Skip to content
Fencer Vulns
medium 6.3

CVE-2025-23390 json

Fleet doesn’t validate a server’s certificate when connecting through SSH

published 2025-04-25 18 mo ago modified 2026-10-19 20 d ago also GHSA-xgpc-q899-67p8 , GO-2025-3649 , EUVD-2025-211104

cvss
6.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 8%
public exploits
0
none known

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.

Patch / fix

  • go github.com/rancher/fleet 0.10.12, 0.11.7, 0.12.2
  • SUSE fleet 0.10.12, 0.11.7, 0.12.2
  • govulncheck-vulndb openSUSE Tumbleweed 0.0.20250506T153719-1.1

opensuse advisories openSUSE-SU-2025:15059-1

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
25 d ago

Exploit prediction

0.19% chance of exploitation in the next 30 days, higher than 8% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 6.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
GitHub 3.1 6.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

Affected packages

ecosystem package affected fixed in
go github.com/rancher/fleet
>=0.9.0-rc.1, <0.10.12
>=0.11.0, <0.11.7
>=0.12.0, <0.12.2
0.10.12
0.11.7
0.12.2

Affected products

  • SUSE fleet

Classification

Weakness
  • CWE-295 Improper Certificate Validation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.