CVE-2026-76146 in Genian SSL PNS
Summary
by MITRE • 10/01/2026
An OS command injection vulnerability in Genian SSL PNS allows an attacker who knows only the client access ID, without the password, to execute arbitrary commands remotely
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Analysis
by VulDB Data Team • 10/01/2026
The identified vulnerability represents a critical security flaw within the Genian SSL Private Network Server (PNS) application, specifically manifesting as an operating system command injection. This type of vulnerability arises when an application constructs OS commands using input that has not been adequately sanitized or validated for malicious content. In this specific instance, the architectural design fails to properly isolate user-supplied data from system-level instructions, allowing external inputs to be interpreted directly by the underlying shell environment rather than being treated strictly as string parameters. This fundamental flaw in input handling creates a pathway for attackers to bypass intended application logic and interact with the host operating system at an elevated privilege level.
The severity of this vulnerability is significantly amplified by its low barrier to entry regarding authentication requirements. Typically, command injection vulnerabilities require some form of valid user credentials or session token to be exploited effectively. However, in this case, the attacker needs only a client access ID, which may be considered public information or easily discoverable through enumeration techniques, without possessing the corresponding password for that account. This characteristic transforms what might otherwise be an authenticated vulnerability into a remote code execution vector accessible by unauthenticated adversaries who have identified valid identifiers within the system's address space. The absence of strict authentication requirements for this specific attack vector indicates a severe lapse in access control and input validation mechanisms during the processing of client connection requests or administrative queries associated with those IDs.
From an operational perspective, successful exploitation allows an attacker to execute arbitrary commands on the server hosting the Genian SSL PNS software. This capability grants the adversary complete control over the affected system, enabling them to install backdoors, exfiltrate sensitive data stored on the machine, pivot into other parts of the internal network, or disrupt service availability by terminating critical processes. The impact extends beyond the immediate compromise of the server, as a compromised VPN gateway can serve as a foothold for lateral movement within an organization's infrastructure. Attackers may leverage this access to map internal networks, steal credentials from memory, or deploy ransomware, thereby escalating the scope of the breach from a single application flaw to a comprehensive organizational security incident.
This vulnerability aligns with Common Weakness Enumeration (CWE) identifier CWE-78, which describes Improper Neutralization of Special Elements used in an OS Command, commonly known as OS Command Injection. Furthermore, it maps directly to MITRE ATT&CK technique T1059, specifically sub-technique T1059.004 for Command and Scripting Interpretation, where attackers use system utilities or interpreters like bash, PowerShell, or cmd.exe to execute malicious commands. The exploitation path also reflects aspects of CWE-287, Improper Authentication, given that the attack proceeds without full credential verification, suggesting a failure in enforcing strict identity proof before processing sensitive operations.
Mitigation strategies must focus on immediate remediation and long-term architectural improvements. Vendors should release and apply security patches that address the input validation logic to ensure all user-supplied data is strictly validated against an allowlist of expected characters or formats before being passed to any OS command interpreter. Developers must avoid using system-level shell commands for application functionality where possible, opting instead for native API calls provided by programming languages which do not invoke a shell process. If shell execution is unavoidable, inputs must be rigorously escaped and sanitized to remove any special characters that could alter the intended command structure. Additionally, organizations should implement network segmentation to limit access to management interfaces of VPN appliances from untrusted networks and enforce multi-factor authentication for all administrative and client access points to reduce the attack surface even if such vulnerabilities exist in other components.