CVE-2025-66620

Authenticated shell access via exposed web shell

Published Jan 7, 2026 · Updated Jan 7, 2026

Command shell exposure in Columbia Weather Systems MicroServer before MS_4.1_14142 allows remote authenticated users to gain limited shell access. An unused externally accessible web shell accepts unlimited login attempts and grants sudo rights over certain files and directories. Administrative access on the adjacent network is required; exploitation supports reverse-shell persistence and file modification or deletion.

CVSS severity8.6
High
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Command shell exposure in Columbia Weather Systems MicroServer before MS_4.1_14142 allows remote authenticated users to gain limited shell access. An unused externally accessible web shell accepts unlimited login attempts and grants sudo rights over certain files and directories. Administrative access on the adjacent network is required; exploitation supports reverse-shell persistence and file modification or deletion.

The record

CVE
CVE-2025-66620
Published
Jan 7, 2026
Updated
Jan 7, 2026
Vendor
Columbia Weather Systems
Product
Weather MicroServer
Classifications
CWE-553, T1059, T1505.003
Attack vector
adjacent
Privileges
admin

Timeline

How it unfolded

  1. Jan 7, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 7, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <MS_4.1_14142

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesadmin

What is affected?

Columbia Weather Systems · Weather MicroServerversion=0 <MS_4.1_14142

Published CVSS scores

8.6ICS-CERTCVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
8.0ICS-CERTCVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.2NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-553Command Shell in Externally Accessible Directory
T1059Command and Scripting Interpreter
T1505.003Server Software Component: Web Shell

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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