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Description

An unused function in MicroServer can start a reverse SSH connection to a vendor registered domain, without mutual authentication. An attacker on the local network with admin access to the web server, and the ability to manipulate DNS responses, can redirect the SSH connection to an attacker controlled device.

PUBLISHED Reserved 2025-12-08 | Published 2026-01-07 | Updated 2026-01-07 | Assigner icscert




HIGH: 8.7CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

HIGH: 8.8CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Problem types

CWE-923 Improper Restriction of Communication Channel to Intended Endpoints

Product status

Default status
unaffected

Any version before MS_4.1_14142
affected

Credits

UsrPacific/Columbia Weather Systems reported these vulnerabilities to CISA. finder

References

www.cisa.gov/news-events/ics-advisories/icsa-26-006-01

github.com/...p/csaf_files/OT/white/2026/icsa-26-006-01.json

cve.org (CVE-2025-61939)

nvd.nist.gov (CVE-2025-61939)

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