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TI-2025-27654 Aliases CVE-2025-41691GHSA-wxg9-7gqq-wxgf

CODESYS Control DoS via Unauthenticated NULL Pointer Dereference

Priority MEDIUM 40CWE-476Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-476.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00639 50th percentileScored 2026-11-07
Fix Fixed Control RTE (SL) (CODESYS): 3.5.21.20Control RTE (for Beckhoff CX) SL (CODESYS): 3.5.21.20+13 more products

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
CODESYSControl RTE (SL)3.5.21.10 to before 3.5.21.203.5.21.20Patch availableCNA
CODESYSControl RTE (for Beckhoff CX) SL3.5.21.10 to before 3.5.21.203.5.21.20Patch availableCNA
CODESYSControl Win (SL)3.5.21.10 to before 3.5.21.203.5.21.20Patch availableCNA
CODESYSHMI (SL)3.5.21.10 to before 3.5.21.203.5.21.20Patch availableCNA
CODESYSControl for BeagleBone SL4.16.0.0 to before 4.17.0.04.17.0.0Patch availableCNA
CODESYSControl for emPC-A/iMX6 SL4.16.0.0 to before 4.17.0.04.17.0.0Patch availableCNA
CODESYSControl for IOT2000 SL4.16.0.0 to before 4.17.0.04.17.0.0Patch availableCNA
CODESYSControl for Linux ARM SL4.16.0.0 to before 4.17.0.04.17.0.0Patch availableCNA
CODESYSControl for Linux SL4.16.0.0 to before 4.17.0.04.17.0.0Patch availableCNA
CODESYSControl for PFC100 SL4.16.0.0 to before 4.17.0.04.17.0.0Patch availableCNA
CODESYSControl for PFC200 SL4.16.0.0 to before 4.17.0.04.17.0.0Patch availableCNA
CODESYSControl for PLCnext SL4.16.0.0 to before 4.17.0.04.17.0.0Patch availableCNA
CODESYSControl for Raspberry Pi SL4.16.0.0 to before 4.17.0.04.17.0.0Patch availableCNA
CODESYSControl for WAGO Touch Panels 600 SL4.16.0.0 to before 4.17.0.04.17.0.0Patch availableCNA
CODESYSVirtual Control SL4.16.0.0 to before 4.17.0.04.17.0.0Patch availableCNA
  • Control RTE (SL) VendorCODESYS Affected 3.5.21.10 to before 3.5.21.20 Fixed in 3.5.21.20 Patch available CNA
  • Control RTE (for Beckhoff CX) SL VendorCODESYS Affected 3.5.21.10 to before 3.5.21.20 Fixed in 3.5.21.20 Patch available CNA
  • Control Win (SL) VendorCODESYS Affected 3.5.21.10 to before 3.5.21.20 Fixed in 3.5.21.20 Patch available CNA
  • HMI (SL) VendorCODESYS Affected 3.5.21.10 to before 3.5.21.20 Fixed in 3.5.21.20 Patch available CNA
  • Control for BeagleBone SL VendorCODESYS Affected 4.16.0.0 to before 4.17.0.0 Fixed in 4.17.0.0 Patch available CNA
  • Control for emPC-A/iMX6 SL VendorCODESYS Affected 4.16.0.0 to before 4.17.0.0 Fixed in 4.17.0.0 Patch available CNA
  • Control for IOT2000 SL VendorCODESYS Affected 4.16.0.0 to before 4.17.0.0 Fixed in 4.17.0.0 Patch available CNA
  • Control for Linux ARM SL VendorCODESYS Affected 4.16.0.0 to before 4.17.0.0 Fixed in 4.17.0.0 Patch available CNA
  • Control for Linux SL VendorCODESYS Affected 4.16.0.0 to before 4.17.0.0 Fixed in 4.17.0.0 Patch available CNA
  • Control for PFC100 SL VendorCODESYS Affected 4.16.0.0 to before 4.17.0.0 Fixed in 4.17.0.0 Patch available CNA
  • Control for PFC200 SL VendorCODESYS Affected 4.16.0.0 to before 4.17.0.0 Fixed in 4.17.0.0 Patch available CNA
  • Control for PLCnext SL VendorCODESYS Affected 4.16.0.0 to before 4.17.0.0 Fixed in 4.17.0.0 Patch available CNA
  • Control for Raspberry Pi SL VendorCODESYS Affected 4.16.0.0 to before 4.17.0.0 Fixed in 4.17.0.0 Patch available CNA
  • Control for WAGO Touch Panels 600 SL VendorCODESYS Affected 4.16.0.0 to before 4.17.0.0 Fixed in 4.17.0.0 Patch available CNA
  • Virtual Control SL VendorCODESYS Affected 4.16.0.0 to before 4.17.0.0 Fixed in 4.17.0.0 Patch available CNA

Remediation

  • Fix · CNA Control RTE (SL) (CODESYS) Fixed in 3.5.21.20
  • Fix · CNA Control RTE (for Beckhoff CX) SL (CODESYS) Fixed in 3.5.21.20
  • Fix · CNA Control Win (SL) (CODESYS) Fixed in 3.5.21.20
  • Fix · CNA HMI (SL) (CODESYS) Fixed in 3.5.21.20
  • Fix · CNA Control for BeagleBone SL (CODESYS) Fixed in 4.17.0.0
  • Fix · CNA Control for emPC-A/iMX6 SL (CODESYS) Fixed in 4.17.0.0
  • Fix · CNA Control for IOT2000 SL (CODESYS) Fixed in 4.17.0.0
  • Fix · CNA Control for Linux ARM SL (CODESYS) Fixed in 4.17.0.0
  • Fix · CNA Control for Linux SL (CODESYS) Fixed in 4.17.0.0
  • Fix · CNA Control for PFC100 SL (CODESYS) Fixed in 4.17.0.0
  • Fix · CNA Control for PFC200 SL (CODESYS) Fixed in 4.17.0.0
  • Fix · CNA Control for PLCnext SL (CODESYS) Fixed in 4.17.0.0
  • Fix · CNA Control for Raspberry Pi SL (CODESYS) Fixed in 4.17.0.0
  • Fix · CNA Control for WAGO Touch Panels 600 SL (CODESYS) Fixed in 4.17.0.0
  • Fix · CNA Virtual Control SL (CODESYS) Fixed in 4.17.0.0

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    CODESYS Control RTE (SL), Control RTE (for Beckhoff CX) SL and 13 more products 3.5.21.20, 4.17.0.0

    2 records Highest priority Priority MEDIUM 1 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2025-27625 CODESYS Control PKI Exposure Enables Remote Certificate AccessPriority LOW 38
    Show all 2 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-41691
  2. 2026-10-03 Alias added: GHSA-wxg9-7gqq-wxgf
  3. 2026-11-05 EPSS moved to the 50th–90th percentile

References

Other 1

  • TI-2021-12888 CODESYS Control Runtime system before 3.5.17.10 has a Heap-based Buffer Overflow. CVSS 3.1CRITICAL 9.8
  • TI-2019-10180 Stack-based buffer overflow in CODESYS V3 web server CVSS 3.1CRITICAL 9.8
  • TI-2021-13604 CODESYS V2 web server: crafted requests could trigger a null pointer dereference (DoS) CVSS 3.1HIGH 7.5
  • TI-2020-08257 CODESYS V3 web server before 3.5.15.40, as used in CODESYS Control runtime systems, has a buffer overflow. CVSS 3.1CRITICAL 9.8
  • TI-2019-13592 CODESYS 3 web server before 3.5.15.20, as distributed with CODESYS Control runtime systems, has a Buffer Overflow. CVSS 3.1CRITICAL 9.8
  • TI-2017-03937 Unrestricted file upload in 3S-Smart Software Solutions GmbH CODESYS Web Server CVSS 3.0CRITICAL 9.8
See all 155 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences