Codesys Runtime Toolkit

CODESYS Control Runtime: Remote Pointer Type Error DoS
CVE-2025-41738 7.5 - High - December 01, 2025

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.

Object Type Confusion

Remote OOB Read in CODESYS Control via Socket Race
CVE-2025-41739 5.9 - Medium - December 01, 2025

An unauthenticated remote attacker, who beats a race condition, can exploit a flaw in the communication servers of the CODESYS Control runtime system on Linux and QNX to trigger an out-of-bounds read via crafted socket communication, potentially causing a denial of service.

Out-of-bounds Read

Remote Command Injection in File System Libraries (CVE-2023-6357)
CVE-2023-6357 8.8 - High - December 05, 2023

A low-privileged remote attacker could exploit the vulnerability and inject additional system commands via file system libraries which could give the attacker full control of the device.

Shell injection

CODESYS v3 Remote File Access & DoS via Low-Privileged User
CVE-2022-4224 8.8 - High - March 23, 2023

In multiple products of CODESYS v3 in multiple versions a remote low privileged user could utilize this vulnerability to read and modify system files and OS resources or DoS the device.

Insecure Default Initialization of Resource

Multiple CODESYS products are affected to a buffer overflow.A low privileged remote attacker may craft a request
CVE-2022-32140 6.5 - Medium - June 24, 2022

Multiple CODESYS products are affected to a buffer overflow.A low privileged remote attacker may craft a request, which can cause a buffer copy without checking the size of the service, resulting in a denial-of-service condition. User Interaction is not required.

Classic Buffer Overflow

In the CODESYS Development System multiple components in multiple versions transmit the passwords for the communication between clients and servers unprotected.
CVE-2022-31805 7.5 - High - June 24, 2022

In the CODESYS Development System multiple components in multiple versions transmit the passwords for the communication between clients and servers unprotected.

Unprotected Transport of Credentials

In CODESYS V2 PLCWinNT and Runtime Toolkit 32 in versions prior to V2.4.7.57 password protection is not enabled by default and there is no information or prompt to enable password protection at login in case no password is set at the controller.
CVE-2022-31806 9.8 - Critical - June 24, 2022

In CODESYS V2 PLCWinNT and Runtime Toolkit 32 in versions prior to V2.4.7.57 password protection is not enabled by default and there is no information or prompt to enable password protection at login in case no password is set at the controller.

Insecure Default Initialization of Resource

Multiple products of CODESYS implement a improper error handling
CVE-2022-1965 8.1 - High - June 24, 2022

Multiple products of CODESYS implement a improper error handling. A low privilege remote attacker may craft a request, which is not properly processed by the error handling. In consequence, the file referenced by the request could be deleted. User interaction is not required.

Improper Handling of Exceptional Conditions

In multiple CODESYS products, a low privileged remote attacker may craft a request
CVE-2022-32136 6.5 - Medium - June 24, 2022

In multiple CODESYS products, a low privileged remote attacker may craft a request that cause a read access to an uninitialized pointer, resulting in a denial-of-service. User interaction is not required.

Access of Uninitialized Pointer

In multiple CODESYS products, a low privileged remote attacker may craft a request
CVE-2022-32137 8.8 - High - June 24, 2022

In multiple CODESYS products, a low privileged remote attacker may craft a request, which may cause a heap-based buffer overflow, resulting in a denial-of-service condition or memory overwrite. User interaction is not required.

Heap-based Buffer Overflow

In multiple CODESYS products, a remote attacker may craft a request
CVE-2022-32138 8.8 - High - June 24, 2022

In multiple CODESYS products, a remote attacker may craft a request which may cause an unexpected sign extension, resulting in a denial-of-service condition or memory overwrite.

Unexpected Sign Extension

In multiple CODESYS products, a low privileged remote attacker may craft a request
CVE-2022-32139 6.5 - Medium - June 24, 2022

In multiple CODESYS products, a low privileged remote attacker may craft a request, which cause an out-of-bounds read, resulting in a denial-of-service condition. User Interaction is not required.

Out-of-bounds Read

Multiple CODESYS Products are prone to a buffer over read
CVE-2022-32141 6.5 - Medium - June 24, 2022

Multiple CODESYS Products are prone to a buffer over read. A low privileged remote attacker may craft a request with an invalid offset, which can cause an internal buffer over-read, resulting in a denial-of-service condition. User interaction is not required.

Out-of-bounds Read

Multiple CODESYS Products are prone to a out-of bounds read or write access
CVE-2022-32142 8.1 - High - June 24, 2022

Multiple CODESYS Products are prone to a out-of bounds read or write access. A low privileged remote attacker may craft a request with invalid offset, which can cause an out-of-bounds read or write access, resulting in denial-of-service condition or local memory overwrite, which can lead to a change of local files. User interaction is not required.

Untrusted pointer offset

In multiple CODESYS products, file download and upload function allows access to internal files in the working directory e.g
CVE-2022-32143 8.8 - High - June 24, 2022

In multiple CODESYS products, file download and upload function allows access to internal files in the working directory e.g. firmware files of the PLC. All requests are processed on the controller only if no level 1 password is configured on the controller or if remote attacker has previously successfully authenticated himself to the controller. A successful Attack may lead to a denial of service, change of local files, or drain of confidential Information. User interaction is not required

Files or Directories Accessible to External Parties

In CODESYS V2 Runtime Toolkit 32 Bit full and PLCWinNT prior to versions V2.4.7.56 unauthenticated crafted invalid requests may result in several denial-of-service conditions
CVE-2021-34593 7.5 - High - October 26, 2021

In CODESYS V2 Runtime Toolkit 32 Bit full and PLCWinNT prior to versions V2.4.7.56 unauthenticated crafted invalid requests may result in several denial-of-service conditions. Running PLC programs may be stopped, memory may be leaked, or further communication clients may be blocked from accessing the PLC.

Improper Handling of Exceptional Conditions

A crafted request with invalid offsets may cause an out-of-bounds read or write access in CODESYS V2 Runtime Toolkit 32 Bit full and PLCWinNT prior to versions V2.4.7.56
CVE-2021-34595 8.1 - High - October 26, 2021

A crafted request with invalid offsets may cause an out-of-bounds read or write access in CODESYS V2 Runtime Toolkit 32 Bit full and PLCWinNT prior to versions V2.4.7.56, resulting in a denial-of-service condition or local memory overwrite.

Buffer Overflow

A crafted request may cause a read access to an uninitialized pointer in CODESYS V2 Runtime Toolkit 32 Bit full and PLCWinNT prior to versions V2.4.7.56
CVE-2021-34596 6.5 - Medium - October 26, 2021

A crafted request may cause a read access to an uninitialized pointer in CODESYS V2 Runtime Toolkit 32 Bit full and PLCWinNT prior to versions V2.4.7.56, resulting in a denial-of-service condition.

Access of Uninitialized Pointer

All versions of the CODESYS V3 Runtime Toolkit for VxWorks
CVE-2021-33486 7.5 - High - August 03, 2021

All versions of the CODESYS V3 Runtime Toolkit for VxWorks from version V3.5.8.0 and before version V3.5.17.10 have Improper Handling of Exceptional Conditions.

Improper Handling of Exceptional Conditions

CODESYS V2 runtime system SP before 2.4.7.55 has a Heap-based Buffer Overflow.
CVE-2021-30186 7.5 - High - May 25, 2021

CODESYS V2 runtime system SP before 2.4.7.55 has a Heap-based Buffer Overflow.

Memory Corruption

CODESYS V2 runtime system before 2.4.7.55 has Improper Input Validation.
CVE-2021-30195 7.5 - High - May 25, 2021

CODESYS V2 runtime system before 2.4.7.55 has Improper Input Validation.

Out-of-bounds Read

CODESYS V2 runtime system SP before 2.4.7.55 has Improper Neutralization of Special Elements used in an OS Command.
CVE-2021-30187 5.3 - Medium - May 25, 2021

CODESYS V2 runtime system SP before 2.4.7.55 has Improper Neutralization of Special Elements used in an OS Command.

Shell injection

3S-Smart CODESYS SP Realtime NT before V2.3.7.28, CODESYS Runtime Toolkit 32 bit full before V2.4.7.54, and CODESYS PLCWinNT before V2.4.7.54
CVE-2019-19789 - December 20, 2019

3S-Smart CODESYS SP Realtime NT before V2.3.7.28, CODESYS Runtime Toolkit 32 bit full before V2.4.7.54, and CODESYS PLCWinNT before V2.4.7.54 allow a NULL pointer dereference.

An issue was discovered in 3S-Smart CODESYS V3 products
CVE-2019-9013 - August 15, 2019

An issue was discovered in 3S-Smart CODESYS V3 products. The application may utilize non-TLS based encryption, which results in user credentials being insufficiently protected during transport. All variants of the following CODESYS V3 products in all versions containing the CmpUserMgr component are affected regardless of the CPU type or operating system: CODESYS Control for BeagleBone, CODESYS Control for emPC-A/iMX6, CODESYS Control for IOT2000, CODESYS Control for Linux, CODESYS Control for PFC100, CODESYS Control for PFC200, CODESYS Control for Raspberry Pi, CODESYS Control RTE V3, CODESYS Control RTE V3 (for Beckhoff CX), CODESYS Control Win V3 (also part of the CODESYS Development System setup), CODESYS V3 Simulation Runtime (part of the CODESYS Development System), CODESYS Control V3 Runtime System Toolkit, CODESYS HMI V3.