Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%

Buy Us a Coffee

CVE-2026-121406— FreeRDP before 3.32.2 Client Denial of Service via Zero-Output ZGFX Payload

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 FreeRDP 3.32.2 之前的版本中，存在一个导致客户端断言中止的漏洞。该漏洞源于函数仅拒绝负值的状态码，却将由此产生的空输出指针传递给了。攻击者可利用此漏洞，在会话激活后，通过 RDPGFX 通道向客户端发送零输出大小的 ZGFX 负载，从而强制终止客户端。

CVSS 4.3 · Medium Updated Nov 03, 2026

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

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

Get alerts for future matching vulnerabilities Log in to subscribe

Vulnerability Information

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

View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title

FreeRDP before 3.32.2 Client Denial of Service via Zero-Output ZGFX Payload

Source: CVE Program / CVE List V5

Vulnerability Description

FreeRDP before 3.32.2 allows a client assertion abort because rdpgfx_on_data_received rejects only negative zgfx_decompress status and passes the resulting null output pointer to Stream_StaticConstInit. A malicious RDP server can send a zero-output ZGFX payload on the RDPGFX channel after session activation to terminate the client.

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:L

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-2026-121406

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-121406

请登录查看更多情报信息。

Other References for CVE-2026-121406 (2)

https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-2c9x-4gr7-hrwx vendor-advisory
https://www.vulncheck.com/advisories/freerdp-before-3.32.2-client-denial-of-service-via-zero-output-zgfx-payload third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-121406

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-2026-121409	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-2026-121401	4.3 MEDIUM	FreeRDP before 3.32.2 Denial of Service via RD Gateway extended-auth packet
CVE-2026-121405	4.3 MEDIUM	FreeRDP before 3.32.2 Memory Exhaustion via Serial RDPDR Device Control
CVE-2026-121403	4.3 MEDIUM	FreeRDP before 3.32.2 Denial of Service via Malformed Drive IRP
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