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CVE-2025-61939

Columbiaweather Weather Microserver Firmware vulnerability

8.8 HIGHEPSS 0.27%
  1. Published7 Jan 2026

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 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

Columbiaweather Weather Microserver Firmware< MS_4.1_14142

Remediation

Fixed in
Columbiaweather Weather Microserver Firmware≥ MS_4.1_14142

References

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Frequently asked

Is CVE-2025-61939 being actively exploited?

CVE-2025-61939 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.27%.

How severe is CVE-2025-61939?

CVE-2025-61939 has a CVSS 3.1 base score of 8.8, rated high. EPSS estimates a 0.27% probability of exploitation.

Which products are affected by CVE-2025-61939?

Affected products include Columbiaweather Weather Microserver Firmware.

How do I fix CVE-2025-61939?

Upgrade affected software to a fixed version, for example Columbiaweather Weather Microserver Firmware MS_4.1_14142 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-61939 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.