CVE-2025-35434: thorium Cert Validation Flaw — Fix

Description

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.

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CVSS v3.1 Score

4.2

MEDIUM

CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

Weakness Type (CWE)

CWE-295 CWE-295

Affected Products

Vendor	Product	Versions
cisa	thorium	< 1.1.2

References

Advisories & Patches

https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2025/va-25-259-01.json

Other References

https://github.com/cisagov/thorium/blob/main/api/src/models/backends/setup/elastic_setup.rs#L36-L43 https://github.com/cisagov/thorium/releases/tag/1.1.2 https://www.cve.org/CVERecord?id=CVE-2025-35434

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 4.2 (MEDIUM).

How severe is CVE-2025-35434? +

CVE-2025-35434 has a CVSS v3.1 score of 4.2 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-35434? +

CVE-2025-35434 affects products from cisa, specifically: thorium. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-35434? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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