CVE Catalog

CVE-2025-23390

MediumCVSS 6.3
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.19%

8th percentile - higher than 8% of all known CVEs

Summary

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.

Risk Assessment

A man-in-the-middle attacker may impersonate a remote SSH server and intercept or modify data transmitted by Fleet.

Recommendation

Configure Fleet to always verify SSH server certificates, and ensure known_hosts entries are properly set.

Other vulnerabilities in Fleet

See all
Original NVD description (English source)

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 data from NVD (NIST) · CISA KEV · EPSS