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Vulnerability Assessment

Weakness
CWE
CWE-843
OWASP Top 10:2025
A06:2021 - Vulnerable and Outdated Components
ASVS 5.0
V15 - Secure Coding and Architecture Type safety enforcement
MITRE ATT&CK

1 technique across 1 tactic: Execution

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

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Impact

Service disruption affecting availability. In critical infrastructure, DoS can have cascading effects on dependent systems. With a CVSS score of 7.5 (HIGH), this represents a significant risk.
Exploit ScenarioDerived

An attacker sends specially crafted requests that cause excessive resource consumption (CPU, memory, disk) or trigger a crash in the target application.
This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).
Patch available 0.1% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 15, 2026

An unauthenticated remote attacker may cause the visualisation server of the CODESYS Control runtime system to access a resource with a pointer of wrong type, potentially leading to a denial-of-service (DoS) condition.

Earlier versions of this analysis (1)
v1 Mar 15, 2026 - 13:34 CVSS 7.5

RemediationAI

Implement rate limiting and input validation. Use timeout mechanisms for resource-intensive operations. Deploy DDoS protection where applicable.

Affected VersionsENISA

CODESYS HMI (SL) 3.5.18.0 <3.5.21.40
CODESYS Control for PLCnext SL 4.5.0.0 <4.19.0.0
CODESYS Control for IOT2000 SL 4.5.0.0 <4.19.0.0
CODESYS Control for Linux ARM SL 4.5.0.0 <4.19.0.0
CODESYS Control for WAGO Touch Panels 600 SL 4.5.0.0 <4.19.0.0
CODESYS Control Win (SL) 3.5.18.0 <3.5.21.40
CODESYS Control for Raspberry Pi SL 4.5.0.0 <4.19.0.0
CODESYS Runtime Toolkit 3.5.18.0 <3.5.21.40
CODESYS Control RTE (for Beckhoff CX) SL 3.5.18.0 <3.5.21.40
CODESYS Control RTE (SL) 3.5.18.0 <3.5.21.40
CODESYS Control for PFC100 SL 4.5.0.0 <4.19.0.0
CODESYS Virtual Control SL 4.5.0.0 <4.19.0.0
CODESYS Control for Linux SL 4.5.0.0 <4.19.0.0
CODESYS Control for emPC-A/iMX6 SL 4.5.0.0 <4.19.0.0
CODESYS Control for PFC200 SL 4.5.0.0 <4.19.0.0
CODESYS Control for BeagleBone SL 4.5.0.0 <4.19.0.0
CODESYS Remote Target Visu 3.5.18.0 <3.5.21.40

Affected Packages

euvd codesys_control_for_beaglebone_sl fix: 4.19.0.0
euvd codesys_control_for_empc_a_imx6_sl fix: 4.19.0.0
euvd codesys_control_for_iot2000_sl fix: 4.19.0.0
euvd codesys_control_for_linux_arm_sl fix: 4.19.0.0
euvd codesys_control_for_linux_sl fix: 4.19.0.0
euvd codesys_control_for_pfc100_sl fix: 4.19.0.0
euvd codesys_control_for_pfc200_sl fix: 4.19.0.0
euvd codesys_control_for_plcnext_sl fix: 4.19.0.0
euvd codesys_control_for_raspberry_pi_sl fix: 4.19.0.0
euvd codesys_control_for_wago_touch_panels_600_sl fix: 4.19.0.0
euvd codesys_control_rte_for_beckhoff_cx_sl fix: 3.5.21.40
euvd codesys_control_rte_sl fix: 3.5.21.40
euvd codesys_control_win_sl fix: 3.5.21.40
euvd codesys_hmi_sl fix: 3.5.21.40
euvd codesys_remote_target_visu fix: 3.5.21.40
euvd codesys_runtime_toolkit fix: 3.5.21.40
euvd codesys_virtual_control_sl fix: 4.19.0.0

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 17 packages in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

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Technical ContextAI · show details

A denial of service vulnerability allows an attacker to disrupt the normal functioning of a system, making it unavailable to legitimate users. This vulnerability is classified as Access of Resource Using Incompatible Type (Type Confusion) (CWE-843).

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  • Exploit and PoC references, threat intelligence from 22 sources
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Severity by source

NVD PRIMARY 7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

3
Analysis Updated
Apr 16, 2026 - 06:25 EUVD-patch-fix
executive summary
Patch available
Apr 16, 2026 - 05:29 EUVD
3.5.21.40,4.19.0.0
CVE Published
Dec 01, 2025 - 10:16 nvd
HIGH 7.5

Executive ViewAI

Why It Matters

CVE-2025-41738 affects CODESYS Control runtime systems, allowing unauthenticated remote attackers to trigger denial-of-service conditions against the visualization server. Organizations deploying CODESYS for industrial control or automation face potential service unavailability without network segmentation or access controls, impacting operational continuity.

Business Impact: High
Compensating Controls

Apply vendor patch. If immediate patching is not feasible: restrict network access to the CODESYS visualization server to authorized systems only using firewall rules; implement network segmentation to prevent unauthenticated external access; monitor for abnormal connection attempts to visualization server ports.

Threat Intelligence Overview

EPSS Score
0.1%
Top 69% exploitable
Data Quality
4 sources
Confidence: Medium
EUVD NVD CVE.org EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity HIGH
CISA KEV No
Public POC No
EPSS 0.1%
Patch available Yes
Active threat No
Deciding rule
HIGH severity (CVSS 7.0-8.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
Yes
Human Impact
High

Priority Score

38
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +38
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Memory Corruption HIGH

Memory corruption occurs when a program writes data beyond the boundaries of allocated memory regions or accesses memory in unintended ways, violating the integrity of the process's address space.

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.

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Same weakness CWE-843 – Access of Resource Using Incompatible Type (Type Confusion)

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References

Advisories & patches
ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2025-41738 REF https://certvde.com/de/advisories/VDE-2025-100

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