CVE-2025-8956 in DIR‑818L
Summary
by MITRE • 08/14/2025
A vulnerability was found in D-Link DIR‑818L up to 1.05B01. This issue affects the function getenv of the file /htdocs/cgibin of the component ssdpcgi. The manipulation leads to command injection. The attack may be initiated remotely. The exploit has been disclosed to the public and may be used.
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Analysis
by VulDB Data Team • 08/19/2025
The vulnerability identified as CVE-2025-8956 represents a critical command injection flaw within the D-Link DIR-818L router firmware version 1.05B01 and potentially earlier versions. This security weakness resides in the ssdpcgi component of the router's web interface, specifically within the getenv function located in the /htdocs/cgibin directory. The vulnerability stems from inadequate input validation and sanitization mechanisms that fail to properly handle user-supplied data, creating an exploitable condition where malicious commands can be executed with the privileges of the web server process. The affected device operates as a consumer-grade wireless router, making it a common target for attackers seeking to compromise home and small office networks.
The technical exploitation of this vulnerability occurs through the manipulation of input parameters that are processed by the getenv function within the ssdpcgi component. When user-provided data is not properly sanitized before being passed to system commands, attackers can inject malicious commands that are subsequently executed by the underlying operating system. This command injection vulnerability allows remote attackers to execute arbitrary code on the affected device without requiring authentication, as the vulnerability can be triggered through web interface interactions. The attack vector is particularly dangerous because it enables remote code execution, potentially allowing attackers to gain full control over the router's functionality, access network traffic, modify router settings, or establish persistent backdoors for future exploitation.
The operational impact of this vulnerability extends beyond simple device compromise, as it can lead to significant network security breaches and unauthorized access to connected systems. An attacker who successfully exploits this vulnerability can potentially redirect network traffic, monitor communications, modify firewall rules, or even use the compromised router as a pivot point to attack other devices within the local network. This makes the vulnerability particularly concerning for enterprise environments where D-Link routers may be deployed without proper security monitoring. The public disclosure of the exploit increases the risk of widespread exploitation, as malicious actors can readily leverage this knowledge to target vulnerable installations. The affected firmware version 1.05B01 represents a specific release that contains this flaw, indicating that manufacturers may have introduced or failed to address the vulnerability in their software development lifecycle.
Organizations and individuals should immediately implement mitigations to protect against exploitation of this vulnerability, including updating to the latest firmware version released by D-Link, which should contain patches addressing the command injection flaw. Network segmentation and firewall rules can help limit the impact if a device is compromised, while monitoring for unusual network activity or unauthorized configuration changes can aid in early detection of exploitation attempts. The vulnerability aligns with CWE-77 and CWE-94 categories, representing command injection and code injection flaws respectively, and maps to ATT&CK techniques including T1059 for command and scripting interpreter and T1021 for remote services. Security professionals should also consider implementing network-based intrusion detection systems to monitor for exploitation attempts targeting this specific vulnerability. Given the public availability of the exploit, immediate remediation is essential to prevent unauthorized access to affected network infrastructure and protect against potential data breaches or network disruption attacks.