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CVE-2026-121409— FreeRDP before 3.32.2 Denial of Service via Oversized X.224 Routing Token

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.

在 3.32.2 之前的 FreeRDP 版本中存在一个拒绝服务漏洞。该漏洞允许恶意服务器或未认证的通信对等方通过发送过大的 X.224 路由令牌，强制终止客户端或代理进程。攻击者可以在服务器重定向 PDU（协议数据单元）中发送过大的 LoadBalanceInfo，或向 FixedTarget 类型的 freerdp-proxy 发送长度为 240 至 247 字节的令牌，从而触发断言失败，导致进程崩溃。

CVSS 5.9 · Medium Updated Nov 04, 2026

Possible ATT&CK Techniques 1 AI

T1499.003 · Application Exhaustion Flood

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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 Denial of Service via Oversized X.224 Routing Token

Source: CVE Program / CVE List V5

Vulnerability Description

FreeRDP before 3.32.2 contains a denial of service vulnerability that allows malicious servers or unauthenticated peers to abort clients or proxies via oversized X.224 routing tokens. Attackers can send an oversized LoadBalanceInfo in a Server Redirection PDU, or a 240–247 byte token to a FixedTarget freerdp-proxy, triggering a tpdu_write_header assertion that crashes the process.

Source: CVE Program / CVE List V5

CVSS Information

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

Source: CVE Program / CVE List V5

Vulnerability Type

可达断言

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-2026-121409

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-121409

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Other References for CVE-2026-121409 (2)

https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-3hf9-w6hr-hf9j vendor-advisory
https://www.vulncheck.com/advisories/freerdp-before-3.32.2-denial-of-service-via-oversized-x-224-routing-token third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-121409

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-2026-121407	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-2026-121398	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-2026-121401	4.3 MEDIUM	FreeRDP before 3.32.2 Denial of Service via RD Gateway extended-auth packet
CVE-2026-121403	4.3 MEDIUM	FreeRDP before 3.32.2 Denial of Service via Malformed Drive IRP
CVE-2026-121405	4.3 MEDIUM	FreeRDP before 3.32.2 Memory Exhaustion via Serial RDPDR Device Control
CVE-2026-121406	4.3 MEDIUM	FreeRDP before 3.32.2 Client Denial of Service via Zero-Output ZGFX Payload
CVE-2026-121387	4.3 MEDIUM	FreeRDP 2.0.0 before 3.32.2 Out-of-Bounds Read via GSM610/WAV49 Decoder
CVE-2026-121390	4.3 MEDIUM	FreeRDP before 3.32.2 Null Pointer Crash via ARM Gateway Response
CVE-2026-121397	4.3 MEDIUM	FreeRDP before 3.32.2 Heap Over-Read via WinPR save_png_to_buffer()

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

IV. Related Vulnerabilities

Same product: FreeRDP

Same vendor: FreeRDP

Same weakness: CWE-617