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FilebeatApplication · Elastic

CVE-2025-68383

MEDIUM · 6.5 CVSS v3.1 Published 2025-12-18
Fix available
A fix is available. Upgrade to 8.19.9 / 9.1.9 or later.
See remediation →
70/100
Remediation priority · Elevated
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
Improper Validation of Specified Index, Position, or Offset in Input (CWE-1285) in Filebeat Syslog parser and the Libbeat Dissect processor can allow a user to trigger a Buffer Overflow (CAPEC-100) and cause a denial of service (panic/crash) of the Filebeat process via either a malformed Syslog message or a malicious tokenizer pattern in the Dissect configuration.

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

Improper validation of specified index, position, or offset in Filebeat's Syslog parser and Libbeat's Dissect processor allows buffer overflow. An attacker can trigger this by sending malformed Syslog messages or configuring malicious tokenizer patterns in Dissect, causing the Filebeat process to panic or crash.

MitigationUpgrade to the patched Filebeat version when available. Until then, restrict processing of Syslog messages to trusted sources and validate Dissect tokenizer patterns before deployment.

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
FilebeatApplication
Affected:>= 7.0.0, <= 7.17.29>= 8.0.0, < 8.19.9>= 9.0.0, < 9.1.9>= 9.2.0, < 9.2.3

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

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/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 installed Filebeat version
    Run 'filebeat version' or inspect the installed package (dpkg -l filebeat, rpm -qi filebeat, etc.)
    Affected if The version falls within >= 7.0.0 <= 7.17.29, >= 8.0.0 < 8.19.9, >= 9.0.0 < 9.1.9, or >= 9.2.0 < 9.2.3
  2. Identify Syslog input configuration
    Search for 'syslog' input type in Filebeat configuration files (typically in /etc/filebeat/ or specified via -c flag)
    Affected if Filebeat is configured to receive and parse Syslog messages from network sources (ports 514/UDP, 514/TCP, or syslog file inputs)
  3. Identify Dissect processor usage
    Search for 'dissect' processor in Filebeat configuration or pipeline definitions
    Affected if A Dissect processor is configured with tokenizer patterns that could be manipulated
  4. Assess Syslog input source trust
    Review network listeners and syslog source IP allowlists or firewall rules controlling which systems can send Syslog to Filebeat
    Affected if Syslog input accepts connections from untrusted or internet-facing network sources

You are affected if Filebeat version is within the vulnerable ranges AND either the Syslog input is in use receiving messages from untrusted sources OR a Dissect processor with configurable tokenizer patterns is deployed.

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 8.19.9 / 9.1.9 / 9.2.3 or later
Fixed in 8.19.99.1.99.2.3
Interim mitigation

Upgrade to the patched Filebeat version when available. Until then, restrict processing of Syslog messages to trusted sources and validate Dissect tokenizer patterns before deployment.

Recommended fix Moderate confidence

Filebeat 8.19.9 (or 9.2.3/9.1.9 depending on your major version branch); 7.x users should migrate to 8.x or 9.x as 7.x is end-of-life

  1. 1. Identify your current Filebeat version using 'filebeat version' command
  2. 2. For Filebeat 7.x users: Upgrade to version 7.17.30 or later, or migrate to 8.x (note: 7.x is end-of-life, consider migrating to 8.x or 9.x)
  3. 3. For Filebeat 8.x users (8.0.0 to 8.19.8): Upgrade to version 8.19.9 or later
  4. 4. For Filebeat 9.0.x users: Upgrade to version 9.1.9 or later
  5. 5. For Filebeat 9.2.x users: Upgrade to version 9.2.3 or later
  6. 6. After upgrade, restart the Filebeat service using 'systemctl restart filebeat' or 'service filebeat restart'
  7. 7. Verify Filebeat is running properly: check service status and review logs for any startup errors
Caveat Potential minor config compatibility changes between major versions; test in staging before production deployment

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Filebeat Scoped from the published advisory
  • Consultation4.0 h
  • Implementation16.0 h
  • Testing12.0 h
  • Review / QA4.0 h
36.0 hours of engineering $6,200
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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-2025-68383 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