CVE-2025-9727 in DIR-816L
Summary
by MITRE • 08/31/2025
A weakness has been identified in D-Link DIR-816L 206b01. Affected by this issue is the function soapcgi_main of the file /soap.cgi. This manipulation of the argument service causes os command injection. Remote exploitation of the attack is possible. The exploit has been made available to the public and could be exploited. This vulnerability only affects products that are no longer supported by the maintainer.
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Analysis
by VulDB Data Team • 08/31/2025
The vulnerability identified as CVE-2025-9727 represents a critical command injection flaw within the D-Link DIR-816L 206b01 router firmware, specifically targeting the soapcgi_main function in the /soap.cgi file. This weakness stems from inadequate input validation and sanitization of the service argument parameter, creating a pathway for malicious actors to execute arbitrary operating system commands on the affected device. The vulnerability's classification aligns with CWE-77 and CWE-94, which respectively address command injection and code injection flaws that allow attackers to execute arbitrary code with the privileges of the affected application. The issue manifests through the soap.cgi component that handles Simple Object Access Protocol requests, making it particularly dangerous as it operates within the router's web administration interface.
The technical exploitation of this vulnerability enables remote attackers to inject malicious commands through the service parameter, potentially allowing full system compromise of the affected router. This command injection vulnerability arises from improper handling of user-supplied input that flows directly into system execution calls without adequate sanitization or validation. The attack vector is particularly concerning as it allows remote exploitation without requiring authentication, making it accessible to any attacker who can reach the device's web interface. The vulnerability's impact extends beyond simple command execution, as it could enable attackers to gain persistent access to the network, modify router configurations, redirect traffic, or establish backdoor access points. According to the ATT&CK framework, this vulnerability maps to T1059.001 for command and script interpreter and T1021.001 for remote services, representing the attack techniques most relevant to exploiting such command injection flaws in network infrastructure devices.
The operational impact of this vulnerability is severe for organizations and individuals utilizing unsupported D-Link DIR-816L devices, as the lack of vendor support means no official patches or security updates are available to remediate the issue. The public availability of exploit code significantly increases the risk of widespread exploitation, particularly in environments where these legacy devices remain operational. Network administrators should immediately consider removing affected devices from production networks or implementing network segmentation to isolate them from critical systems. The vulnerability's exploitation could lead to complete network compromise, as routers serve as central points of control for network traffic and often contain sensitive configuration data. Organizations should conduct immediate vulnerability assessments to identify all instances of this router model within their infrastructure and prioritize their removal or replacement. The lack of vendor support for this specific firmware version creates a particularly challenging security scenario, as traditional remediation approaches such as applying security patches are not available. This vulnerability exemplifies the risks associated with maintaining legacy network equipment without proper security support, highlighting the importance of regular firmware updates and network asset inventory management.