Description
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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| CODESYS | CODESYS PLCHandler | 3.5.21.0 – < 3.5.21.40 | 3.5.21.40 |
| CODESYS | CODESYS Remote Target Visu | 3.5.21.0 – < 3.5.21.40 | 3.5.21.40 |
| CODESYS | CODESYS Runtime Toolkit | 3.5.21.0 – < 3.5.21.40 | 3.5.21.40 |
| CODESYS | CODESYS Control for BeagleBone SL | 4.15.0.0 – < 4.19.0.0 | 4.19.0.0 |
| CODESYS | CODESYS Control for emPC-A/iMX6 SL | 4.15.0.0 – < 4.19.0.0 | 4.19.0.0 |
| CODESYS | CODESYS Control for IOT2000 SL | 4.15.0.0 – < 4.19.0.0 | 4.19.0.0 |
| CODESYS | CODESYS Control for Linux ARM SL | 4.15.0.0 – < 4.19.0.0 | 4.19.0.0 |
| CODESYS | CODESYS Control for Linux SL | 4.15.0.0 – < 4.19.0.0 | 4.19.0.0 |
| CODESYS | CODESYS Control for PFC100 SL | 4.15.0.0 – < 4.19.0.0 | 4.19.0.0 |
| CODESYS | CODESYS Control for PFC200 SL | 4.15.0.0 – < 4.19.0.0 | 4.19.0.0 |
| CODESYS | CODESYS Control for PLCnext SL | 4.15.0.0 – < 4.19.0.0 | 4.19.0.0 |
| CODESYS | CODESYS Control for Raspberry Pi SL | 4.15.0.0 – < 4.19.0.0 | 4.19.0.0 |
| CODESYS | CODESYS Control for WAGO Touch Panels 600 SL | 4.15.0.0 – < 4.19.0.0 | 4.19.0.0 |
| CODESYS | CODESYS Edge Gateway for Linux | 4.15.0.0 – < 4.19.0.0 | 4.19.0.0 |
| CODESYS | CODESYS TargetVisu for Linux SL | 4.15.0.0 – < 4.19.0.0 | 4.19.0.0 |
| CODESYS | CODESYS Virtual Control SL | 4.15.0.0 – < 4.19.0.0 | 4.19.0.0 |
Advisories 3
- VDE-2025-081 WAGO: Multiple PLCs and Communication Components are Affected by multiple Vulnerabilities leading to RCE CERT@VDE · Nov 6, 2026
- WID-SEC-2025-2700 CODESYS Control und Development System: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 28, 2026
- ADVISORY2025-09_VDE-2025-099 CODESYS Control - Linux/QNX SysSocket flaw CERT@VDE · Feb 12, 2026