dbcve.org
Enterprise Linux DesktopOperating system · Redhat

CVE-2018-12360

HIGH · 8.8 CVSS v3.0 Published 2018-10-18
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
95/100
Remediation priority · Urgent
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
A use-after-free vulnerability can occur when deleting an input element during a mutation event handler triggered by focusing that element. This results in a potentially exploitable crash. This vulnerability affects Thunderbird < 60, Thunderbird < 52.9, Firefox ESR < 60.1, Firefox ESR < 52.9, and Firefox < 61.

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 Firefox and Thunderbird occurs when an input element is deleted during a mutation event handler that is triggered by focusing that element. The browser attempts to access memory that has already been freed, causing a potentially exploitable crash.

MitigationUpgrade affected installations to Firefox 61 or later, Firefox ESR 60.1/52.9 or later, or Thunderbird 60/52.9 or later to patch 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
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:= 7.5= 7.6
Enterprise Linux Server TusOperating system
Affected:= 7.6
Enterprise Linux WorkstationOperating system
Affected:= 6.0= 7.0
Debian LinuxOperating system
Affected:= 8.0= 9.0
Ubuntu LinuxOperating system
Affected:= 14.04= 16.04= 17.10= 18.04

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
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.0/AV:N/AC:L/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 if Firefox is installed
    Run 'firefox --version' or 'rpm -q firefox' (RHEL) / 'dpkg -l firefox' (Debian/Ubuntu)
    Affected if Firefox is installed and its version is older than 61 (or ESR older than 60.1/52.9)
  2. Check if Thunderbird is installed
    Run 'thunderbird --version' or 'rpm -q thunderbird' (RHEL) / 'dpkg -l thunderbird' (Debian/Ubuntu)
    Affected if Thunderbird is installed and its version is older than 60 (or 52.9)
  3. Determine the exact Firefox version
    Run 'firefox --version' and compare the output to known vulnerable version ranges: Firefox < 61, Firefox ESR 60.x < 60.1, Firefox ESR 52.x < 52.9
    Affected if Version falls within any of the vulnerable version ranges
  4. Determine the exact Thunderbird version
    Run 'thunderbird --version' and compare the output to known vulnerable version ranges: Thunderbird < 60, Thunderbird 52.x < 52.9
    Affected if Version falls within a vulnerable version range
  5. Check OS-supplied browser package version
    On RHEL use 'rpm -qa | grep -i firefox' or 'rpm -qa | grep -i thunderbird'; on Debian/Ubuntu use 'dpkg -l | grep -i firefox' or 'dpkg -l | grep -i thunderbird' to see the installed package version as shipped by the distribution
    Affected if The packaged version corresponds to a vulnerable Firefox/Thunderbird release (typically pre-61 for Firefox, pre-60 for Thunderbird)

A user is affected if Firefox version is below 61 (or ESR below 60.1/52.9) or Thunderbird version is below 60 (or 52.9) is installed on a vulnerable OS distribution listed in the affected products.

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.

From vendor data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Upgrade affected installations to Firefox 61 or later, Firefox ESR 60.1/52.9 or later, or Thunderbird 60/52.9 or later to patch the vulnerability.

Fix this in Enterprise Linux Desktop Scoped from the published advisory
  • Consultation1.0 h
  • Implementation2.0 h
  • Testing1.0 h
  • Review / QA1.0 h
5.0 hours of engineering $890
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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-2018-12360 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