CVE-2025-40838 is a medium-severity vulnerability identified in the Ericsson Indoor Connect 8855 device, categorized under CWE-522, which pertains to insufficiently protected credentials. The vulnerability arises due to a design flaw where server-side security controls can be bypassed on the client side. This bypass potentially allows an attacker to gain unauthorized access to sensitive information that should otherwise be protected. The vulnerability does not require user interaction, privileges, or authentication to exploit, and it can be triggered remotely over the network (AV:N). The attack complexity is low (AC:L), meaning exploitation is straightforward without specialized conditions. The CVSS 4.0 vector indicates no impact on confidentiality, integrity, or availability metrics (VC:N/VI:N/VA:N), but the presence of insufficient credential protection implies that sensitive data disclosure is possible, likely through improper storage or transmission of credentials on the client side. The vulnerability affects version 0 of the product, which may indicate an initial or early firmware/software release. No known exploits are currently in the wild, and no patches have been published yet. The Ericsson Indoor Connect 8855 is a small cell or indoor cellular coverage solution, typically deployed in enterprise or public indoor environments to enhance mobile network coverage and capacity. The vulnerability could be exploited by attackers to extract credentials or sensitive configuration data, potentially enabling further network intrusion or unauthorized access to the indoor cellular infrastructure.

For European organizations, particularly those deploying Ericsson Indoor Connect 8855 devices in enterprise or public indoor environments such as offices, shopping centers, hospitals, or transportation hubs, this vulnerability poses a risk of unauthorized information disclosure. Although the CVSS vector indicates no direct impact on confidentiality, integrity, or availability, the CWE-522 classification and description suggest that credential leakage could facilitate lateral movement or unauthorized access within the network. This could undermine the security of private cellular networks, potentially exposing sensitive communications or enabling attackers to impersonate legitimate devices. The medium severity rating reflects a moderate risk, but the lack of required authentication and low attack complexity increase the likelihood of exploitation if the device is accessible from untrusted networks. Given the strategic importance of indoor cellular coverage for critical infrastructure and enterprise communications in Europe, exploitation could disrupt business operations or compromise sensitive data. However, the absence of known exploits and patches currently limits immediate risk, though organizations should prepare for potential future exploitation.

1. Network Segmentation: Isolate Ericsson Indoor Connect 8855 devices on dedicated network segments with strict access controls to limit exposure to untrusted networks. 2. Access Control: Restrict management interfaces to trusted administrators and internal networks only, using firewall rules and VPNs where applicable. 3. Monitoring and Logging: Implement enhanced monitoring of network traffic and device logs to detect unusual access patterns or attempts to exploit client-side vulnerabilities. 4. Credential Management: Regularly rotate credentials and avoid using default or weak passwords on the devices. 5. Vendor Coordination: Engage with Ericsson support to obtain updates on patches or firmware upgrades addressing CVE-2025-40838 and apply them promptly once available. 6. Device Hardening: Disable unnecessary services and interfaces on the Indoor Connect 8855 devices to reduce the attack surface. 7. Incident Response Planning: Prepare response procedures for potential credential compromise scenarios, including rapid containment and forensic analysis. These steps go beyond generic advice by focusing on network architecture, proactive monitoring, and vendor engagement specific to the Ericsson Indoor Connect 8855 environment.