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CVE-2026-121395— FreeRDP 3.17.0 before 3.32.2 Denial of Service via RemoteFX Decoder

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 在 3.17.0 至 3.32.2（不含）版本中存在一个断言失败漏洞，该问题出现在启用详细 WinPR 断言时的 RemoteFX 差分解码器中。恶意 RDP 服务器可发送一个特制的 RemoteFX 图块，其中相邻的 LL3 系数之和超出有符号 16 位整数的表示范围，从而导致客户端进程异常终止。

CVSS 6.5 · Medium Updated Nov 03, 2026

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

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Vulnerability Information

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Vulnerability Title

FreeRDP 3.17.0 before 3.32.2 Denial of Service via RemoteFX Decoder

Source: CVE Program / CVE List V5

Vulnerability Description

FreeRDP from 3.17.0 before 3.32.2 contains an assertion failure in the RemoteFX differential decoder when verbose WinPR assertions are enabled. A malicious RDP server can send a crafted RemoteFX tile with adjacent LL3 coefficients summing beyond signed 16-bit range to abort the client process.

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

可达断言

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
FreeRDP	FreeRDP	3.17.0 ~ 3.32.2	-

II. Public POCs for CVE-2026-121395

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-121395

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Other References for CVE-2026-121395 (2)

https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-cg4f-57hc-v7w7 vendor-advisory
https://www.vulncheck.com/advisories/freerdp-3.17.0-before-3.32.2-denial-of-service-via-remotefx-decoder third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-121395

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-2026-121400	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-2026-121388	6.5 MEDIUM	FreeRDP 3.0.0 before 3.32.2 Uncapped Memory Allocation via DRDYNVC DATA_FIRST
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-2026-121394	6.5 MEDIUM	FreeRDP before 3.32.2 Denial of Service via RemoteFX RLGR decoder
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-2026-121398	5.9 MEDIUM	FreeRDP before 3.32.2 Use-After-Free via dyn-channel-dump Module
CVE-2026-121409	5.9 MEDIUM	FreeRDP before 3.32.2 Denial of Service via Oversized X.224 Routing Token
CVE-2026-121408	5.3 MEDIUM	FreeRDP before 3.32.2 Use-After-Free via USB Redirection Control Channel
CVE-2026-121405	4.3 MEDIUM	FreeRDP before 3.32.2 Memory Exhaustion via Serial RDPDR Device Control
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-2026-121387	4.3 MEDIUM	FreeRDP 2.0.0 before 3.32.2 Out-of-Bounds Read via GSM610/WAV49 Decoder
CVE-2026-121396	4.3 MEDIUM	FreeRDP 3.0.0 before 3.32.2 denial of service via RTS padding assertion
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

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

IV. Related Vulnerabilities

Same product: FreeRDP

Same vendor: FreeRDP

Same weakness: CWE-617