CVE-2021-33485
published 2021-08-03CVE-2021-33485: CODESYS Control Runtime system before 3.5.17.10 has a Heap-based Buffer Overflow.
PriorityP353critical9.8CVSS 3.1
AVNACLPRNUINSUCHIHAH
EPSS
1.14%
63.1th percentile
CODESYS Control Runtime system before 3.5.17.10 has a Heap-based Buffer Overflow.
Affected
8 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| codesys | control | < 4.2.0.0 | 4.2.0.0 |
| codesys | control | <= 4.2.0.0 | — |
| codesys | control_rte | < 3.5.17.10 | 3.5.17.10 |
| codesys | control_runtime_system_toolkit | < 3.5.17.10 | 3.5.17.10 |
| codesys | control_win_sl | < 3.5.17.10 | 3.5.17.10 |
| codesys | embedded_target_visu_toolkit | < 3.5.17.10 | 3.5.17.10 |
| codesys | hmi | < 3.5.17.10 | 3.5.17.10 |
| codesys | remote_target_visu_toolkit | < 3.5.17.10 | 3.5.17.10 |
CVSS provenance
nvdv3.19.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
nvdv2.07.5HIGHAV:N/AC:L/Au:N/C:P/I:P/A:P
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CISA ICS
CODESYS in Festo Automation Suite
cisa_ics·2026-03-17
CODESYS in Festo Automation Suite
ICS Advisory
##
CODESYS in Festo Automation Suite
Release DateMarch 17, 2026
Alert CodeICSA-26-076-01
Related topics:
Industrial Control System Vulnerabilities, Industrial Control Systems
View CSAF
## Summary
3. TECHNICAL DETAILS
The following versions of CODESYS in Festo Automation Suite are affected:
- FESTO Software Festo Automation Suite (versions prior to 2.8.0.138) installed with CODESYS Software CODESYS Development System (3.0) vers:all/*
- FESTO Software Festo Automation Suite (versions prior to 2.8.0.138) installed with CODESYS Software CODESYS Development System (3.5.16.10) vers:all/*
- FESTO Software Festo Automation Suite (2.8.0.137) installed with CODESYS Software CODESYS Development System (3.0) vers:all/*
- FESTO Software Festo Automation
CISA ICS
Festo Controller CECC-S,-LK,-D Family Firmware (Update A)
cisa_ics·2025-11-13
Festo Controller CECC-S,-LK,-D Family Firmware (Update A)
ICS Advisory
##
Festo Controller CECC-S,-LK,-D Family Firmware (Update A)
Last RevisedNovember 13, 2025
Alert CodeICSA-25-273-04
Related topics:
Industrial Control System Vulnerabilities, Industrial Control Systems
View CSAF
## 1. EXECUTIVE SUMMARY
- CVSS v3 9.8
- ATTENTION: Exploitable remotely/low attack complexity
- Vendor: Festo
- Equipment: Controller CECC-S,-LK,-D Family Firmware
- Vulnerabilities: Exposure of Resource to Wrong Sphere, Untrusted Pointer Dereference, NULL Pointer Dereference, Files or Directories Accessible to External Parties, Out-of-bounds Write, Improper Privilege Management, Incorrect Permission Assignment for Critical Resource, Buffer Copy without Checking Size of Input ('Classic Buffer Overflow'), Missing Release of Memory afte
GHSA
GHSA-mrr3-f59g-2946: CODESYS Control Runtime system before 3
ghsa_unreviewed·2022-05-24
CVE-2021-33485 [CRITICAL] CWE-787 GHSA-mrr3-f59g-2946: CODESYS Control Runtime system before 3
CODESYS Control Runtime system before 3.5.17.10 has a Heap-based Buffer Overflow.
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
2021-08-03
Published