CVE-2025-63210 identifies a critical authentication bypass vulnerability in Newtec Celox UHD satellite communication devices, specifically models CELOXA504 and CELOXA820 running firmware version celox-21.6.13. The vulnerability arises from the ability of an attacker to intercept and modify HTTP responses from the /celoxservice endpoint during the loginWithUserName authentication flow. By injecting a forged response body, the attacker can bypass standard credential checks and obtain Superuser or Operator access without valid login credentials. This effectively grants full administrative control over the device, enabling unauthorized configuration changes, disruption of satellite communication services, or further lateral movement within the network. The vulnerability exploits a fundamental flaw in the authentication mechanism, relying on the manipulation of intercepted network traffic. No CVSS score has been assigned yet, and no public exploits have been reported, but the potential for severe impact is high given the elevated privileges gained. The affected firmware version is celox-21.6.13, and no patches or mitigations have been officially published at the time of disclosure. The attack vector requires network access to intercept and modify traffic, which could be feasible in scenarios where the attacker has access to the same network segment or can perform man-in-the-middle attacks. This vulnerability is particularly concerning for organizations relying on Newtec Celox UHD devices for critical satellite communications, as unauthorized control could lead to significant operational and security consequences.

For European organizations, this vulnerability could lead to unauthorized administrative access to critical satellite communication infrastructure, potentially disrupting communication services vital for defense, emergency response, maritime, and broadcasting sectors. The compromise of Superuser or Operator access could allow attackers to alter device configurations, intercept or manipulate satellite data streams, or disable communication links, impacting confidentiality, integrity, and availability. Given the strategic importance of satellite communications in Europe for both civilian and governmental operations, exploitation could result in operational downtime, data breaches, and loss of trust in communication systems. Additionally, attackers gaining control could use these devices as pivot points for broader network intrusions. The absence of known exploits currently limits immediate risk, but the vulnerability's nature suggests a high potential impact if weaponized. Organizations dependent on these devices must consider the risk of targeted attacks, especially in sectors with high satellite communication reliance.

Immediate mitigation should focus on network-level protections to prevent interception and modification of traffic to the /celoxservice endpoint. This includes deploying strong encryption (e.g., VPNs or TLS) for management interfaces and enforcing strict network segmentation to limit access to device management traffic. Implementing intrusion detection systems to monitor for anomalous traffic patterns or unauthorized access attempts can provide early warning. Organizations should engage with Newtec or authorized vendors to obtain firmware updates or patches addressing this vulnerability as soon as they become available. Until patches are released, consider disabling remote management interfaces or restricting access to trusted IP addresses only. Regularly audit device configurations and access logs to detect suspicious activities. Additionally, educating network administrators about the risk of man-in-the-middle attacks and enforcing strong physical and logical security controls around satellite communication infrastructure is critical.