CVE-2026-2037 is a critical vulnerability classified under CWE-502 (Deserialization of Untrusted Data) affecting GFI Archiver version 15.10. The vulnerability exists in the MArc.Core.Remoting.exe process, which listens on TCP port 8017 and handles serialized data without proper validation. This flaw allows remote attackers to send crafted serialized objects that, when deserialized by the application, lead to arbitrary code execution in the context of the SYSTEM user. Although the attack requires authentication, the authentication mechanism can be bypassed, effectively allowing unauthenticated remote code execution. The vulnerability is particularly dangerous because deserialization issues often allow attackers to execute arbitrary commands, escalate privileges, and gain persistent control over the affected system. The CVSS v3.0 score is 8.8, reflecting high impact on confidentiality, integrity, and availability, with low attack complexity and no user interaction required. No public patches or exploits have been reported yet, but the vulnerability was reserved and published in February 2026 by ZDI (ZDI-CAN-27935).

The impact of this vulnerability is severe for organizations running GFI Archiver 15.10. Successful exploitation allows attackers to execute arbitrary code with SYSTEM privileges, potentially leading to full system compromise, data theft, destruction, or ransomware deployment. Since GFI Archiver is used for email archiving and compliance, attackers could also access sensitive archived communications, violating confidentiality and regulatory requirements. The ability to bypass authentication increases the risk of exploitation by external threat actors. This could disrupt business operations, cause data breaches, and damage organizational reputation. The vulnerability affects availability by enabling attackers to disrupt or disable archiving services, impacting compliance and legal discovery processes.

Organizations should immediately assess their use of GFI Archiver version 15.10 and restrict access to the MArc.Core.Remoting.exe service on port 8017 using network segmentation and firewall rules to limit exposure to trusted hosts only. Since no patches are currently available, consider disabling or isolating the vulnerable service if feasible. Monitor network traffic for unusual activity targeting port 8017 and implement intrusion detection/prevention systems (IDS/IPS) with signatures for suspicious deserialization attempts. Enforce strong authentication and multi-factor authentication (MFA) on all GFI Archiver interfaces to reduce risk of bypass. Regularly audit and review logs for signs of exploitation attempts. Plan for rapid deployment of vendor patches once released. Additionally, conduct security awareness training for administrators to recognize and respond to potential exploitation indicators.