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CVE-2026-121407— FreeRDP before 3.32.2 Shadow Server Denial of Service via remdesk Channel

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 之前的版本在阴影服务器（shadow server）的 remdesk_server_thread 中存在一个拒绝服务漏洞。该漏洞允许已认证客户端通过反转的 PDU 长度检查导致进程崩溃。攻击者可发送一个 8192 字节的 remdesk 载荷，并声明其 PDU 长度为 8 字节，从而触发致命的 Stream_Seek 断言，导致服务器中止运行并中断所有会话。

CVSS 6.5 · Medium Updated Nov 03, 2026

Possible ATT&CK Techniques 1 AI

T1499.003 · Application Exhaustion Flood

Affected Version Matrix 2

Vendor	Product	Version Range	Status
FreeRDP	FreeRDP	`< 3.32.2`	affected
		`3.32.2`	unaffected

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Vulnerability Information

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Vulnerability Title

FreeRDP before 3.32.2 Shadow Server Denial of Service via remdesk Channel

Source: CVE Program / CVE List V5

Vulnerability Description

FreeRDP before 3.32.2 contains a denial of service vulnerability in the shadow server's remdesk_server_thread that allows authenticated clients to crash the process via an inverted PDU length check. Attackers can send an 8192-byte remdesk payload declaring an eight-byte PDU length to trigger a fatal Stream_Seek assertion, aborting the server and dropping sessions.

Source: CVE Program / CVE List V5

CVSS Information

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

Source: CVE Program / CVE List V5

Vulnerability Type

输入验证不恰当

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-2026-121407

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-121407

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Other References for CVE-2026-121407 (2)

https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-x8vp-ff7m-294g vendor-advisory
https://www.vulncheck.com/advisories/freerdp-before-3.32.2-shadow-server-denial-of-service-via-remdesk-channel third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-121407

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-2026-121400	6.5 MEDIUM	FreeRDP before 3.32.2 CPU Exhaustion via RDG Control Packet
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-2026-121393	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-2026-121410	4.3 MEDIUM	FreeRDP before 3.32.2 Denial of Service via RDPGFX ALPHA WIRETOSURFACE_2
CVE-2026-121399	4.3 MEDIUM	FreeRDP before 3.32.2 Memory Exhaustion via RD Gateway Packet Length
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-20