CVE-2026-121404

MEDIUM 6.5

FreeRDP before 3.32.2 Shadow Server CPU Exhaustion via Zero-Length DVC DATA

CVSS Score

6.5

EPSS Score

0.0%

EPSS Percentile

0th

FreeRDP before 3.32.2 contains a denial of service vulnerability in the shadow server that allows authenticated RDP clients to spin server threads by sending zero-length drdynvc DATA PDUs. Attackers can send empty DATA messages on opened audin or rdpgfx channels, so that FreeRDP_WTSVirtualChannelRead never consumes them, consuming full CPU cores until disconnect.

CWE	CWE-400
Vendor	freerdp
Product	freerdp
Published	Nov 3, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Affected Versions

FreeRDP / FreeRDP

0 < 3.32.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-fqcj-rwww-2498 vulncheck.com: https://www.vulncheck.com/advisories/freerdp-before-3.32.2-shadow-server-cpu-exhaustion-via-zero-length-dvc-data

Credits

Kushalkhemka mayank-jangid-moon skigeek16 opensec-intelligence