CVE-2023-47257 in ScreenConnect
Summary
by MITRE • 02/02/2024
ConnectWise ScreenConnect through 23.8.4 allows man-in-the-middle attackers to achieve remote code execution via crafted messages.
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Analysis
by VulDB Data Team • 02/22/2026
The vulnerability identified as CVE-2023-47257 affects ConnectWise ScreenConnect versions up to 23.8.4, representing a critical security flaw that enables man-in-the-middle attackers to achieve remote code execution through the manipulation of network traffic. This vulnerability resides within the communication protocols used by ScreenConnect for remote desktop management and support services, creating an attack vector that can be exploited by adversaries positioned between the client and server components of the system.
The technical implementation of this vulnerability stems from insufficient validation of message integrity and authentication mechanisms within the ScreenConnect protocol stack. Attackers can craft malicious messages that exploit weaknesses in the cryptographic handshake processes and session management components, allowing them to inject arbitrary code into the target system. This flaw specifically targets the secure communication channels that ScreenConnect establishes between remote clients and managed endpoints, where proper certificate validation and message authentication codes may be bypassed or improperly implemented. The vulnerability operates at the network layer where encrypted communications are established, making it particularly dangerous as it can be exploited without requiring prior authentication or access to the target network.
The operational impact of CVE-2023-47257 extends beyond simple remote code execution capabilities, as it provides attackers with persistent access to managed systems and potentially enables lateral movement within network environments. Organizations using ScreenConnect for remote desktop support, IT management, and system administration are at significant risk, as this vulnerability can be exploited to gain unauthorized access to critical infrastructure. The attack surface is particularly concerning for enterprises that rely heavily on remote desktop solutions for their operational continuity, as successful exploitation can lead to complete system compromise, data exfiltration, and potential disruption of business operations. This vulnerability aligns with CWE-310, which addresses cryptographic weaknesses in authentication and session management, and represents a clear violation of secure communication principles.
Mitigation strategies for CVE-2023-47257 require immediate action including updating to the latest version of ConnectWise ScreenConnect where the vulnerability has been patched, implementing network monitoring to detect anomalous communication patterns, and strengthening certificate validation processes. Organizations should also consider deploying additional security controls such as network segmentation, intrusion detection systems, and mandatory access controls to limit the potential impact of successful exploitation. The remediation process should include comprehensive network traffic analysis to identify any potential compromise, followed by thorough system integrity checks and credential rotation. Security teams should also review their incident response procedures to ensure preparedness for potential exploitation attempts, as this vulnerability can be leveraged for advanced persistent threats that may remain undetected for extended periods. The ATT&CK framework categorizes this vulnerability under T1071.004 for application layer protocols and T1566 for credential harvesting, highlighting the multi-faceted nature of the threat landscape this vulnerability creates.