CVE-2025-8949 in DIR-825
Summary
by MITRE • 08/14/2025
A vulnerability was identified in D-Link DIR-825 2.10. Affected by this vulnerability is the function get_ping_app_stat of the file ping_response.cgi of the component httpd. The manipulation of the argument ping_ipaddr leads to stack-based buffer overflow. The attack can be launched remotely. The exploit has been disclosed to the public and may be used. This vulnerability only affects products that are no longer supported by the maintainer.
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Analysis
by VulDB Data Team • 08/19/2025
The vulnerability CVE-2025-8949 represents a critical stack-based buffer overflow flaw in the D-Link DIR-825 router model running firmware version 2.10. This issue resides within the httpd web server component and specifically affects the get_ping_app_stat function in the ping_response.cgi file. The vulnerability stems from inadequate input validation when processing the ping_ipaddr argument, creating a condition where maliciously crafted input can exceed the bounds of a fixed-size buffer allocated on the stack. This particular flaw demonstrates the classic characteristics of a CWE-121 stack-based buffer overflow vulnerability, where insufficient bounds checking allows attackers to overwrite adjacent memory locations and potentially execute arbitrary code.
The remote exploitation capability of this vulnerability presents significant operational risks for affected networks, as attackers can leverage the web interface of the router to deliver malicious payloads without requiring physical access or local network presence. The fact that this exploit has been publicly disclosed indicates that threat actors have likely developed working attack vectors against vulnerable devices. This vulnerability affects only unsupported products, meaning D-Link has ceased providing security updates for the DIR-825 model, leaving users exposed to potential compromise. The combination of remote exploitability, public disclosure, and lack of vendor support creates a high-risk scenario where unpatched routers could be easily compromised for use in botnets or as stepping stones for further network infiltration.
The operational impact of CVE-2025-8949 extends beyond simple denial of service, as stack-based buffer overflows can potentially lead to complete system compromise and persistent backdoor access. Attackers could leverage this vulnerability to gain unauthorized administrative access to the router, enabling them to modify network configurations, redirect traffic, or establish persistent command and control channels. The attack surface is particularly concerning given that routers serve as core network infrastructure devices, making successful exploitation potentially devastating for network security. Organizations should consider this vulnerability in the context of the ATT&CK framework, specifically under T1046 network service scanning and T1059 command and control, as compromised routers can become valuable assets for attackers seeking to maintain persistent access and conduct further reconnaissance.
Mitigation strategies for this vulnerability should prioritize immediate hardware replacement or upgrade to supported router models, as no patches exist for the unsupported DIR-825 firmware. Network segmentation and firewall rules should be implemented to limit access to router management interfaces, while continuous monitoring for unusual network behavior or unauthorized configuration changes remains essential. Security teams should also consider implementing network detection rules targeting known exploit signatures and anomalous traffic patterns associated with the ping_response.cgi endpoint. Given the public disclosure status of this vulnerability, organizations should assume that exploitation is actively occurring in the wild and treat affected devices as compromised until confirmed otherwise through proper security assessment procedures.