Description
In CmpBlkDrvTcp of CODESYS V3 in multiple versions an uncontrolled ressource consumption allows an unauthorized attacker to block new TCP connections. Existing connections are not affected.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| CODESYS | CODESYS Control RTE (SL) | V3 – < V3.5.18.20 | V3.5.18.20 |
| CODESYS | CODESYS Control RTE (for Beckhoff CX) SL | V3 – < V3.5.18.20 | V3.5.18.20 |
| CODESYS | CODESYS Control Win (SL) | V3 – < V3.5.18.20 | V3.5.18.20 |
| CODESYS | CODESYS Gateway | V3 – < V3.5.18.20 | V3.5.18.20 |
| CODESYS | CODESYS Edge Gateway for Windows | V3 – < V3.5.18.20 | V3.5.18.20 |
| CODESYS | CODESYS HMI (SL) | V3 – < V3.5.18.20 | V3.5.18.20 |
| CODESYS | CODESYS Development System V3 | V3 – < V3.5.18.10 | V3.5.18.10 |
| CODESYS | CODESYS Control Runtime System Toolkit | V3 – < V3.5.18.20 | V3.5.18.20 |
| CODESYS | CODESYS Embedded Target Visu Toolkit | V3 – < V3.5.18.20 | V3.5.18.20 |
| CODESYS | CODESYS Remote Target Visu Toolkit | V3 – < V3.5.18.20 | V3.5.18.20 |
| CODESYS | CODESYS Control for BeagleBone SL | V3 – < V4.5.0.0 | V4.5.0.0 |
| CODESYS | CODESYS Control for Beckhoff CX9020 SL | V3 – < V4.5.0.0 | V4.5.0.0 |
| CODESYS | CODESYS Control for emPC-A/iMX6 SL | V3 – < V4.5.0.0 | V4.5.0.0 |
| CODESYS | CODESYS Control for IOT2000 SL | V3 – < V4.5.0.0 | V4.5.0.0 |
| CODESYS | CODESYS Control for Linux SL | V3 – < V4.5.0.0 | V4.5.0.0 |
| CODESYS | CODESYS Control for PFC100 SL | V3 – < V4.5.0.0 | V4.5.0.0 |
| CODESYS | CODESYS Control for PFC200 SL | V3 – < V4.5.0.0 | V4.5.0.0 |
| CODESYS | CODESYS Control for PLCnext SL | V3 – < V4.5.0.0 | V4.5.0.0 |
| CODESYS | CODESYS Control for Raspberry Pi SL | V3 – < V4.5.0.0 | V4.5.0.0 |
| CODESYS | CODESYS Control for WAGO Touch Panels 600 SL | V3 – < V4.5.0.0 | V4.5.0.0 |
| CODESYS | CODESYS Edge Gateway for Linux | V3 – < V4.5.0.0 | V4.5.0.0 |
Advisories 2
- ICSA-26-076-01 CODESYS in Festo Automation Suite CISA ICS & IT advisories · Mar 17, 2026
- FSA-202601 Several CODESYS vulnerabilities in Festo Automation Suite CERT@VDE · Feb 26, 2026