Codesys vulnerabilities
We track 50 vulnerabilities in Codesys products across 60+ products. 50 are rated high or critical, and none are known to be exploited. The most recent was published on September 30, 2026.
Latest Codesys vulnerabilities
- 7.5 High severity
Development System 3: Allocation of Resources Without Limits or Throttling
The CODESYS Gateway Client allocates memory based on a size field in a gateway response without enforcing an appropriate upper limit. An unauthenticated remote attacker controlling a malicious gateway can exploit this behavior to trigger excessive memory consu
- 8.1 High severity
Control RTE (SL): Concurrent Execution using Shared Resource with Improper Synchronization
Affected products do not properly synchronize access to their monitoring functionality. When multiple clients send concurrent requests, this may lead to incorrect reads or writes, or to corruption of internal memory structures. An authenticated remote attacker
- 7.5 High severity
CODESYS Control RTE (SL): Improper Validation of Specified Quantity in Input
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 affecte
- 8.1 High severity
CODESYS Control RTE (SL): Incorrect Authorization
The affected products insufficiently verify authorization when deleting user accounts. An authenticated, low-privileged remote user can exploit this vulnerability to delete other users, including those with higher privileges.
- 7.0 High severity
CODESYS Development System: Incorrect Default Permissions
The affected product extracts installation files to a temporary directory with incorrect default permissions during administrative installation. A low-privileged local attacker can exploit a TOCTOU race condition with a practical time window to replace verifie
- 7.8 High severity
CODESYS Development System: Incorrect Default Permissions
The affected product creates a directory with insecure default permissions during administrative installation. This allows a low-privileged local attacker to modify a temporary file defining the components to be installed, enabling local privilege escalation b
- 8.2 High severity
CODESYS Modbus: Missing Release of Resource after Effective Lifetime
An unauthenticated remote attacker may exhaust all available TCP connections in the CODESYS Modbus TCP Server stack if a race condition in connection handling is successfully exploited, preventing legitimate clients from establishing new connections.
- 8.7 High severity
CODESYS EtherNetIP: Improper Check for Unusual or Exceptional Conditions
An unauthenticated remote attacker is able to exhaust all available TCP connections in the CODESYS EtherNet/IP adapter stack, preventing legitimate clients from establishing new connections.
- 7.5 High severity
CODESYS Control RTE (SL): Use of Externally-Controlled Format String
An unauthenticated remote attacker may be able to control the format string of messages processed by the Audit Log of the CODESYS Control runtime system, potentially resulting in a denial‑of‑service (DoS) condition.
- 8.8 High severity
CODESYS Control RTE (SL): Incorrect Resource Transfer Between Spheres
A low-privileged remote attacker may be able to replace the boot application of the CODESYS Control runtime system, enabling unauthorized code execution.
- 7.3 High severity
CODESYS Installer: Time-of-check Time-of-use (TOCTOU) Race Condition
If a legitimate user confirms a self-update prompt or initiate an installation of a CODESYS Development System, a low privileged local attacker can gain elevated rights due to a TOCTOU vulnerability in the CODESYS installer.
- 7.5 High severity
CODESYS Control RTE (SL): Access of Resource Using Incompatible Type
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.
- 7.8 High severity
CODESYS Development System: Deserialization of Untrusted Data
An unauthenticated attacker can trick a local user into executing arbitrary code by opening a deliberately manipulated CODESYS project file with a CODESYS development system. This arbitrary code is executed in the user context.
- 7.5 High severity
Control RTE (SL): NULL Pointer Dereference
An unauthenticated remote attacker may trigger a NULL pointer dereference in the affected CODESYS Control runtime systems by sending specially crafted communication requests, potentially leading to a denial-of-service (DoS) condition.
- 8.3 High severity
Control RTE (SL): Incorrect Permission Assignment for Critical Resource
A low-privileged attacker can remotely access the PKI folder of the CODESYS Control runtime system and thus read and write certificates and its keys. This allows sensitive data to be extracted or to accept certificates as trusted. Although all services remain
- 7.5 High severity
CODESYS Runtime Toolkit: Observable Discrepancy
An unauthenticated remote attacker can gain access to sensitive information including authentication information when using CODESYS OPC UA Server with the non-default Basic128Rsa15 security policy.
- 7.5 High severity
CODESYS Control for BeagleBone SL: Incorrect Calculation of Buffer Size
An unauthenticated remote attacker can use a malicious OPC UA client to send a crafted request to affected CODESYS products which can cause a DoS due to incorrect calculation of buffer size.
- 7.8 High severity
CODESYS Control Win (SL): Exposure of Resource to Wrong Sphere
A local attacker with low privileges can read and modify any users files and cause a DoS in the working directory of the affected products due to exposure of resource to wrong sphere.
- 7.8 High severity
CODESYS Development System V2.3: Out-of-bounds Write
An unauthenticated local attacker may trick a user to open corrupted project files to execute arbitrary code or crash the system due to an out-of-bounds write vulnerability.
- 8.8 High severity
CODESYS Control for BeagleBone SL: Improper Neutralization of Special Elements used in an OS Command
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.
- 8.8 High severity
CODESYS Control for BeagleBone SL: Improper Restriction of Operations within the Bounds of a Memory Buffer
In CODESYS Control in multiple versions a improper restriction of operations within the bounds of a memory buffer allow an remote attacker with user privileges to gain full access of the device.
- 8.8 High severity
CODESYS Development System: Improper Verification of Source of a Communication Channel
In CODESYS Development System versions from 3.5.11.20 and before 3.5.19.20 a missing integrity check might allow an unauthenticated remote attacker to manipulate the content of notifications received via HTTP by the CODESYS notification server.
- 7.3 High severity
CODESYS Development System: Uncontrolled Search Path Element
In CODESYS Development System versions from 3.5.17.0 and prior to 3.5.19.20 a vulnerability allows for execution of binaries from the current working directory in the users context .
- 7.3 High severity
CODESYS Development System: Exposure of Resource to Wrong Sphere
In CODESYS Development System 3.5.9.0 to 3.5.17.0 and CODESYS Scripting 4.0.0.0 to 4.1.0.0 unsafe directory permissions would allow an attacker with local access to the workstation to place potentially harmful and disguised scripts that could be executed by le
- 7.7 High severity
CODESYS Development System V3: Inadequate Encryption Strength
Inadequate Encryption Strength in CODESYS Development System V3 versions prior to V3.5.18.40 allows an unauthenticated local attacker to access and manipulate code of the encrypted boot application.
- 7.5 High severity
In multiple CODESYS products in multiple versions an unauthorized, remote attacker may use a…
In multiple CODESYS products in multiple versions an unauthorized, remote attacker may use a improper input validation vulnerability to read from invalid addresses leading to a denial of service.
- 8.8 High severity
CODESYS Control RTE (SL): Out-of-bounds Write
An authenticated, remote attacker may use a stack based out-of-bounds write vulnerability in the CmpTraceMgr Component of multiple CODESYS products in multiple versions to write data into the stack which can lead to a denial-of-service condition, memory overwr
- 8.8 High severity
CODESYS Control RTE (SL): Out-of-bounds Write
An authenticated, remote attacker may use a stack based out-of-bounds write vulnerability in the CmpTraceMgr Component of multiple CODESYS products in multiple versions to write data into the stack which can lead to a denial-of-service condition, memory overwr
- 8.8 High severity
CODESYS Control RTE (SL): Out-of-bounds Write
An authenticated, remote attacker may use a stack based out-of-bounds write vulnerability in the CmpTraceMgr Component of multiple CODESYS products in multiple versions to write data into the stack which can lead to a denial-of-service condition, memory overwr
- 8.8 High severity
CODESYS Control RTE (SL): Out-of-bounds Write
An authenticated remote attacker may use a stack based out-of-bounds write vulnerability in the CmpTraceMgr Component of multiple CODESYS products in multiple versions to write data into the stack which can lead to a denial-of-service condition, memory overwri
- 8.8 High severity
CODESYS Control RTE (SL): Out-of-bounds Write
An authenticated, remote attacker may use a stack based out-of-bounds write vulnerability in the CmpTraceMgr Component of multiple CODESYS products in multiple versions to write data into the stack which can lead to a denial-of-service condition, memory overwr
- 8.8 High severity
CODESYS Control RTE (SL): Out-of-bounds Write
An authenticated, remote attacker may use a stack based out-of-bounds write vulnerability in the CmpAppForce Component of multiple CODESYS products in multiple versions to write data into the stack which can lead to a denial-of-service condition, memory overwr
- 8.8 High severity
CODESYS Control RTE (SL): Out-of-bounds Write
An authenticated remote attacker may use a stack based out-of-bounds write vulnerability in the CmpTraceMgr Component of multiple CODESYS products in multiple versions to write data into the stack which can lead to a denial-of-service condition, memory overwri
- 8.8 High severity
CODESYS Control RTE (SL): Out-of-bounds Write
An authenticated, remote attacker may use a stack based out-of-bounds write vulnerability in the CmpTraceMgr Component of multiple CODESYS products in multiple versions to write data into the stack which can lead to a denial-of-service condition, memory overwr
- 8.8 High severity
CODESYS Control RTE (SL): Out-of-bounds Write
An authenticated remote attacker may use a stack based out-of-bounds write vulnerability in the CmpTraceMgr Component of multiple CODESYS products in multiple versions to write data into the stack which can lead to a denial-of-service condition, memory overwri
- 8.8 High severity
CODESYS Control RTE (SL): Out-of-bounds Write
An authenticated remote attacker may use a stack based out-of-bounds write vulnerability in multiple CODESYS products in multiple versions to write data into the stack which can lead to a denial-of-service condition, memory overwriting, or remote code executio
- 8.8 High severity
CODESYS Control RTE (SL): Out-of-bounds Write
An authenticated remote attacker may use a stack based out-of-bounds write vulnerability in multiple CODESYS products in multiple versions to write data into the stack which can lead to a denial-of-service condition, memory overwriting, or remote code executio
- 8.8 High severity
CODESYS Control RTE (SL): Out-of-bounds Write
An authenticated, remote attacker may use a out-of-bounds write vulnerability in multiple CODESYS products in multiple versions to write data into memory which can lead to a denial-of-service condition, memory overwriting, or remote code execution.
- 8.8 High severity
Control RTE (SL): Initialization of a Resource with an Insecure Default
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.
- 7.5 High severity
CODESYS Control RTE (SL): Uncontrolled Resource Consumption
In CmpChannelServer of CODESYS V3 in multiple versions an uncontrolled ressource consumption allows an unauthorized attacker to block new communication channel connections. Existing connections are not affected.