CODESYS: Incorrect calculation of buffer size can cause DoS on CODESYS OPC UA products
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.
- Published
- Jun 4, 2024
- Updated
- Jun 17, 2026
- EPSS
- 0.6% · 45th percentile
- CWE
- CWE-131
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Report tools
Action score
30
Monitor
Low priority for now.
- CVSS
- 30 / 40 · 7.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.6%
CISA SSVC decision
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- —
- CNA · CERTVDE
- 7.5
- NVD has not scored this yet; the score shown is the CNA’s.
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| codesys | control for empc-a/imx6 sl | cpe:2.3:a:codesys:control_for_empc-a/imx6_sl |
| codesys | control for beaglebone sl | cpe:2.3:a:codesys:control_for_beaglebone_sl |
| codesys | control for iot2000 sl | cpe:2.3:a:codesys:control_for_iot2000_sl |
| codesys | control for linux arm sl | cpe:2.3:a:codesys:control_for_linux_arm_sl |
| codesys | control for linux sl | cpe:2.3:a:codesys:control_for_linux_sl |
| codesys | control for pfc200 sl | cpe:2.3:a:codesys:control_for_pfc200_sl |
| codesys | control for plcnext sl | cpe:2.3:a:codesys:control_for_plcnext_sl |
| codesys | control for raspberry pi sl | cpe:2.3:a:codesys:control_for_raspberry_pi_sl |
| codesys | control for wago touch panels 600 sl | cpe:2.3:a:codesys:control_for_wago_touch_panels_600_sl |
| codesys | control rte (for beckhoff cx) sl | cpe:2.3:a:codesys:control_rte_(for_beckhoff_cx)_sl |
| codesys | control rte (sl) | cpe:2.3:a:codesys:control_rte_(sl) |
| codesys | control win (sl) | cpe:2.3:a:codesys:control_win_(sl) |
and 2 more
Versions reported by the vendor
Affected version ranges reported by the assigning authority (CERTVDE). Independent of NVD's CPE analysis and usually ahead of it.
CODESYS CODESYS Control for BeagleBone SL
- before 4.12.0.0affected · semver
CODESYS CODESYS Control for emPC-A/iMX6 SL
- before 4.12.0.0affected · semver
CODESYS CODESYS Control for IOT2000 SL
- before 4.12.0.0affected · semver
CODESYS CODESYS Control for Linux ARM SL
- before 4.12.0.0affected · semver
CODESYS CODESYS Control for Linux SL
- before 4.12.0.0affected · semver
CODESYS CODESYS Control for PFC100 SL
- before 4.12.0.0affected · semver
CODESYS CODESYS Control for PFC200 SL
- before 4.12.0.0affected · semver
CODESYS CODESYS Control for PLCnext SL
- before 4.12.0.0affected · semver
CODESYS CODESYS Control for Raspberry Pi SL
- before 4.12.0.0affected · semver
CODESYS CODESYS Control for WAGO Touch Panels 600 SL
- before 4.12.0.0affected · semver
CODESYS CODESYS Control RTE (for Beckhoff CX) SL
- before 3.5.20.10affected · semver
CODESYS CODESYS Control RTE (SL)
- before 3.5.20.10affected · semver
Same product
codesys: all recordsOther highest-scoring records for the same primary product.
- CVE-2024-8175CODESYS: web server vulnerable to DoS30Monitor
- CVE-2025-0694CODESYS Control V3 removable media path traversal26Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| CODESYS CODESYS Control for BeagleBone SL | 4.12.0.0 | Vendor (CNA) |
| CODESYS CODESYS Control for emPC-A/iMX6 SL | 4.12.0.0 | Vendor (CNA) |
| CODESYS CODESYS Control for IOT2000 SL | 4.12.0.0 | Vendor (CNA) |
| CODESYS CODESYS Control for Linux ARM SL | 4.12.0.0 | Vendor (CNA) |
| CODESYS CODESYS Control for Linux SL | 4.12.0.0 | Vendor (CNA) |
| CODESYS CODESYS Control for PFC100 SL | 4.12.0.0 | Vendor (CNA) |
| CODESYS CODESYS Control for PFC200 SL | 4.12.0.0 | Vendor (CNA) |
| CODESYS CODESYS Control for PLCnext SL | 4.12.0.0 | Vendor (CNA) |
| CODESYS CODESYS Control for Raspberry Pi SL | 4.12.0.0 | Vendor (CNA) |
| CODESYS CODESYS Control for WAGO Touch Panels 600 SL | 4.12.0.0 | Vendor (CNA) |
| CODESYS CODESYS Control RTE (for Beckhoff CX) SL | 3.5.20.10 | Vendor (CNA) |
| CODESYS CODESYS Control RTE (SL) | 3.5.20.10 | Vendor (CNA) |
| CODESYS CODESYS Control Win (SL) | 3.5.20.10 | Vendor (CNA) |
| CODESYS CODESYS HMI (SL) | 3.5.20.10 | Vendor (CNA) |
| CODESYS CODESYS Runtime Toolkit | 3.5.20.10 | Vendor (CNA) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
- ABB Schweiz AG.reporter
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- none
- Integrity
- none
- Availability
- high · the service can be disrupted
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
CWE-131 · Incorrect Calculation of Buffer SizeCVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
nvd-secondary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
ATT&CK techniques
—
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- cert.vde.com/en/advisories/VDE-2024-026
- customers.codesys.com/index.php?eID=dumpFile&t=f&f=18355&token=e3e5a937ce72602bec39718ddc2f4ba6d983ccd1&download=
Vendor advisories and official records. Exploit/PoC links are deliberately left out.