SonicWall GMS Virtual Appliance Vulnerable to Local Privilege Escalation
A local privilege escalation vulnerability in SonicWall's GMS Virtual Appliance allows attackers with initial code execution to gain root privileges.
Zero Day Initiative (ZDI) has disclosed a critical local privilege escalation vulnerability affecting SonicWall's Global Management System (GMS) Virtual Appliance. The flaw, assigned the identifier ZDI-26-531 and tracked as CVE-2026-66148, carries a CVSS score of 7.8, indicating a high severity.
To exploit this vulnerability, an attacker must first possess the ability to execute low-privileged code on the target GMS Virtual Appliance. Once this initial access is achieved, the attacker can then leverage the vulnerability to elevate their privileges to that of a root user. This would grant them complete control over the affected system.
The vulnerability stems from an issue in how the appliance handles its interface command. Specifically, the system fails to properly validate user-supplied input before using it in a system call. This lack of validation allows a malicious actor to inject commands that are then executed with elevated permissions, leading to arbitrary code execution in the context of the root user.
SonicWall has acknowledged the vulnerability and has released an update to address the issue. The company provided details on the fix via their Product Security Incident Response Team (PSIRT) portal, under the identifier SNWLID-2026-0011. Users of the GMS Virtual Appliance are strongly advised to apply the available update as soon as possible to mitigate the risk.
The disclosure timeline indicates that the vulnerability was initially reported to SonicWall on April 16, 2026. Following coordinated efforts between ZDI and SonicWall, the advisory was publicly released on August 11, 2026, with an update to the advisory also published on the same day. The research leading to the discovery of this flaw is credited to Brian Mariani from DigitalCanion SA.
This vulnerability highlights a common attack vector where insufficient input validation on administrative interfaces can lead to significant privilege escalation. While requiring initial code execution, the ability to gain root access from a low-privileged state makes this a potent threat for any organization relying on SonicWall's GMS for network management.
Organizations utilizing SonicWall GMS Virtual Appliances should prioritize applying the security update provided by SonicWall. In parallel, implementing robust security practices, such as strict access controls and regular security audits, can help prevent the initial compromise that would enable the exploitation of such vulnerabilities.
This new advisory from Zero Day Initiative details a specific local privilege escalation vulnerability, ZDI-26-532, affecting SonicWall Email Security. The vulnerability, assigned CVE-2026-66149, stems from improper validation of user-supplied strings within the updateNetIf function, allowing escalation to root privileges. SonicWall has released an update to address this specific flaw.
This new advisory from Zero Day Initiative details a local privilege escalation vulnerability (CVE-2026-66150) specifically within SonicWall Email Security, distinct from the GMS Virtual Appliance. The flaw, stemming from improper validation of snmp command handling, allows local attackers with existing code execution to gain root privileges. SonicWall has released an update to address this specific issue.