CVE-2026-90881 in DIR-882
Summary
by MITRE • 09/15/2026
A weakness has been identified in D-Link DIR-882 up to 20260814. Impacted is the function main of the file /HNAP1/dllog.cgi of the component CGI Binary. Executing a manipulation can lead to information disclosure. The attack may be launched remotely. The exploit has been made available to the public and could be used for attacks.
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Analysis
by VulDB Data Team • 09/15/2026
The D-Link DIR-882 router, specifically firmware versions up to build 20260814, contains a critical security vulnerability within its Common Gateway Interface (CGI) binary component. The flaw resides in the main function of the script located at /HNAP1/dllog.cgi. This specific file is part of the Home Network Administration Protocol implementation, which serves as an interface for managing router settings and retrieving status information from remote administrators or applications. The presence of this vulnerability indicates a failure in input validation and sanitization processes within the CGI handler, allowing attackers to manipulate requests sent to this endpoint.
The technical nature of this weakness is classified under CWE-200, which covers Exposure of Sensitive Information to an Unauthorized Actor. When an attacker sends a crafted request to the /HNAP1/dllog.cgi endpoint, the application fails to properly restrict access or sanitize input data before processing it. This lack of proper controls results in the unintended disclosure of internal system information. The specific type of information disclosed may include sensitive configuration details, network topology maps, connected device identifiers, or potentially authentication tokens depending on the exact implementation flaws within the logging mechanism. Such exposure provides adversaries with valuable intelligence that can be leveraged for further exploitation phases.
From an operational perspective, this vulnerability poses a significant risk to users who rely on the DIR-882 for secure home networking. Because the attack vector is remote, an attacker does not need physical access to the device or prior authentication credentials in many scenarios associated with such CGI flaws. The availability of public exploits significantly lowers the barrier to entry for malicious actors, increasing the likelihood of automated attacks targeting vulnerable devices across the internet. Once sensitive information is extracted, it can be used to facilitate more severe attacks, including privilege escalation, session hijacking, or targeted phishing campaigns against specific users based on their network configuration and connected devices.
This vulnerability aligns with MITRE ATT&CK technique T1087, specifically Account Discovery, as well as potential aspects of Information Collection if the disclosed data includes system logs or user activity records. The exposure of such internal details aids adversaries in mapping the victim's environment, which is a critical step in reconnaissance during an attack lifecycle. Without immediate mitigation, these routers remain susceptible to exploitation by automated bots scanning for known vulnerable firmware versions and CGI endpoints that lack proper access controls.
To mitigate this risk, users should immediately update their D-Link DIR-882 router firmware to the latest version released after August 14, 2026, which addresses the input validation issues in the HNAP implementation. If updating is not immediately possible, administrators can consider disabling remote management features and restricting access to the web interface to local network segments only. Additionally, implementing a Web Application Firewall with rules targeting suspicious patterns directed at /HNAP1/dllog.cgi may provide temporary protection against exploitation attempts while patches are applied. Regular monitoring of router logs for unusual outbound traffic or unauthorized configuration changes is also recommended to detect potential compromise early.