---
id: CVE-2026-121404
title: FreeRDP before 3.32.2 Shadow Server CPU Exhaustion via Zero-Length DVC DATA
summary: >-
  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…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-400
vendor: FreeRDP
product: FreeRDP
affected:
  - FreeRDP < 3.32.2
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-03T17:22:41.442755Z'
published: '2026-11-03'
updated: '2026-11-03'
sourceUpdated: '2026-11-03T18:30:55.780Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-121404'
references:
  - url: 'https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-fqcj-rwww-2498'
    label: GitHub Security Advisory (GHSA-fqcj-rwww-2498)
  - url: >-
      https://www.vulncheck.com/advisories/freerdp-before-3.32.2-shadow-server-cpu-exhaustion-via-zero-length-dvc-data
    label: >-
      VulnCheck Advisory: FreeRDP before 3.32.2 Shadow Server CPU Exhaustion via
      Zero-Length DVC DATA
tags:
  - cve.org
epss: 0.00383
epssPercentile: 0.32559
ingestedAt: '2026-11-05T20:33:06.360Z'
---

## Overview

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.

## Affected

- `FreeRDP < 3.32.2`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.