6.3

CVE-2025-23390: suse fleet Improper Certificate Validation

CVSS: 6.3v3.1MediumAwaiting analysis
AliasesGHSA-xgpc-q899-67p8GO-2025-3649
Published 15-10-2026Last modified 15-10-2026
Open JSON

Vulnerability summary

CVE-2025-23390 is a medium (CVSS 6.3) Improper Certificate Validation vulnerability in suse fleet. EPSS estimates a 0.19% chance of exploitation in the next 30 days, higher than 8.1% of scored vulnerabilities.

Overall risk
25/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.3/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.19%
0%100%
Low · Change unavailable
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1 · Related 1
OPENSUSE-SU-2025:15059-1

Timeline

  1. 15-10-2026
    PublishedVulnerability first disclosed.
  2. 15-10-2026
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.19%

Chance of exploitation in the next 30 days

Percentile

8%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

15-10-202618-10-2026
EPSS score
0.19%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Github.com/rancher1 product
  • fleet≥ 0.9.0-rc.1, < 0.10.12 | ≥ 0.11.0, < 0.11.7 | ≥ 0.12.0, < 0.12.2
Suse1 product
  • fleet≥ 0.9.0-rc.1, < 0.10.12 | ≥ 0.11.0, < 0.11.7 | ≥ 0.12.0, < 0.12.2

2 vendors · 2 products

References

10 links