# CVE-2025-66620

## Summary

- **CVE ID:** CVE-2025-66620
- **Severity:** HIGH
- **CVSS Score:** 8.6 (CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-553
- **Published:** Jan 7, 2026
- **Last Modified:** Mar 13, 2026

## 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 (0)

## References

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

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.45%
- **EPSS Percentile:** 38.1

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._