What is CVE-2025-66620?

CVE-2025-66620 is a high-severity vulnerability in Columbiaweather Weather_microserver, classified under CWE-553. CVSS score: 8.0/10. Published 2026-01-07.

How severe is CVE-2025-66620?

High severity. CVSS v3 base score is 8.0 out of 10.

Vulnerability in Columbiaweather Weather_microserver

CVE-2025-66620

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…

EPSS: 0.004 (33.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.0 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Columbiaweather Weather_microserver
Columbiaweather Weather_microserver_firmware
Columbia Weather Systems Microserver — versions 0

Weakness classification (CWE)

CWE-553

References

ics-cert@hq.dhs.gov (US Government Resource, Third Party Advisory)
ics-cert@hq.dhs.gov (Third Party Advisory)

Frequently asked questions

What is CVE-2025-66620?: CVE-2025-66620 is a high-severity vulnerability in Columbiaweather Weather_microserver, classified under CWE-553. CVSS score: 8.0/10. Published 2026-01-07.
How severe is CVE-2025-66620?: High severity. CVSS v3 base score is 8.0 out of 10.