What is CVE-2025-23390?

CVE-2025-23390 is a medium-severity vulnerability in SUSE Fleet, classified under Improper Certificate Validation. CVSS score: 6.3/10. Published 2026-10-15.

How severe is CVE-2025-23390?

Medium severity. CVSS v3 base score is 6.3 out of 10.

Vulnerability in SUSE Fleet

CVE-2025-23390

A vulnerability has been identified within Fleet where, by default, Fleet will automatically trust a remote server’s certificate when connecting through SSH if the certificate isn’t set in the `known_hosts` file. This could allow the execution of a man-in-the-middle (MitM) attack against Fleet. In case the server that is being connected to has a trusted entry in the known_hosts file, then Fleet will correctly check the authenticity of the presented certificate.

Vulnerability class: Improper Certificate Validation

Published 2026-10-15 · last modified 2026-10-15.

CVSS v3 metric

CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

SUSE Fleet

Weakness classification (CWE)

CWE-295 — Improper Certificate Validation

References

Frequently asked questions

What is CVE-2025-23390?: CVE-2025-23390 is a medium-severity vulnerability in SUSE Fleet, classified under Improper Certificate Validation. CVSS score: 6.3/10. Published 2026-10-15.
How severe is CVE-2025-23390?: Medium severity. CVSS v3 base score is 6.3 out of 10.