Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Columbiaweather | Weather Microserver Firmware | < MS_4.1_14142 |
| Columbiaweather | Weather Microserver | - |
Related Weaknesses (CWE)
References
- https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-00Third Party Advisory
- https://www.cisa.gov/news-events/ics-advisories/icsa-26-006-01Third Party AdvisoryUS Government Resource
FAQ
What is CVE-2025-61939?
CVE-2025-61939 is a vulnerability with a CVSS score of 8.8 (HIGH). 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,...
How severe is CVE-2025-61939?
CVE-2025-61939 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-61939?
Check the references section above for vendor advisories and patch information. Affected products include: Columbiaweather Weather Microserver Firmware, Columbiaweather Weather Microserver.