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CVE-2026-8047— Out-of-bounds Write in CODESYS Control

Quick assessment

Affected
CODESYS CODESYS Control RTE (SL)
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.

CODESYS Control等都是德国CODESYS公司的产品。CODESYS Control是一套工业控制程序编程软件。CODESYS是一个工业控制自动化软件。CODESYS HMI是一个可视化软件。 CODESYS多款产品存在安全漏洞，该漏洞源于解析传入HTTP请求时长度检查不当，导致大小有限的越界写入，可能导致未经身份验证的远程攻击者通过系统崩溃造成拒绝服务。以下产品受到影响：CODESYS Control RTE (SL)、CODESYS Control RTE (for Beckhoff CX

CVSS 7.5 · High EPSS 0.45% · P37

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 16

VendorProduct Version RangeStatus
CODESYS CODESYS Control for BeagleBone SL 4.15.0.0< 4.21.0.0 affected
CODESYS CODESYS Control for emPC-A/iMX6 SL 4.15.0.0< 4.21.0.0 affected
CODESYS CODESYS Control for IOT2000 SL 4.15.0.0< 4.21.0.0 affected
CODESYS CODESYS Control for Linux ARM SL 4.15.0.0< 4.21.0.0 affected
CODESYS CODESYS Control for Linux SL 4.15.0.0< 4.21.0.0 affected
CODESYS CODESYS Control for PFC100 SL 4.15.0.0< 4.21.0.0 affected
CODESYS CODESYS Control for PFC200 SL 4.15.0.0< 4.21.0.0 affected
CODESYS CODESYS Control for PLCnext SL 4.15.0.0< 4.21.0.0 affected
CODESYS CODESYS Control for Raspberry Pi SL 4.15.0.0< 4.21.0.0 affected
CODESYS CODESYS Control for WAGO Touch Panels 600 SL 0.0.0< 4.21.0.0 affected
CODESYS CODESYS Control RTE (for Beckhoff CX) SL 3.5.21.0< 3.5.22.20 affected
CODESYS CODESYS Control RTE (SL) 3.5.21.0< 3.5.22.20 affected
CODESYS CODESYS Control Win (SL) 3.5.21.0< 3.5.22.20 affected
CODESYS CODESYS HMI (SL) 3.5.21.0< 3.5.22.20 affected
CODESYS CODESYS Runtime Toolkit 3.5.21.0< 3.5.22.20 affected
CODESYS CODESYS Virtual Control SL 4.15.0.0< 4.21.0.0 affected
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I. Basic Information for CVE-2026-8047

Vulnerability Information
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Vulnerability Title
Out-of-bounds Write in CODESYS Control
Source: CVE Program / CVE List V5
Vulnerability Description
The affected products perform improper length checking when parsing incoming HTTP requests, resulting in a size-limited out-of-bounds write. An unauthenticated remote attacker can exploit this flaw to cause a denial of service via a system crash on the affected device.
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
CWE-1284
Source: CVE Program / CVE List V5
Vulnerability Title
CODESYS多款产品 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
CODESYS Control等都是德国CODESYS公司的产品。CODESYS Control是一套工业控制程序编程软件。CODESYS是一个工业控制自动化软件。CODESYS HMI是一个可视化软件。 CODESYS多款产品存在安全漏洞，该漏洞源于解析传入HTTP请求时长度检查不当，导致大小有限的越界写入，可能导致未经身份验证的远程攻击者通过系统崩溃造成拒绝服务。以下产品受到影响：CODESYS Control RTE (SL)、CODESYS Control RTE (for Beckhoff CX
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
CODESYS CODESYS Control RTE (SL) 3.5.21.0 ~ 3.5.22.20 -
CODESYS CODESYS Control RTE (for Beckhoff CX) SL 3.5.21.0 ~ 3.5.22.20 -
CODESYS CODESYS Control Win (SL) 3.5.21.0 ~ 3.5.22.20 -
CODESYS CODESYS HMI (SL) 3.5.21.0 ~ 3.5.22.20 -
CODESYS CODESYS Runtime Toolkit 3.5.21.0 ~ 3.5.22.20 -
CODESYS CODESYS Control for BeagleBone SL 4.15.0.0 ~ 4.21.0.0 -
CODESYS CODESYS Control for emPC-A/iMX6 SL 4.15.0.0 ~ 4.21.0.0 -
CODESYS CODESYS Control for IOT2000 SL 4.15.0.0 ~ 4.21.0.0 -
CODESYS CODESYS Control for Linux ARM SL 4.15.0.0 ~ 4.21.0.0 -
CODESYS CODESYS Control for Linux SL 4.15.0.0 ~ 4.21.0.0 -
CODESYS CODESYS Control for PFC100 SL 4.15.0.0 ~ 4.21.0.0 -
CODESYS CODESYS Control for PFC200 SL 4.15.0.0 ~ 4.21.0.0 -
CODESYS CODESYS Control for PLCnext SL 4.15.0.0 ~ 4.21.0.0 -
CODESYS CODESYS Control for Raspberry Pi SL 4.15.0.0 ~ 4.21.0.0 -
CODESYS CODESYS Control for WAGO Touch Panels 600 SL 0.0.0 ~ 4.21.0.0 -
CODESYS CODESYS Virtual Control SL 4.15.0.0 ~ 4.21.0.0 -

II. Public POCs for CVE-2026-8047

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-8047

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Vendor Advisories for CVE-2026-8047 (1)

Same Patch Batch · CODESYS · 2026-05-26 · 4 CVEs total

CVE-2026-8046 8.1 HIGH Incorrect Authorization in CODESYS Control
CVE-2026-44469 7.8 HIGH Incorrect Default Permissions in CODESYS Development System
CVE-2026-44468 7.8 HIGH Incorrect Default Permissions in CODESYS Development System

IV. Related Vulnerabilities

Same product: CODESYS Control RTE (SL)
Same vendor: CODESYS
Same weakness: CWE-1284

V. Comments for CVE-2026-8047

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