CVE-2026-73753 in AOS-CX
Summary
by MITRE • 09/02/2026
Exploitation through affected command-line operations could allow an authenticated low-privileged user to execute arbitrary commands as a privileged user on the underlying operating system.
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Analysis
by VulDB Data Team • 09/02/2026
The vulnerability described represents a critical privilege escalation flaw within software that processes specific command-line inputs. This issue stems from improper validation or sanitization of arguments passed through affected command-line operations, allowing an attacker who has already gained authenticated access with low-privileged credentials to manipulate the execution context. By crafting malicious input strings, the user can bypass intended security controls and inject arbitrary commands into the system's processing pipeline. The core technical flaw lies in the failure to enforce strict separation between data and code during command interpretation, a classic instance of CWE-78 Improper Neutralization of Special Elements used in an OS Command Injection. This lack of input validation permits the injection of shell metacharacters or other control sequences that alter the intended behavior of the underlying operating system commands.
From an operational perspective, this vulnerability poses a severe risk to organizational security posture because it effectively neutralizes the benefits of least-privilege access models. An attacker exploiting this flaw does not need elevated credentials initially; they only require standard user-level authentication. Once exploited, the malicious code executes with the privileges of the service or application running the command-line operation, which is typically a high-privileged account such as root on Linux systems or SYSTEM on Windows environments. This capability allows for complete compromise of the host system, including access to sensitive data, installation of persistent backdoors, lateral movement across the network, and disruption of critical services. The attack vector aligns with ATT&CK technique T1059 Command and Scripting Interpreter, specifically where an adversary uses native command-line tools or scripts to execute arbitrary code after gaining initial foothold through lower-privileged accounts.
Mitigation strategies must focus on both immediate remediation and long-term architectural improvements. The primary fix involves updating the affected software to a version that implements rigorous input validation and output encoding for all user-supplied data processed by these command-line operations. Developers should avoid passing unsanitized user input directly to system commands; instead, they should use safe APIs or functions that do not invoke shell interpreters when possible. If shell invocation is unavoidable, strict allow-listing of permitted characters and values must be enforced to ensure only expected inputs are processed. Additionally, organizations should implement principle of least privilege by ensuring the application runs under a dedicated service account with minimal permissions rather than high-privileged system accounts. Regular security code reviews focusing on command injection patterns and automated static analysis tools can help identify similar vulnerabilities before deployment. Monitoring for unusual process creation events associated with low-privilege users spawning privileged processes is also recommended to detect potential exploitation attempts in real-time.