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CVE-2026-121400— FreeRDP before 3.32.2 CPU Exhaustion via RDG Control Packet

Quick assessment

Affected

FreeRDP FreeRDP

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

FreeRDP 3.32.2 之前的版本在函数中存在拒绝服务漏洞。恶意 RD 网关可通过发送不完整的保活控制数据包，耗尽客户端 CPU 资源。攻击者在完成 RDG 隧道建立交换后，会发送一个包含为的八字节头部，并故意不发送数据包主体，从而触发一个无进度限制的读取循环，导致客户端的一个线程以 100% CPU 占用率持续空转。

CVSS 6.5 · Medium Updated Nov 04, 2026

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

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Vulnerability Information

Have questions about the vulnerability? See if Shenlong's analysis helps!

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Vulnerability Title

FreeRDP before 3.32.2 CPU Exhaustion via RDG Control Packet

Source: CVE Program / CVE List V5

Vulnerability Description

FreeRDP before 3.32.2 contains a denial-of-service vulnerability in rdg_process_control_packet that allows a malicious RD Gateway to exhaust client CPU by sending an incomplete keepalive control packet. Attackers completing the RDG tunnel-open exchange then send an eight-byte header with packetLength 0xFFFF and withhold the body, causing an unbounded no-progress read loop that spins one client thread at full CPU.

Source: CVE Program / CVE List V5

CVSS Information

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

Source: CVE Program / CVE List V5

Vulnerability Type

不可达退出条件的循环(无限循环)

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
FreeRDP	FreeRDP	0 ~ 3.32.2	-

II. Public POCs for CVE-2026-121400

#	POC Description	Source Link	Shenlong Link

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No public POC found.

III. Intelligence Information for CVE-2026-121400

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Other References for CVE-2026-121400 (2)

https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-x4x6-2hrm-hvq9 vendor-advisory
https://www.vulncheck.com/advisories/freerdp-before-3.32.2-cpu-exhaustion-via-rdg-control-packet third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-121400

Same Patch Batch · FreeRDP · 2026-11-03 · 27 CVEs total

CVE-2026-121386	7.5 HIGH	FreeRDP before 3.32.2 Denial of Service via WinPR PNG/JPEG Image Readers
CVE-2026-121392	7.4 HIGH	FreeRDP before 3.32.2 Certificate Identity Validation Bypass via tls_verify_certificate
CVE-2026-121395	6.5 MEDIUM	FreeRDP 3.17.0 before 3.32.2 Denial of Service via RemoteFX Decoder
CVE-2026-121404	6.5 MEDIUM	FreeRDP before 3.32.2 Shadow Server CPU Exhaustion via Zero-Length DVC DATA
CVE-2026-121412	6.5 MEDIUM	FreeRDP 3.0.0 before 3.32.2 Proxy Memory Exhaustion via DVC Reassembly
CVE-2026-121407	6.5 MEDIUM	FreeRDP before 3.32.2 Shadow Server Denial of Service via remdesk Channel
CVE-2026-121393	6.5 MEDIUM	FreeRDP 3.0.0 before 3.32.2 Denial of Service via RemoteFX Region Assertion
CVE-2026-121402	6.5 MEDIUM	FreeRDP before 3.32.2 X11 Client Crash via Zero-Width RDPGFX ResetGraphics
CVE-2026-121394	6.5 MEDIUM	FreeRDP before 3.32.2 Denial of Service via RemoteFX RLGR decoder
CVE-2026-121388	6.5 MEDIUM	FreeRDP 3.0.0 before 3.32.2 Uncapped Memory Allocation via DRDYNVC DATA_FIRST
CVE-2026-121409	5.9 MEDIUM	FreeRDP before 3.32.2 Denial of Service via Oversized X.224 Routing Token
CVE-2026-121398	5.9 MEDIUM	FreeRDP before 3.32.2 Use-After-Free via dyn-channel-dump Module
CVE-2026-121408	5.3 MEDIUM	FreeRDP before 3.32.2 Use-After-Free via USB Redirection Control Channel
CVE-2026-121390	4.3 MEDIUM	FreeRDP before 3.32.2 Null Pointer Crash via ARM Gateway Response
CVE-2026-121396	4.3 MEDIUM	FreeRDP 3.0.0 before 3.32.2 denial of service via RTS padding assertion
CVE-2026-121391	4.3 MEDIUM	FreeRDP before 3.32.2 File Descriptor Exhaustion via Parallel CREATE
CVE-2026-121399	4.3 MEDIUM	FreeRDP before 3.32.2 Memory Exhaustion via RD Gateway Packet Length
CVE-2026-121410	4.3 MEDIUM	FreeRDP before 3.32.2 Denial of Service via RDPGFX ALPHA WIRETOSURFACE_2
CVE-2026-121397	4.3 MEDIUM	FreeRDP before 3.32.2 Heap Over-Read via WinPR save_png_to_buffer()
CVE-2026-121403	4.3 MEDIUM	FreeRDP before 3.32.2 Denial of Service via Malformed Drive IRP

Showing top 20 of 27 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: FreeRDP

Same vendor: FreeRDP

Same weakness: CWE-835