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CVE-2026-67300— FreeRDP before 3.29.0 Use-After-Free via async message proxy

Quick assessment

Affected
FreeRDP FreeRDP
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

FreeRDP是FreeRDP团队开源的一款远程桌面协议(RDP)的实现。 FreeRDP 3.29.0之前版本存在安全漏洞，该漏洞源于异步更新消息代理在启用AsyncUpdate时对RAIL WINDOW_STATE_ORDER和NOTIFY_ICON_STATE_ORDER的处理存在客户端堆释放后重用问题，当恶意或受损的RDP服务器发送特制更新订单时，可能导致内存损坏或客户端崩溃。

CVSS 7.5 · High EPSS 0.59% · P47

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
FreeRDP FreeRDP < 3.29.0 affected
3.29.0 unaffected
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I. Basic Information for CVE-2026-67300

Vulnerability Information
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Vulnerability Title
FreeRDP before 3.29.0 Use-After-Free via async message proxy
Source: CVE Program / CVE List V5
Vulnerability Description
FreeRDP before 3.29.0 contains client-side heap use-after-free vulnerabilities in the async update message proxy for RAIL WINDOW_STATE_ORDER and NOTIFY_ICON_STATE_ORDER when AsyncUpdate is enabled. When a malicious or compromised RDP server sends crafted update orders, the message proxy shallow-copies structures containing nested parser-owned pointers (e.g., titleInfo.string, windowRects, visibilityRects, icon buffers). The parser frees those nested buffers after the callback returns, so the queued async message later dispatches stale pointers, potentially causing memory corruption or a client crash.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5
Vulnerability Title
FreeRDP 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FreeRDP是FreeRDP团队开源的一款远程桌面协议(RDP)的实现。 FreeRDP 3.29.0之前版本存在安全漏洞，该漏洞源于异步更新消息代理在启用AsyncUpdate时对RAIL WINDOW_STATE_ORDER和NOTIFY_ICON_STATE_ORDER的处理存在客户端堆释放后重用问题，当恶意或受损的RDP服务器发送特制更新订单时，可能导致内存损坏或客户端崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
FreeRDP FreeRDP 0 ~ 3.29.0 -

II. Public POCs for CVE-2026-67300

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 9530 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-67300

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Patches & Fixes for CVE-2026-67300 (1)

Vendor Advisories for CVE-2026-67300 (2)

Same Patch Batch · FreeRDP · 2026-08-01 · 21 CVEs total

CVE-2026-66402 9.8 CRITICAL FreeRDP before 3.29.0 TLS Certificate Identity Validation Bypass
CVE-2026-67289 9.8 CRITICAL FreeRDP before 3.29.0 HTTP Proxy Request Injection via Redirection
CVE-2026-67305 9.4 CRITICAL FreeRDP Windows Client before 3.29.0 Heap Buffer Overflow via Cliprdr
CVE-2026-67291 7.5 HIGH FreeRDP before 3.29.0 Heap Out-of-Bounds Read via GLYPH_FRAGMENT_ADD
CVE-2026-67304 7.5 HIGH FreeRDP before 3.29.0 NULL Dereference via smartcard cleanup
CVE-2026-67297 7.5 HIGH FreeRDP before 3.29.0 Resource Exhaustion via chunked HTTP response
CVE-2026-67301 7.5 HIGH FreeRDP before 3.29.0 Out-of-bounds Read via Polygon async message-proxy
CVE-2026-67290 7.5 HIGH FreeRDP before 3.29.0 Heap Out-of-Bounds Read via TSMF
CVE-2026-67296 7.5 HIGH FreeRDP before 3.29.0 Denial of Service via RDPEI PDU
CVE-2026-67299 7.5 HIGH FreeRDP before 3.29.0 Use-After-Free via WindowIcon async message
CVE-2026-67288 7.5 HIGH FreeRDP before 3.29.0 Denial of Service via smartcard cache
CVE-2026-67298 7.5 HIGH FreeRDP 3.28.0 Heap Buffer Overflow via RAIL orderLength Underflow
CVE-2026-67292 6.5 MEDIUM FreeRDP before 3.29.0 WebSocket Ping Buffer Over-disclosure
CVE-2026-67295 6.3 MEDIUM FreeRDP before 3.29.0 Path Traversal via drive redirection
CVE-2026-67294 5.9 MEDIUM FreeRDP before 3.29.0 TLS Certificate EKU Bypass
CVE-2026-67306 5.4 MEDIUM FreeRDP before 3.29.0 Out-of-Bounds Read via Planar RLE
CVE-2026-67303 4.3 MEDIUM FreeRDP before 3.29.0 Denial of Service via serial DeviceControl
CVE-2026-67302 4.3 MEDIUM FreeRDP rdpecam StartStreamsRequest divide-by-zero denial of service
CVE-2026-67293 4.2 MEDIUM FreeRDP before 3.29.0 Improper Certificate Hostname Validation
CVE-2026-66401 2.1 LOW FreeRDP before 3.29.0 Out-of-Bounds Read via UVC H.264

IV. Related Vulnerabilities

Same product: FreeRDP
Same vendor: FreeRDP
Same weakness: CWE-416

V. Comments for CVE-2026-67300

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