firefox EsrWeb browser
< 115.14.0= 128.0< 115.14.0= 128.0.1CVSS 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
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
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 checksWork through these to decide whether this CVE applies to you.
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Identify installed Mozilla productOpen the application and navigate to Help > About (Firefox or Thunderbird). The product name and exact version number will be displayed.Affected if Product is Firefox or Thunderbird
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Check Firefox version against affected rangeIf the product is Firefox, compare the installed version to 129.0. Versions below 129.0 are affected.Affected if Firefox version is less than 129.0
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Check Firefox ESR version against affected rangeIf the product is Firefox ESR, compare the installed version to 115.14.0 and 128.0. Versions below 115.14.0 or exactly 128.0 are affected.Affected if Firefox ESR version is less than 115.14.0 or equals 128.0
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Check Thunderbird version against affected rangeIf the product is Thunderbird, compare the installed version to 115.14.0 and 128.0.1. Versions below 115.14.0 or exactly 128.0.1 are affected.Affected if Thunderbird version is less than 115.14.0 or equals 128.0.1
The environment is affected if Firefox is below 129.0, Firefox ESR is below 115.14.0 or exactly 128.0, or Thunderbird is below 115.14.0 or exactly 128.0.1.
Generated from the published advisory. Verify against your own configuration.
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 · scoped115.14.0129.0
Update to Firefox 129, Firefox ESR 115.14/128.1, or Thunderbird 115.14/128.1 to restrict StreamFilter creation to extensions with proper authorization.
Firefox 129.0+ | Firefox ESR 115.14.0+ or 128.1+ | Thunderbird 115.14.0+ or 128.1+
- Open Firefox/Thunderbird and navigate to the Help menu
- Select 'About Firefox' or 'About Thunderbird'
- The application will automatically check for and download the latest version
- Restart the application after the update completes
- Alternatively, download the specific fixed version directly from the official Mozilla website: https://www.mozilla.org/ for Firefox or https://www.thunderbird.net/ for Thunderbird
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
- Testing2.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,376.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2024-7525 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2024-7525 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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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.
- 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