Description
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.
Published: 2026-11-03
Score: 7.1 High
EPSS: < 1% Very Low
KEV: No
AI Analysis

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Remediation

No solution or workaround provided in the CVE record.

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Tracking

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Advisories

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History

Wed, 04 Nov 2026 12:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-835
References
Metrics threat_severity

None

threat_severity

Moderate


Tue, 03 Nov 2026 19:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 03 Nov 2026 14:45:00 +0000

Type Values Removed Values Added
Description 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.
Title FreeRDP before 3.32.2 Shadow Server CPU Exhaustion via Zero-Length DVC DATA
First Time appeared Freerdp
Freerdp freerdp
Weaknesses CWE-400
CPEs cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:*
Vendors & Products Freerdp
Freerdp freerdp
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 7.1, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-11-03T18:30:55.780Z

Reserved: 2026-11-03T12:27:30.908Z

Link: CVE-2026-121404

cve-icon Vulnrichment

Updated: 2026-11-03T17:23:01.879Z

cve-icon NVD

Status : Analyzed

Published: 2026-11-03T15:17:28.870

Modified: 2026-11-03T19:18:02.047

Link: CVE-2026-121404

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-11-03T14:28:06Z

Links: CVE-2026-121404 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-11-04T14:30:15Z

Weaknesses
  • CWE-400

    Uncontrolled Resource Consumption

  • CWE-835

    Loop with Unreachable Exit Condition ('Infinite Loop')