What is CVE-2025-61939?

CVE-2025-61939 is a high-severity vulnerability in Columbia Weather Systems Microserver, classified under CWE-923. CVSS score: 8.8/10. Published 2026-01-07.

How severe is CVE-2025-61939?

High severity. CVSS v3 base score is 8.8 out of 10.

Vulnerability in Columbia Weather Systems Microserver

CVE-2025-61939

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 resp…

EPSS: 0.000 (10.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Columbia Weather Systems Microserver — versions 0

Weakness classification (CWE)

CWE-923

References

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

Frequently asked questions

What is CVE-2025-61939?: CVE-2025-61939 is a high-severity vulnerability in Columbia Weather Systems Microserver, classified under CWE-923. CVSS score: 8.8/10. Published 2026-01-07.
How severe is CVE-2025-61939?: High severity. CVSS v3 base score is 8.8 out of 10.