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

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-33592— FindServers Memory Exhaustion in open62541

Quick assessment

Affected
open62541 project / o6 Automation GmbH open62541
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.

Open62541是Open62541团队开源的一个 OPC UA(OPC统一架构)的开源实现。 open62541存在资源管理错误漏洞，该漏洞源于未验证FindServersRequest中serverUris字段的长度或数组大小，攻击者可声明超大字符串并跨中间块传递而不发送最终块，服务器会无限期缓冲RAM中的所有块直到SecureChannel超时，可能导致未经身份验证的远程攻击者耗尽服务器内存。以下版本受到影响：1.4.0版本及之前的1.4.x版本、1.5.0版本及之前的1.5.x版本和master

CVSS 7.5 · High EPSS 0.52% · P43

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 3

VendorProduct Version RangeStatus
open62541 project / o6 Automation GmbH open62541 1.4.0≤ 1.4.16 affected
1.5.0≤ 1.5.4 affected
master affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-33592

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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.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
FindServers Memory Exhaustion in open62541
Source: CVE Program / CVE List V5
Vulnerability Description
An unauthenticated remote attacker can exhaust server memory via the FindServers Discovery Service in open62541. The serverUris field of FindServersRequest is not validated for length or array size. An attacker can declare an arbitrarily large string (up to ~3.9 GB) delivered across intermediate chunks without ever sending the final chunk. The server buffers all chunks in RAM indefinitely until the SecureChannel times out. The attack is pre-session and bypasses all encryption configuration. The issue affects open62541: from 1.4.0 through 1.4.16, from 1.5.0 through 1.5.4, master.
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
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
open62541 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Open62541是Open62541团队开源的一个 OPC UA(OPC统一架构)的开源实现。 open62541存在资源管理错误漏洞，该漏洞源于未验证FindServersRequest中serverUris字段的长度或数组大小，攻击者可声明超大字符串并跨中间块传递而不发送最终块，服务器会无限期缓冲RAM中的所有块直到SecureChannel超时，可能导致未经身份验证的远程攻击者耗尽服务器内存。以下版本受到影响：1.4.0版本及之前的1.4.x版本、1.5.0版本及之前的1.5.x版本和master
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
open62541 project / o6 Automation GmbH open62541 1.4.0 ~ 1.4.16 -

II. Public POCs for CVE-2026-33592

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8034 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-2026-33592

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-33592 (2)

IV. Related Vulnerabilities

Same product: open62541
Same vendor: open62541 project / o6 Automation GmbH
Same weakness: CWE-770

V. Comments for CVE-2026-33592

No comments yet

Leave a comment