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high advisory

Multiple Vulnerabilities in FreeRDP Allow for DoS and Potential Code Execution

A remote, anonymous attacker can exploit multiple vulnerabilities in FreeRDP to cause a denial of service or potentially execute arbitrary program code.

Multiple vulnerabilities exist within FreeRDP, a free implementation of the Remote Desktop Protocol (RDP). An unauthenticated, remote attacker can exploit these vulnerabilities to achieve a denial-of-service (DoS) condition on a vulnerable system, or potentially gain the ability to execute arbitrary code. While the specific CVEs are not detailed in this brief, the generic nature of RDP exploitation makes it a high-impact concern. This issue came to light on March 24, 2026, and is a potential risk to any system using FreeRDP if not mitigated by appropriate updates and security practices. Because of the ubiquitous nature of RDP, this poses a significant risk to organizations using affected versions.

Attack Chain

  1. Attacker identifies a vulnerable FreeRDP server exposed to the network.
  2. Attacker establishes an RDP connection to the target server on port 3389 (default).
  3. Attacker sends a series of crafted RDP packets designed to exploit a specific vulnerability in FreeRDP’s processing of session data.
  4. If successful, the exploit triggers a buffer overflow or other memory corruption issue within the FreeRDP process.
  5. The attacker leverages the memory corruption to overwrite critical program data or inject malicious code into the process’s memory space.
  6. The injected code is executed, granting the attacker control over the FreeRDP session or potentially the entire system, depending on the specific vulnerability and the privileges of the FreeRDP process.
  7. Alternatively, the crafted packets could cause the FreeRDP service to crash, resulting in a denial-of-service condition.
  8. The attacker may then attempt to escalate privileges, install malware, or move laterally within the network.

Impact

Successful exploitation can lead to a denial-of-service condition, disrupting remote access services. More critically, attackers may be able to execute arbitrary code, leading to full system compromise. This could allow attackers to steal sensitive data, install ransomware, or use the compromised system as a foothold for further attacks within the network. The number of potentially affected systems is large, given the widespread use of RDP for remote administration and access.

Recommendation

  • Monitor network connections for suspicious RDP traffic, especially connections originating from unexpected sources; deploy the provided network connection Sigma rule.
  • Implement network segmentation to limit the exposure of RDP services to only authorized networks and users.
  • Audit RDP usage for anomalies and suspicious activity, paying close attention to unexpected processes launched by RDP sessions; leverage process creation Sigma rule.
  • Ensure FreeRDP is updated to the latest version to patch known vulnerabilities.

Detection coverage 2

Detect Suspicious RDP Connection from Outside the Network

medium

Detects RDP connections initiated from outside the expected network range, potentially indicating unauthorized access attempts.

sigma tactics: initial_access techniques: T1190 sources: network_connection, windows

Detect Suspicious Process Creation via RDP Session

high

Detects the creation of suspicious processes (cmd.exe, powershell.exe) spawned by the RDP service, potentially indicating exploitation or lateral movement.

sigma tactics: execution techniques: T1059.001 sources: process_creation, windows

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