CVE-2025-63216 is a critical authentication bypass vulnerability affecting the Itel DAB Gateway (IDGat build c041640a). The root cause is improper validation of JSON Web Tokens (JWTs) across devices running the same firmware. Normally, JWTs are intended to authenticate a user or device session securely and should be device-specific or scoped to prevent reuse across different devices. However, in this case, the gateway's firmware does not enforce device-specific validation, allowing an attacker who obtains a valid JWT token from one device to reuse it on any other device running the same firmware version. This bypasses authentication controls, including passwords and network restrictions, enabling the attacker to gain full administrative privileges on the target device. The vulnerability affects all devices running the vulnerable firmware, regardless of network segmentation or password policies. Although no public exploits have been reported yet, the flaw's nature makes it highly exploitable once a valid token is obtained, which could be through phishing, device compromise, or insider threats. The lack of a CVSS score indicates the vulnerability is newly published, but its impact on confidentiality, integrity, and availability is severe, as attackers can fully control affected devices. This can lead to unauthorized configuration changes, data interception, or disruption of services relying on these gateways. The vulnerability highlights the importance of proper JWT implementation, including token binding to device identifiers and strict validation mechanisms. Without patches or firmware updates, organizations remain exposed to potential attacks leveraging this flaw.

For European organizations, the impact of CVE-2025-63216 is significant, especially for those deploying Itel DAB Gateway devices in critical infrastructure, industrial control systems, or enterprise networks. Full administrative access gained through token reuse can lead to unauthorized configuration changes, data breaches, interception of communications, and potential service disruptions. The vulnerability undermines network segmentation and password policies, increasing the attack surface. Organizations relying on these gateways for secure communications or device management may face operational downtime, reputational damage, and regulatory compliance issues under GDPR if personal data is compromised. The ease of exploitation without needing to bypass passwords or network controls exacerbates the risk. Additionally, attackers could use compromised devices as pivot points for lateral movement within networks. The lack of known exploits in the wild currently provides a window for proactive mitigation, but the potential for rapid weaponization is high. European sectors such as energy, manufacturing, telecommunications, and government agencies using these devices are particularly vulnerable.

1. Immediately inventory all Itel DAB Gateway devices and identify those running the vulnerable firmware (IDGat build c041640a). 2. Contact the vendor for firmware updates or patches that address the JWT validation flaw; prioritize applying these updates as soon as they become available. 3. If patches are unavailable, implement network segmentation to isolate affected devices and restrict access to trusted management hosts only. 4. Employ compensating controls such as multi-factor authentication (MFA) for administrative access where possible, even if the device itself does not support it natively. 5. Monitor network traffic for anomalous JWT token reuse patterns or unauthorized administrative access attempts. 6. Rotate or invalidate existing JWT tokens if the system allows, to prevent reuse of stolen tokens. 7. Educate staff on the risks of token theft and enforce strict credential management policies. 8. Consider deploying endpoint detection and response (EDR) solutions to detect lateral movement or unusual device behavior. 9. Establish incident response plans specific to device compromise scenarios involving authentication bypass. 10. Regularly audit device configurations and access logs to detect early signs of exploitation.