EUVD-2026-12060
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
3Description
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.24.0, the gdi_surface_bits() function processes SURFACE_BITS_COMMAND messages sent by the RDP server. When the command is handled using NSCodec, the bmp.width and bmp.height values provided by the server are not properly validated against the actual desktop dimensions. A malicious RDP server can supply crafted bmp.width and bmp.height values that exceed the expected surface size. Because these values are used during bitmap decoding and memory operations without proper bounds checking, this can lead to a heap buffer overflow. Since the attacker can also control the associated pixel data transmitted by the server, the overflow may be exploitable to overwrite adjacent heap memory. This vulnerability is fixed in 3.24.0.
Analysis
Heap overflow in FreeRDP gdi_surface_bits() before 3.24.0.
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Remediation
Within 24 hours: Identify and inventory all systems running FreeRDP versions prior to 3.24.0 using network scanning and asset management tools; disable RDP access where not operationally critical. Within 7 days: Implement network segmentation to restrict RDP traffic to trusted sources only; deploy enhanced monitoring on systems that must retain RDP functionality. …
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External POC / Exploit Code
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