BaseFortify

Publication date: 2026-01-07

Last updated on: 2026-01-22

Assigner: ICS-CERT

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.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-01-07

Last Modified

2026-01-22

Generated

2026-07-06

AI Q&A

2026-01-07

EPSS Evaluated

2026-07-05

NVD

CVE-2025-66620

EUVD

EUVD-2026-1166

Affected Vendors & Products

Vendor	Product	Version / Range
columbiaweather	weather_microserver_firmware	to MS_4.1_14142 (exc)
columbiaweather	weather_microserver	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-553	A possible shell file exists in /cgi-bin/ or other accessible directories. This is extremely dangerous and can be used by an attacker to execute commands on the web server.

Attack-Flow Graph

Executive Summary

This vulnerability involves an unused webshell in MicroServer that allows unlimited login attempts. An attacker with admin access can gain limited shell access with sudo rights on certain files and directories. This access enables the attacker to maintain persistence through reverse shells and to modify or remove data stored in the file system.

Impact Analysis

The vulnerability can impact you by allowing an attacker with admin access to gain shell access with elevated privileges, potentially leading to unauthorized modification or deletion of data, and persistent access to the system through reverse shells. This can compromise system integrity, availability, and confidentiality.

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