CVE-2026-23884

EUVD-2026-3310

19.01.2026, 18:16

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.

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
NIST	Primary	9.8 CRITICAL	NETWORK	LOW	NONE	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Base Score

CVSS 3.x

EPSS Score

Percentile: 37%

Affected Products (NVD)

Vendor	Product	Version
freerdp	freerdp	𝑥 < 3.21.0

𝑥

= Vulnerable software versions

Debian Releases

Debian Product

Codename

freerdp2

bookworm	no-dsa
bullseye	vulnerable
bullseye (security)	vulnerable
trixie	no-dsa

freerdp3

bookworm	no-dsa
forky	3.23.0+dfsg-1 fixed
sid	3.23.0+dfsg-1 fixed
trixie	no-dsa

Known Exploits!

https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-cfgj-vc84-f3pp

Common Weakness Enumeration

CWE-416 - Use After Free
Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code.

References

https://github.com/FreeRDP/FreeRDP/blob/3370e30e92a021eb680892dda14d642bc8b8727c/libfreerdp/cache/offscreen.c#L114-L122

https://github.com/FreeRDP/FreeRDP/blob/3370e30e92a021eb680892dda14d642bc8b8727c/libfreerdp/cache/offscreen.c#L87-L91

https://github.com/FreeRDP/FreeRDP/releases/tag/3.21.0

https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-cfgj-vc84-f3pp