dbcve.org
LogstashApplication · Elastic

CVE-2018-3817

MEDIUM · 6.5 CVSS v3.0 Published 2018-03-30
Fix available
A fix is available. Upgrade to 5.6.6 / 6.1.2 or later.
See remediation →
71/100
Remediation priority · Elevated
Remotely reachable 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
When logging warnings regarding deprecated settings, Logstash before 5.6.6 and 6.x before 6.1.2 could inadvertently log sensitive information.

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

Logstash versions before 5.6.6 and 6.x before 6.1.2 inadvertently logged sensitive information when generating warning messages about deprecated settings. This resulted in potential exposure of credentials, API keys, or other secrets in plaintext log files.

MitigationUpgrade Logstash to version 5.6.6 or 6.1.2 or later to patch the vulnerability. Additionally, audit existing log files for any accidentally logged sensitive information and rotate compromised credentials.

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
LogstashApplication
Affected:< 5.6.6>= 6.0.0, < 6.1.2

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

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/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 checks

Work through these to decide whether this CVE applies to you.

  1. Determine Logstash version
    Run 'bin/logstash --version' or check the version file in the Logstash installation directory
    Affected if Version is less than 5.6.6, or between 6.0.0 and 6.1.1 inclusive
  2. Identify deprecated settings in Logstash configuration
    Review Logstash pipeline configuration files (usually in /etc/logstash/conf.d/ or custom paths) for settings known to be deprecated in the installed version
    Affected if Any deprecated settings are present and configured
  3. Search log files for plaintext secrets
    Search Logstash logs (typically in /var/log/logstash/ or /path/to/logs/) for patterns matching credentials, API keys, passwords, or tokens in warning messages about deprecated settings
    Affected if Log files contain plaintext sensitive information in deprecation warning messages

User is affected if running a vulnerable Logstash version AND using deprecated settings that trigger warning messages containing sensitive information.

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
Upgrade available Upgrade to 5.6.6 / 6.1.2 or later
Fixed in 5.6.66.1.2
Interim mitigation

Upgrade Logstash to version 5.6.6 or 6.1.2 or later to patch the vulnerability. Additionally, audit existing log files for any accidentally logged sensitive information and rotate compromised credentials.

Fix this in Logstash Scoped from the published advisory
  • Consultation2.0 h
  • Implementation2.0 h
  • Testing2.0 h
  • Review / QA1.0 h
7.0 hours of engineering $1,240
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,984.

Scan for this in your stack

Free · runs locally
dbcve dependency scanner

Check whether your project pulls in CVE-2018-3817 — 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-2018-3817 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