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An issue was discovered on FIRSTNUM JC21A-04 devices through 2.01ME/FN. They enable the SSH service by default with the credentials of root/admin. The GUI doesn't offer a way to disable the account.

CVE-2025-43980 is a security vulnerability identified in FIRSTNUM JC21A-04 devices running firmware versions up to 2.01ME/FN. The core issue is that these devices have the SSH service enabled by default with hardcoded credentials (root/admin). Furthermore, the device's graphical user interface (GUI) does not provide an option to disable or modify this default account, effectively locking administrators into using these insecure credentials. This creates a significant security risk because SSH access with default, well-known credentials can be easily exploited by attackers to gain unauthorized root-level access to the device. Since the root account typically has full control over the device, an attacker could manipulate device configurations, intercept or redirect network traffic, or use the device as a pivot point for further attacks within a network. The lack of a patch or mitigation option in the GUI exacerbates the risk, as users cannot remediate the vulnerability through standard configuration changes. Although there are no known exploits in the wild at the time of publication, the vulnerability's nature and ease of exploitation make it a critical concern for organizations using these devices. The absence of a CVSS score suggests that the vulnerability has not yet been fully assessed, but the technical details indicate a high-risk scenario due to default credentials and root-level access via SSH.

Detailed information about CVE-2025-43980: n/a. Get real-time updates, technical details, and mitigation strategies.

CVE-2025-43980: n/a - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2025-43980: n/a

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