CVE-2025-61939

Summary

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.

Affected Software

Weaknesses

• CWE-923: CWE-923 Improper Restriction of Communication Channel to Intended Endpoints

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: total

References

• https://www.cisa.gov/news-events/ics-advisories/icsa-26-006-01
• https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-006-01.json

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