CVE-2025-29519 in DSL-7740C
Summary
by MITRE • 08/26/2025
A command injection vulnerability in the EXE parameter of D-Link DSL-7740C with firmware DSL7740C.V6.TR069.20211230 allows attackers to execute arbitrary commands via supplying a crafted GET request.
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Analysis
by VulDB Data Team • 09/03/2025
This vulnerability resides within the D-Link DSL-7740C broadband router firmware version DSL7740C.V6.TR069.20211230 where a command injection flaw exists in the EXE parameter handling. The vulnerability stems from insufficient input validation and sanitization mechanisms that fail to properly escape or filter user-supplied data before incorporating it into system commands. This allows an attacker to inject malicious commands through a specially crafted GET request that targets the vulnerable EXE parameter, potentially enabling full system compromise.
The technical implementation of this vulnerability aligns with CWE-77 and CWE-94 categories, representing command injection and improper neutralization of special elements used in OS commands respectively. Attackers can exploit this weakness by crafting HTTP GET requests containing malicious payloads in the EXE parameter, which when processed by the router's web interface, get executed with the privileges of the web server process. This creates a significant attack surface that could be leveraged for remote code execution, system reconnaissance, and privilege escalation attacks.
The operational impact of this vulnerability extends beyond simple command execution as it provides attackers with potential access to sensitive system information, network configuration data, and the ability to modify router settings. Given that this affects a broadband router device, successful exploitation could enable attackers to gain persistent access to the local network, potentially leading to man-in-the-middle attacks, DNS hijacking, or further lateral movement within the network infrastructure. The vulnerability is particularly concerning as it allows unauthenticated remote code execution, making it an attractive target for automated exploitation campaigns.
Mitigation strategies should include immediate firmware updates from D-Link to address the command injection vulnerability, network segmentation to limit access to critical network devices, and implementation of web application firewalls to detect and block malicious requests targeting the vulnerable parameter. Network administrators should also monitor for suspicious traffic patterns and implement intrusion detection systems to identify potential exploitation attempts. The vulnerability demonstrates the critical importance of input validation and proper sanitization of user-supplied data in web applications, particularly in network infrastructure devices where the consequences of exploitation can be severe. Organizations should also consider implementing zero-trust network architectures and regularly conducting security assessments of network devices to identify and remediate similar vulnerabilities before they can be exploited by threat actors.