What is CVE-2025-35434?

CVE-2025-35434 is a medium-severity vulnerability in Cisa Thorium, classified under Improper Certificate Validation. CVSS score: 4.2/10. Published 2025-09-17.

How severe is CVE-2025-35434?

Medium severity. CVSS v3 base score is 4.2 out of 10.

Vulnerability in Cisa Thorium

CVE-2025-35434

CISA Thorium does not validate TLS certificates when connecting to Elasticsearch. An unauthenticated attacker with access to a Thorium cluster could impersonate the Elasticsearch service. Fixed in 1.1.2.

Vulnerability class: Improper Certificate Validation

EPSS: 0.002 (8.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.2 (Medium). Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N.

Affected products

Cisa Thorium — versions 1.0.0, 1.1.2

Weakness classification (CWE)

CWE-295 — Improper Certificate Validation

References

9119a7d8-5eab-497f-8521-727c672e3725 (Release Notes)
9119a7d8-5eab-497f-8521-727c672e3725 (Product)
9119a7d8-5eab-497f-8521-727c672e3725 (Third Party Advisory)
9119a7d8-5eab-497f-8521-727c672e3725 (Vendor Advisory)

Frequently asked questions

What is CVE-2025-35434?: CVE-2025-35434 is a medium-severity vulnerability in Cisa Thorium, classified under Improper Certificate Validation. CVSS score: 4.2/10. Published 2025-09-17.
How severe is CVE-2025-35434?: Medium severity. CVSS v3 base score is 4.2 out of 10.