DEBIAN-CVE-2026-121393: High severity debian/freerdp2 vulnerability
FreeRDP from 3.0.0 before 3.32.2 contains a denial of service vulnerability that allows malicious RDP servers to abort clients built with verbose WinPR assertions by sending crafted RemoteFX region rectangles. Attackers can supply a rectangle with x set to 65535 alongside a SurfaceBits destination left of 1, triggering a 16-bit coordinate assertion in rfxprocessmessage that terminates the client process.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
debian/freerdp3to a version that resolves this vulnerability.Fixed in 3.32.2+dfsg-1
Event History
Frequently Asked Questions
Who is exposed to this issue?
FreeRDP clients in the affected version range are exposed when they connect to a malicious RDP server. The denial of service specifically affects clients built with verbose WinPR assertions.
What must an attacker do to trigger the crash?
The attacker must operate or control an RDP server that the victim connects to. The server sends crafted RemoteFX region rectangles, including an x coordinate of 65535 with a SurfaceBits destination left of 1, to trigger an assertion and terminate the client process.
Are connections to ordinary RDP servers affected?
The provided information describes a client-side crash caused by malicious RDP server responses. It does not indicate that a normal server or merely having FreeRDP installed is sufficient to trigger the issue.
What version resolves the issue?
FreeRDP versions before 3.32.2 are affected according to the provided data. Updating to 3.32.2 or later resolves the stated affected range.