What’s Vulnerable › Vulnerabilities

CVE-2025-66620: Columbia Weather Systems MicroServer Command Shell in Externally Accessible Directory

• Severity: high (CVSS 7.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-01-07 · updated 2026-10-07
• Weakness: CWE-553

Description

An unused webshell in MicroServer allows unlimited login attempts, with sudo rights on certain files and directories. An attacker with admin access to MicroServer can gain limited shell access, enabling persistence through reverse shells, and the ability to modify or remove data stored in the file system.

Affected products

• Columbia Weather Systems MicroServer: before MS_4.1_14142 — fixed in MS_4.1_14142

How to fix

Upgrade to a fixed version: Columbia Weather Systems MicroServer MS_4.1_14142. Check the vendor advisory for mitigations.

References

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

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