CVE-2025-40836 in Indoor Connect 8855
Summary
by MITRE • 09/25/2025
Ericsson Indoor Connect 8855 contains an improper input validation vulnerability which if exploited can lead to loss of integrity and confidentiality, as well as unauthorized disclosure and modification of
of user and configuration data. It may also be possible to execute commands with escalated privileges, impact service availability, as well as modify system files and configuration data.
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Analysis
by VulDB Data Team • 09/25/2025
The CVE-2025-40836 vulnerability affects Ericsson Indoor Connect 8855, a network infrastructure device that serves as a critical component in wireless communication systems. This device operates as a base station or access point within indoor environments, managing wireless connections and data transmission for mobile networks. The vulnerability resides within the device's input validation mechanisms, which are essential for processing user inputs, configuration parameters, and system commands. Given the device's role in network infrastructure, any weakness in input validation can create significant security implications for the entire network ecosystem.
The technical flaw represents an improper input validation vulnerability that allows attackers to submit maliciously crafted inputs to the device's processing functions. This weakness enables unauthorized users to manipulate system behavior through carefully constructed data that bypasses normal validation checks. The vulnerability's classification aligns with CWE-20, which describes improper input validation as a fundamental weakness in software design that permits malicious inputs to influence system operations. Attackers can exploit this flaw to inject malformed data that can trigger unintended system behavior, potentially leading to privilege escalation and unauthorized access to sensitive system resources.
The operational impact of this vulnerability extends beyond simple data corruption or loss of confidentiality. The weakness enables attackers to achieve multiple security objectives simultaneously, including unauthorized disclosure and modification of user data and configuration parameters. This dual capability represents a significant threat to system integrity, as adversaries can both read sensitive information and alter system configurations to maintain persistent access or disrupt network services. The potential for command execution with escalated privileges creates a severe threat vector that could allow attackers to take complete control of the device, potentially compromising the entire wireless network segment it serves.
The vulnerability's exploitation can result in service availability impacts through various attack vectors including denial-of-service conditions or system compromise that prevents legitimate operations. System file modification capabilities further amplify the threat, as attackers can alter critical configuration files or system binaries that control device behavior and network operations. This threat model aligns with ATT&CK technique T1059, which covers command and scripting interpreter usage, and T1070, which addresses indicator removal on host. The device's role in wireless network infrastructure makes it particularly attractive to attackers seeking to establish persistent access points or to disrupt critical communications services.
Organizations should implement immediate mitigations including network segmentation to isolate affected devices, deployment of intrusion detection systems to monitor for exploitation attempts, and regular firmware updates from Ericsson to address the vulnerability. The security community should also consider this vulnerability in the context of broader network infrastructure security practices, particularly in environments where wireless access points serve critical communications functions. Regular security assessments of network infrastructure devices are essential to identify similar validation weaknesses that could lead to similar impacts across different vendors and device types.