A vulnerability exists in the Buffalo Link Station version 1.85-0.01 that allows unauthenticated or guest-level users to enumerate valid usernames and their associated privilege roles. This vulnerability is triggered by modifying a parameter within requests sent to the /nasapi endpoint. With a CVSS score of 6.5, this vulnerability is classified as medium severity.
Risk to organizations includes unauthorized access to sensitive information, as attackers may leverage this vulnerability to gain insights into user accounts and their roles. Given the ease of exploitation, organizations should prioritize addressing this vulnerability.
Currently, there is no public exploit confirmed, and the vulnerability status is awaiting analysis. Nevertheless, organizations should act promptly to mitigate potential risks associated with this vulnerability.
Organizations should prioritize patching immediately to prevent any unauthorized access that could stem from this vulnerability.
Vulnerability Details
The official CVE description states that the vulnerability allows unauthenticated users to enumerate valid usernames and their associated privilege roles. This is a classic case of improper access control, which falls under CWE-639.
The CVSS score of 6.5 indicates a medium severity level, with a high impact on confidentiality but no impact on integrity or availability. The vulnerability can be exploited through a network, requiring low complexity and low privileges.
Affected products include Buffalo Link Station version 1.85-0.01, and the vulnerability was published on April 20, 2026.
Technical Analysis
The root cause of this vulnerability stems from insufficient access controls, allowing unauthenticated users to access sensitive information. The attack vector is network-based, exploiting the /nasapi endpoint.
The attack complexity is low, requiring minimal effort from the attacker. Privileges required are low, meaning that even guest-level access can facilitate exploitation. User interaction is not required, making this vulnerability particularly dangerous.
The vulnerability has a high confidentiality impact, allowing attackers to enumerate usernames and roles, which could lead to further attacks. There is no integrity or availability impact.
Risk & Impact Analysis
The deployment of this vulnerability can pose significant risks to organizations, especially those using Buffalo Link Station in sensitive environments. The ability to enumerate usernames can lead to unauthorized access or further targeted attacks.
Given the high confidentiality impact, organizations should assess their exposure and consider the potential blast radius of an exploit. The urgency for remediation is medium, as the vulnerability is currently not actively exploited but poses a risk.
Organizations should address this vulnerability in their priority patch cycle to mitigate the risks associated with potential exploitation. The CVSS score indicates a need for prompt action.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | Yes |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected version is Buffalo Link Station version 1.85-0.01. Organizations should ensure that they are updated to the latest version to mitigate this vulnerability.
Mitigation & Remediation
Organizations should prioritize patching the Buffalo Link Station to the latest version to remediate this vulnerability. If a patch is not available, consider implementing network controls to restrict access to the /nasapi endpoint.
Configuration hardening may also help mitigate risks. This includes disabling guest access and ensuring proper access controls are in place to prevent unauthorized enumeration of usernames.
Monitoring for unusual access patterns can provide additional security. Organizations should consider engaging in penetration testing to identify and remediate similar vulnerabilities.
Detection Guidance
To detect potential exploitation of this vulnerability, organizations should monitor logs for unusual requests to the /nasapi endpoint. Behavioral anomalies, such as repeated attempts to enumerate usernames, should be flagged.
Network signatures that identify unauthorized access attempts can also be beneficial in detecting exploitation attempts. Changes to user account settings or privilege assignments should be closely monitored.
AppSecure Threat Intelligence Insight
This vulnerability exemplifies the ongoing challenges organizations face regarding access controls in networked devices. The ability to enumerate usernames and roles can lead to further targeted attacks.
Security teams should take this opportunity to evaluate their access control mechanisms and ensure that they follow best practices for securing sensitive endpoints.
For enhanced security posture, organizations can benefit from adopting a penetration testing methodology that aligns with their risk profile.
Ultimately, staying informed about vulnerabilities and implementing robust security testing can significantly reduce the risks associated with unauthorized access attempts.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
.webp)