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CVE-2026-111373— FreeRDP before 3.32.0 NULL Dereference via Zero-Length WebSocket Ping

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 3.32.0 版本之前，websocket 传输层中存在一个空指针解引用漏洞。恶意网关可以通过发送零长度的 ping 消息导致客户端崩溃。当负载长度为零时，websocket_reply_pong 函数会将一个 nullptr 流传递给 websocket_reply_close 函数，从而触发断言失败，导致客户端进程终止并引发拒绝服务（DoS）攻击。

CVSS 5.3 · Medium

Possible ATT&CK Techniques 1 AI

T1499.002 · Service Exhaustion Flood
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I. Basic Information for CVE-2026-111373

Vulnerability Information
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Vulnerability Title
FreeRDP before 3.32.0 NULL Dereference via Zero-Length WebSocket Ping
Source: CVE Program / CVE List V5
Vulnerability Description
FreeRDP before 3.32.0 contains a NULL pointer dereference vulnerability in the websocket transport that allows a malicious gateway to crash clients by sending zero-length pings. When the payload length is zero, websocket_reply_pong passes a nullptr stream to websocket_reply_close, triggering an assertion failure that terminates the client process and causes denial of service.
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:L
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
FreeRDP FreeRDP 0 ~ 3.32.0 -

II. Public POCs for CVE-2026-111373

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III. Intelligence Information for CVE-2026-111373

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Vendor Advisories for CVE-2026-111373 (2)

Same Patch Batch · FreeRDP · 2026-10-16 · 10 CVEs total

CVE-2026-111382 8.8 HIGH FreeRDP before 3.32.0 Heap Out-of-Bounds Write in AVC444 YUV444 Combine
CVE-2026-111380 8.8 HIGH FreeRDP 3.29.0 before 3.32.0 Heap Overflow via audin Apple Backends
CVE-2026-111378 7.5 HIGH FreeRDP 3.0.0 before 3.32.0 Unauthenticated Memory Exhaustion via NLA Frame Parser
CVE-2026-111381 7.3 HIGH FreeRDP before 3.32.0 Heap Buffer Overflow via Persistent Cache v2 Parser
CVE-2026-111379 7.3 HIGH FreeRDP before 3.32.0 Heap Buffer Overflow via persistent_cache_read_entry_v3
CVE-2026-111377 6.5 MEDIUM FreeRDP 2.0.0 before 3.32.0 Memory Exhaustion via Static Channel Reassembly
CVE-2026-111374 5.3 MEDIUM FreeRDP from 3.30.0 before 3.32.0 Resource Exhaustion via rdpecam StartStreamsRequest
CVE-2026-111376 5.0 MEDIUM FreeRDP 3.30.0 before 3.32.0 Heap Over-Read via Windows cliprdr FILECONTENTS_SIZE
CVE-2026-111375 4.8 MEDIUM FreeRDP 3.0.0 before 3.32.0 Out-of-Bounds Read via RAIL Window Title

IV. Related Vulnerabilities

Same product: FreeRDP
Same vendor: FreeRDP
Same weakness: CWE-476

V. Comments for CVE-2026-111373

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