CVE-2025-37730: elastic logstash Improper Certificate Validation
CVSS: 6.5v3.1MediumDeferred
Published 06-05-2025Last modified 06-05-2025
Vulnerability summary
CVE-2025-37730 is a medium (CVSS 6.5) Improper Certificate Validation vulnerability in elastic logstash. EPSS estimates a 0.18% chance of exploitation in the next 30 days, higher than 6.8% of scored vulnerabilities.
CVSS score
6.5/10
010
Medium · v3.1 (CVE.org)EPSS score
0.18%
0%100%
Low · +0.01 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Timeline
- 06-05-2025PublishedVulnerability first disclosed.
- 06-05-2025Last modifiedVulnerability information updated.
Description
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.
CVSS metrics
2 scores · 2 sources · 1 versionMedium 6.5Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:NSourcesAll 2 agree
- NVDNIST6.5MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
EPSS trend
Probability
0.18%
Chance of exploitation in the next 30 days
Percentile
7%
Versus all other CVEs
30-day change
+0.01 pp
From 0.17% on 18-09-2026
18-09-202618-10-2026
EPSS score0.18%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Elastic1 product
- logstash≥ 8.0.0, < 8.17.6 | ≥ 8.18.0, < 8.18.1 | ≥ 9.0.0, < 9.0.1
1 vendor · 1 product