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Vulnerability record · CVE-2025-61939 · published 7 January 2026

CVE-2025-61939: Columbiaweather weather microserver firmware vulnerability

Columbiaweather · Weather Microserver Firmware

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.

8.7 CVSS 4.0 High EPSS 0.27% · top 82.2% CWE-923 · CWE-923
8.7CVSS 4.0 base score
0.27%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

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:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-006-01.json Third Party Advisory
https://www.cisa.gov/news-events/ics-advisories/icsa-26-006-01 Third Party AdvisoryUS Government Resource

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

8.8CVE-2018-18877Columbiaweather weather microserver firmware improper authentication vulnerabilityIn firmware version MS_2.6.9900 of Columbia Weather MicroServer, an authenticated web user can access an alternative configuration page config_main.p…EPSS 1.7%8.8CVE-2018-18879Columbiaweather weather microserver firmware code injection vulnerabilityIn firmware version MS_2.6.9900 of Columbia Weather MicroServer, an authenticated web user can pipe commands directly to the underlying operating sys…EPSS 2.1%8.6CVE-2025-66620Columbiaweather weather microserver firmware vulnerabilityAn unused webshell in MicroServer allows unlimited login attempts, with sudo rights on certain files and directories. An attacker with admin access t…EPSS 0.45%7.5CVE-2018-18878Columbiaweather weather microserver firmware improper input validation vulnerabilityIn firmware version MS_2.6.9900 of Columbia Weather MicroServer, the BACnet daemon does not properly validate input, which could allow a remote attac…EPSS 2.9%5.4CVE-2018-18875Columbiaweather weather microserver firmware cross-site scripting vulnerabilityIn firmware version MS_2.6.9900 of Columbia Weather MicroServer, a stored Cross-site scripting (XSS) vulnerability allows remote authenticated users …EPSS 0.93%5.4CVE-2018-18880Columbiaweather weather microserver firmware cross-site scripting vulnerabilityIn firmware version MS_2.6.9900 of Columbia Weather MicroServer, a networkdiags.php reflected Cross-site scripting (XSS) vulnerability allows remote …EPSS 0.93%5.3CVE-2018-18876Columbiaweather weather microserver firmware path traversal vulnerabilityIn firmware version MS_2.6.9900 of Columbia Weather MicroServer, a readouts_rd.php directory traversal issue makes it possible to read any file prese…EPSS 2.4%

Source: NIST National Vulnerability Database (record CVE-2025-61939), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.