Vulnerability in Columbiaweather Weather 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 responses, can redirect the SSH connection to an attacker controlled device.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.003 (18.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 18th percentile — 18.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: -0.000
Affected products
Weakness classification (CWE)
References
- www.cisa.gov/news-events/ics-advisories/icsa-26-006-01 (US Government Resource, Third Party Advisory)
- github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-006-01.js… (Third Party Advisory)
Frequently asked questions
- What is CVE-2025-61939?
- CVE-2025-61939 is a high-severity vulnerability in Columbiaweather Weather 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.