neutrinolabs xrdp 0.9.21/0.10.0/0.10.5/0.10.6 RDP protocol totalLength resource consumption

Summaryinfo

A vulnerability classified as critical was found in neutrinolabs xrdp. Affected by this vulnerability is an unknown functionality of the component RDP protocol. The manipulation of the argument totalLength results in resource consumption. This vulnerability was named CVE-2026-54538. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability was found in neutrinolabs xrdp. It has been classified as critical. Affected is an unknown function of the component RDP protocol. The manipulation of the argument totalLength with an unknown input leads to a resource consumption vulnerability. CWE is classifying the issue as CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. This is going to have an impact on availability. CVE summarizes:

xrdp is an open source RDP server. In versions 0.10.6 and prior, a n issue was discovered where the software fails to properly validate the totalLength field within the RDP protocol control header during packet reception. An unauthenticated remote attacker can exploit this vulnerability by sending a specially crafted packet that forces the xrdp process or thread into an infinite, CPU-bound loop. Because the internal pointer fails to advance and the deadlock prevention mechanism is bypassed for specific protocol data unit types, the process consumes excessive CPU resources indefinitely. This can render the xrdp service unavailable and potentially lead to system-wide resource exhaustion if multiple malicious connections are established. This issue has been fixed in version 0.10.6.1.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-54538 since 06/15/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1499.

Upgrading to version 0.10.6.1 eliminates this vulnerability.

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Productinfo

Vendor

• neutrinolabs

Name

• xrdp

Version

• 0.9.21
• 0.10.0
• 0.10.5
• 0.10.6

Website

• Product: https://github.com/neutrinolabs/xrdp/

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