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CVE-2026-33516— xrdp: Pre-authentication out-of-bounds reads in RDP capability and channel parsers

Quick assessment

Affected
neutrinolabs xrdp
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.

xrdp是neutrinolabs开源的一款开源远程桌面协议服务器。 xrdp 0.10.5及之前版本存在安全漏洞，该漏洞源于RDP能力交换阶段存在越界读取，可能导致拒绝服务或泄露进程内存中的敏感信息。

AI Predicted 7.5 Difficulty: Easy EPSS 0.68% · P51

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-33516

Vulnerability Information
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Vulnerability Title
xrdp: Pre-authentication out-of-bounds reads in RDP capability and channel parsers
Source: CVE Program / CVE List V5
Vulnerability Description
xrdp is an open source RDP server. Versions through 0.10.5 contain an out-of-bounds read vulnerability during the RDP capability exchange phase. The issue occurs when memory is accessed before validating the remaining buffer length. A remote, unauthenticated attacker can trigger this vulnerability by sending a specially crafted Confirm Active PDU. Successful exploitation could lead to a denial of service (process crash) or potential disclosure of sensitive information from the process memory. This issue has been fixed in version 0.10.6.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
xrdp 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
xrdp是neutrinolabs开源的一款开源远程桌面协议服务器。 xrdp 0.10.5及之前版本存在安全漏洞，该漏洞源于RDP能力交换阶段存在越界读取，可能导致拒绝服务或泄露进程内存中的敏感信息。
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
neutrinolabs xrdp < 0.10.6 -

II. Public POCs for CVE-2026-33516

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III. Intelligence Information for CVE-2026-33516

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Vendor Pages for CVE-2026-33516 (1)

Same Patch Batch · neutrinolabs · 2026-04-17 · 8 CVEs total

CVE-2026-32107 8.8 HIGH xrdp: Fail-open privilege drop in sesexec — child processes may execute as root if setuid
CVE-2026-33145 6.3 MEDIUM xrdp: Authenticated RCE via unsanitized AlternateShell execution in xrdp-sesman
CVE-2026-35512 xrdp: Heap buffer overflow in EGFX channel
CVE-2026-32105 xrdp: RDP MAC signature (dataSignature) never verified on receive — integrity bypass in no
CVE-2026-32624 xrdp: Heap buffer overflow in xrdp_sec_process_logon_info() via incorrect g_strncat length
CVE-2026-32623 xrdp: Heap buffer overflow in NeutrinoRDP channel reassembly
CVE-2026-33689 xrdp: Pre-authentication out-of-bounds reads in channel parsers

IV. Related Vulnerabilities

Same product: xrdp
Same vendor: neutrinolabs
Same weakness: CWE-125

V. Comments for CVE-2026-33516

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