CVE-2026-23884

CRITICAL

FreeRDP < 3.21.0 - Use-After-Free in Offscreen Bitmap Deletion

Title source: llm
STIX 2.1

Description

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.21.0, offscreen bitmap deletion leaves `gdi->drawing` pointing to freed memory, causing UAF when related update packets arrive. A malicious server can trigger a client‑side use after free, causing a crash (DoS) and potential heap corruption with code‑execution risk depending on allocator behavior and surrounding heap layout. Version 3.21.0 contains a patch for the issue.

References (20)

Core 20
Core References

Scores

CVSS v3 9.8
EPSS 0.0040
EPSS Percentile 33.0%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-416
Status published
Products (2)
freerdp/freerdp < 3.21.0
FreeRDP/FreeRDP < 3.21.0
Published Jan 19, 2026
Tracked Since Feb 18, 2026