D-Link DIR-868L B1 router firmware version FW2.05WWB02 contains an unauthenticated OS command injection vulnerability in the fileaccess.cgi component....
Description
D-Link DIR-868L B1 router firmware version FW2.05WWB02 contains an unauthenticated OS command injection vulnerability in the fileaccess.cgi component. The endpoint /dws/api/UploadFile accepts a pre_ap...
AI Analyst Comment
Remediation
Update Unknown Multiple Products to the latest version. Monitor for exploitation attempts and review access logs.
Executive Summary:
A critical vulnerability has been discovered in certain D-Link router firmware, allowing an unauthenticated attacker to execute arbitrary commands and gain complete control of the device. Successful exploitation could lead to total network compromise, data theft, and service disruption. Due to the ease of exploitation and critical severity, immediate action is required to mitigate this threat.
Vulnerability Details
CVE-ID: CVE-2025-55583
Affected Software: D-Link DIR-868L B1 Router (and potentially other products)
Affected Versions: Firmware version FW2.05WWB02. See vendor advisory for a complete list of affected products and versions.
Vulnerability: This is an unauthenticated operating system (OS) command injection vulnerability. The flaw exists within the
fileaccess.cgicomponent, specifically at the/dws/api/UploadFileendpoint. An attacker on the same network can send a specially crafted request to this endpoint without needing any credentials, embedding malicious OS commands within a request parameter. The router's underlying operating system fails to properly sanitize this input and executes the commands with system-level privileges, granting the attacker full administrative control over the device.Business Impact
This vulnerability is rated as critical severity with a CVSS score of 9.8. A successful exploit would have a severe impact on business operations, confidentiality, and integrity. An attacker could gain complete control of the network gateway, allowing them to intercept, monitor, or redirect all internet traffic, steal sensitive credentials and data, pivot to attack other internal network devices, or use the compromised router as part of a botnet for larger attacks. The risk extends beyond data loss to include significant reputational damage and potential regulatory penalties.
Remediation Plan
Immediate Action: Immediately identify all affected D-Link devices and update them to the latest patched firmware version provided by the vendor. After patching, monitor device logs for any signs of compromise that may have occurred prior to the update, specifically reviewing access logs for unusual requests to
fileaccess.cgi.Proactive Monitoring:
/dws/api/UploadFileorfileaccess.cgiendpoints, paying close attention to requests originating from untrusted IP addresses or containing unusual patterns.Compensating Controls:
If immediate patching is not feasible, implement the following controls:
/dws/api/UploadFileendpoint.Exploitation Status
Public Exploit Available: False
Analyst Notes: As of the publication date of this vulnerability (Aug 28, 2025), there are no known public proof-of-concept exploits or active exploitation campaigns in the wild. However, given the critical severity and the fact that it is an unauthenticated vulnerability, it is highly probable that threat actors will develop exploits in the near future.
Analyst Recommendation
This vulnerability poses a critical and immediate threat to the security of any network using the affected devices. Given the CVSS score of 9.8, organizations must treat the remediation of this vulnerability as their highest priority. Although this CVE is not yet on the CISA KEV list, its characteristics make it an attractive target for widespread exploitation. We strongly recommend applying the vendor-supplied patches immediately and implementing the suggested monitoring controls to detect and prevent any potential compromise.