Improper Certificate Validation Affecting logstash-output-tcp package, versions <6.2.2>=7.0.0, <7.0.1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-RUBY-LOGSTASHOUTPUTTCP-10574452
- published2 Jul 2025
- disclosed6 May 2025
- creditUnknown
Introduced: 6 May 2025
CVE-2025-37730 (opens in a new tab)How to fix?
Upgrade logstash-output-tcp to version 6.2.2, 7.0.1 or higher.
Overview
logstash-output-tcp is an a Logstash plugin required to be installed on top of the Logstash core pipeline using $LS_HOME/bin/logstash-plugin install gemname. This gem is not a stand-alone program.
Affected versions of this package are vulnerable to Improper Certificate Validation due to the lack of hostname verification in the TCP output when ssl_verification_mode is set to full. An attacker in “client” mode can intercept and alter the communication by positioning themselves between the communicating parties.
Note: While the vulnerability exists in the logstash-output-tcp package, it is not a standalone package. logstash-output-tcp is a plugin intended to be installed on top of the Logstash core pipeline.
As such, this issue can be mitigated either by updating the package directly or by updating Logstash to a patched version as indicated here