CVE-2026-15270 in DIR-823G
Summary
by MITRE • 07/09/2026
A weakness has been identified in D-link DIR-823G 1.0.2B05_20181207. Affected by this vulnerability is an unknown functionality of the file /etc/boa/boa.conf of the component Web Interface. Executing a manipulation can lead to least privilege violation. The attack can be launched remotely. The attack requires a high level of complexity. The exploitation appears to be difficult. The exploit has been made available to the public and could be used for attacks.
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Analysis
by VulDB Data Team • 07/09/2026
The vulnerability in D-link DIR-823G router model 1.0.2B05_20181207 represents a critical security flaw within the web interface component that affects the configuration file located at /etc/boa/boa.conf. This weakness falls under the category of privilege escalation vulnerabilities where an attacker can manipulate the web server configuration to gain unauthorized access to system resources. The affected component is part of the Boa web server implementation which serves as the primary interface for administrative functions within the router's embedded operating system environment.
The technical flaw stems from improper input validation and access control mechanisms within the web interface functionality that processes requests related to the boa.conf file. This configuration file contains critical parameters that govern how the embedded web server operates, including authentication settings, access permissions, and resource restrictions. When an attacker can manipulate this file through remote exploitation, they can effectively bypass the normal privilege boundaries that should restrict access to administrative functions. The vulnerability specifically targets the least privilege principle as defined by CWE-250, which requires that applications should operate with the minimum set of privileges necessary to perform their intended functions.
The operational impact of this vulnerability extends beyond simple unauthorized access to encompass potential complete system compromise and persistent backdoor establishment. Remote exploitation allows attackers to modify the web server configuration without requiring local physical access or legitimate administrative credentials. This creates a significant risk for network administrators who may not be aware that an attacker has gained elevated privileges within their network infrastructure. The complexity required for exploitation, while high, is not insurmountable given the availability of public exploits and the prevalence of similar vulnerabilities in embedded networking equipment.
Attackers leveraging this vulnerability can potentially establish persistent access to the device through modifications to the boa.conf file, which may include setting up custom authentication mechanisms or disabling security features. The attack surface is particularly concerning as it targets the core web interface functionality that network administrators rely upon for managing router configurations, making it difficult to detect unauthorized modifications. This vulnerability aligns with ATT&CK techniques related to privilege escalation and persistence within network infrastructure devices, specifically targeting the credential access and defense evasion categories.
Security mitigations for this vulnerability should include immediate firmware updates from D-link to address the identified configuration flaw, network segmentation to limit exposure of affected devices, and implementation of intrusion detection systems that monitor for unauthorized changes to web server configuration files. Additionally, administrators should disable unnecessary web interface functionality, implement strong authentication mechanisms, and regularly audit system configurations to detect potential tampering. The availability of public exploits increases the urgency for immediate remediation as threat actors can readily leverage this vulnerability without requiring advanced technical skills or significant resources to develop custom attack vectors.