CVE-2021-41159: Improper client input validation for FreeRDP gateway connections allows to overwrite memory
FreeRDP is a free implementation of the Remote Desktop Protocol (RDP), released under the Apache license. All FreeRDP clients prior to version 2.4.1 using gateway connections (/gt:rpc) fail to validate input data. A malicious gateway might allow client memory to be written out of bounds. This issue has been resolved in version 2.4.1. If you are unable to update then use /gt:http rather than /gt:rdp connections if possible or use a direct connection without a gateway.
Affected Software
Event History
Frequently Asked Questions
What is CVE-2021-41159?
CVE-2021-41159 is a vulnerability that affects all FreeRDP clients prior to version 2.4.1.
What is FreeRDP?
FreeRDP is a free implementation of the Remote Desktop Protocol (RDP) released under the Apache license.
How does CVE-2021-41159 impact FreeRDP?
CVE-2021-41159 allows a malicious gateway to write client memory out of bounds in FreeRDP clients using gateway connections (`/gt:rpc`).
What is the severity of CVE-2021-41159?
CVE-2021-41159 has a severity rating of 8.8 (high).
How do I fix CVE-2021-41159?
To fix CVE-2021-41159, users should update their FreeRDP clients to version 2.4.1 or later.