dbcve.org
FirefoxWeb browser · Mozilla

CVE-2017-7757

CRITICAL · 9.8 CVSS v3.0 Published 2018-06-11
Fix available
A fix is available. Upgrade to 52.2.0 / 54.0 or later.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable No privileges Zero-click

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
A use-after-free vulnerability in IndexedDB when one of its objects is destroyed in memory while a method on it is still being executed. This results in a potentially exploitable crash. This vulnerability affects Firefox < 54, Firefox ESR < 52.2, and Thunderbird < 52.2.

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

A use-after-free vulnerability in IndexedDB where an object is destroyed in memory while a method on that object is still being executed, leading to a potentially exploitable crash.

MitigationUpdate affected software to Firefox 54, Firefox ESR 52.2, or Thunderbird 52.2 or later to resolve the vulnerability.

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:< 52.2.0< 54.0
Debian LinuxOperating system
Affected:= 8.0= 9.0
ThunderbirdApplication
Affected:< 52.2.0

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

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/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 if Firefox or Thunderbird is installed by looking for the application in standard installation directories or checking system package manager listings
    Affected if Either Firefox or Thunderbird is installed
  2. Determine Firefox version
    For Firefox: Open about:support or go to Help > About Firefox to view the exact version number
    Affected if Firefox version is less than 52.2.0 OR less than 54.0 (note: versions 52.2.0-53.999 are also vulnerable if below 54.0)
  3. Determine Thunderbird version
    For Thunderbird: Open Help > About Thunderbird to view the exact version number
    Affected if Thunderbird version is less than 52.2.0
  4. Check if using Debian-packaged Firefox/Thunderbird
    On Debian systems, check installed package version with: dpkg -l firefox-esr or dpkg -l thunderbird
    Affected if Running Debian 8.0 or 9.0 with Firefox/Thunderbird packages from the distribution

A user is affected if they are running Firefox with version less than 54.0 (or less than 52.2.0 for ESR), or Thunderbird with version less than 52.2.0, where the IndexedDB feature is accessible through normal browser usage.

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 52.2.0 / 54.0 or later
Fixed in 52.2.054.0
Interim mitigation

Update affected software to Firefox 54, Firefox ESR 52.2, or Thunderbird 52.2 or later to resolve the vulnerability.

Recommended fix High confidence

Firefox 54.0 (regular) or Firefox ESR 52.2.0; Thunderbird 52.2.0

  1. 1. Determine which Mozilla product is affected (Firefox regular, Firefox ESR, or Thunderbird) and note the current installed version
  2. 2. For Firefox regular: Download Firefox 54.0 or later from the official Mozilla website (www.mozilla.org)
  3. 3. For Firefox ESR: Download Firefox ESR 52.2.0 or later from the official Mozilla website
  4. 4. For Thunderbird: Download Thunderbird 52.2.0 or later from the official Mozilla website
  5. 5. Close all instances of the affected application
  6. 6. Install the updated version using the appropriate installer for your operating system
  7. 7. Restart the application and verify the new version is installed
  8. 8. For Debian Linux systems: Run 'apt-get update' followed by 'apt-get upgrade' or 'apt-get install firefox thunderbird' to receive security updates
Caveat Minimal risk - this is a routine security update; ensure compatibility with any required browser plugins or extensions before upgrading

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

Free · runs locally
dbcve dependency scanner

Check whether your project pulls in CVE-2017-7757 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.

Get it on GitHub Scan in the browser

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-2017-7757 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