Medium severity · published Jan 7, 2026
CVE-2025-64305
Columbia Weather Systems MicroServer Cleartext Storage in a File or on Disk
6.5
CVSS
0.1%
EPSS
No
On KEV
Description
MicroServer copies parts of the system firmware to an unencrypted external SD card on boot, which contains user and vendor secrets. An attacker can utilize these plaintext secrets to modify the vendor firmware, or gain admin access to the web portal.
CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack vector
Adjacent
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 3% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MI
MicroServer · Columbia Weather Systems
before MS_4.1_14142 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-64305
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-64305
github.com
https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-006-01.json
www.cisa.gov
https://www.cisa.gov/news-events/ics-advisories/icsa-26-006-01
More from MicroServer
7.2
CVE-2025-66620
Columbia Weather Systems MicroServer Command Shell in Externally Accessible Directory
4.4
CVE-2025-61939
Columbia Weather Systems MicroServer Improper Restriction of Communication Channel to Intended Endpoints