What is the CVSS score of CVE-2025-66620?

CVE-2025-66620 has a CVSS 3.1 base score of 8.0 (High). CVSS vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

Which versions of Weather Microserver Firmware are affected by CVE-2025-66620?

Organizations using An unused webshell in MicroServer face notable risk from CVE-2025-66620 rated CVSS 8.0.

How to fix or mitigate CVE-2025-66620?

Within 7 days: Identify all affected systems and apply vendor patches promptly. Monitor vendor channels for patch availability.

Weather Microserver Firmware CVE-2025-66620

HIGH

Command Shell in Externally Accessible Directory (CWE-553)

2026-01-07 ics-cert@hq.dhs.gov

Information Disclosure Weather Microserver Firmware

8.0

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

8.0 HIGH

AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Adjacent

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

CVE Published

Jan 07, 2026 - 21:15 nvd

HIGH 8.0

DescriptionCVE.org

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.

AnalysisAI

An unused webshell in MicroServer allows unlimited login attempts, with sudo rights on certain files and directories. [CVSS 8.0 HIGH]

Technical ContextAI

Affects Weather Microserver Firmware. 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.