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An unused function in MicroServer can start a reverse SSH connection to a vendor registered domain, without mutual authentication. An attacker on the local network with admin access to the web server, and the ability to manipulate DNS responses, can redirect the SSH connection to an attacker controlled device.

CVE-2025-61939 is a vulnerability classified under CWE-923, indicating improper restriction of communication channels to intended endpoints. The issue resides in an unused function within the Columbia Weather Systems MicroServer product that can initiate a reverse SSH connection to a domain registered by the vendor. This connection does not enforce mutual authentication, creating a trust boundary weakness. An attacker who has administrative access to the local web server and can manipulate DNS responses on the local network can redirect this SSH connection to an attacker-controlled server. This redirection enables the attacker to intercept or manipulate the SSH session, potentially leading to unauthorized data access, command execution, or further network compromise. The vulnerability is remotely exploitable within the local network without user interaction and does not require authentication for the SSH connection itself, although local admin privileges on the web server are necessary. The CVSS 4.0 score of 8.7 reflects the high impact on confidentiality, integrity, and availability due to the potential for high-value data exfiltration and control over the device. No patches or known exploits are currently available, highlighting the need for proactive mitigation. The vulnerability affects version 0 of the MicroServer product, which may indicate early or initial releases. Given the critical role of weather systems in infrastructure and safety, exploitation could have broader operational impacts.

Detailed information about CVE-2025-61939: CWE-923 Improper Restriction of Communication Channel to Intended Endpoints in Columbia Weather Systems MicroServer a

CVE-2025-61939: CWE-923 Improper Restriction of Communication Channel to Intended Endpoints in Columbia Weather Systems MicroServer - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2025-61939: CWE-923 Improper Restriction of Communication Channel to Intended Endpoints in Columbia Weather Systems MicroServer

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