dbcve.org
FirefoxWeb browser · Mozilla

CVE-2018-18492

CRITICAL · 9.8 CVSS v3.0 Published 2019-02-28
Fix available
A fix is available. Upgrade to 60.4.0 / 64.0 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 can occur after deleting a selection element due to a weak reference to the select element in the options collection. This results in a potentially exploitable crash. This vulnerability affects Thunderbird < 60.4, Firefox ESR < 60.4, and Firefox < 64.

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 exists in Firefox and Thunderbird where a weak reference to a deleted select element remains in the options collection. When the memory is reallocated, this leads to a potentially exploitable crash.

MitigationUpgrade to Firefox 64 or later, Firefox ESR 60.4 or later, or Thunderbird 60.4 or later to remediate this 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:< 60.4.0< 64.0
Debian LinuxOperating system
Affected:= 8.0= 9.0
Ubuntu LinuxOperating system
Affected:= 14.04= 16.04= 18.04= 18.10
Enterprise Linux DesktopOperating system
Affected:= 6.0= 7.0
Enterprise Linux ServerOperating system
Affected:= 6.0= 7.0
Enterprise Linux Server AusOperating system
Affected:= 7.6
Enterprise Linux Server EusOperating system
Affected:= 7.6
Enterprise Linux Server TusOperating system
Affected:= 7.6

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 on the system. On Windows, look in Program Files; on macOS, look in /Applications; on Linux, check package manager or which firefox thunderbird
    Affected if Neither Firefox nor Thunderbird is installed (not affected)
  2. Determine Firefox version
    Open Firefox, go to Help > About Firefox, or run 'firefox --version' from command line
    Affected if Version is less than 60.4.0 or between 60.4.0 and 64.0 (excluding 64.0)
  3. Determine Thunderbird version
    Open Thunderbird, go to Help > About Thunderbird, or run 'thunderbird --version' from command line
    Affected if Version is less than 60.4.0 or between 60.4.0 and 64.0 (excluding 64.0)
  4. Check OS version on Linux systems
    Run 'cat /etc/os-release' or 'lsb_release -a' to identify the Linux distribution and version
    Affected if Running Debian 8.0 or 9.0, Ubuntu 14.04, 16.04, 18.04, or 18.10, or RHEL 6.0, 7.0, or 7.6 with vulnerable browser versions

A user is affected if Firefox or Thunderbird version is below 60.4.0 or between 60.4.0 and 64.0 (not including 64.0), especially on the listed Linux distributions.

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 60.4.0 / 64.0 or later
Fixed in 60.4.064.0
Interim mitigation

Upgrade to Firefox 64 or later, Firefox ESR 60.4 or later, or Thunderbird 60.4 or later to remediate this vulnerability.

Recommended fix High confidence

Firefox 64.0+, Firefox ESR 60.4+, or Thunderbird 60.4+

  1. Update the system package index: 'sudo apt-get update' (Debian/Ubuntu) or 'sudo yum check-update' (RHEL/CentOS)
  2. Upgrade Firefox to version 64.0 or later: 'sudo apt-get install firefox' (Debian/Ubuntu) or 'sudo yum update firefox' (RHEL/CentOS)
  3. If using Thunderbird, upgrade to version 60.4 or later: 'sudo apt-get install thunderbird' or 'sudo yum update thunderbird'
  4. If using Firefox ESR, upgrade to version 60.4 or later
  5. Restart the browser/application after upgrade
  6. Verify the installed version: 'firefox --version' or 'thunderbird --version'

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
  • Testing1.0 h
  • Review / QA1.0 h
6.0 hours of engineering $1,090
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,744.

Scan for this in your stack

Free · runs locally
dbcve dependency scanner

Check whether your project pulls in CVE-2018-18492 — 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-2018-18492 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