Improper cert validation in Logstash TCP output (MitM)
CVE-2025-37730 Published on May 6, 2025
Logstash Improper Certificate Validation in TCP output
Improper certificate validation in Logstash's TCP output could lead to a man-in-the-middle (MitM) attack in client mode, as hostname verification in TCP output was not being performed when the ssl_verification_mode => full was set.
Vulnerability Analysis
CVE-2025-37730 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality, with no impact on integrity, and no impact on availability.
Weakness Type
Improper Certificate Validation
The software does not validate, or incorrectly validates, a certificate. When a certificate is invalid or malicious, it might allow an attacker to spoof a trusted entity by interfering in the communication path between the host and client. The software might connect to a malicious host while believing it is a trusted host, or the software might be deceived into accepting spoofed data that appears to originate from a trusted host.
Products Associated with CVE-2025-37730
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Affected Versions
Elastic Logstash:- Version 8.0.0 and below 8.17.6 is affected.
- Version 8.18.0 and below 8.18.1 is affected.
- Version 9.0.0 and below 9.0.1 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.