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TI-2021-13604 Aliases CVE-2021-34586GHSA-hmwx-8xfx-mg6m

CODESYS V2 web server: crafted requests could trigger a null pointer dereference (DoS)

Priority MEDIUM 48CWE-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

In the CODESYS V2 web server prior to V1.1.9.22 crafted web server requests may cause a Null pointer dereference in the CODESYS web server and may result in a denial-of-service condition.

Why it matters now

EPSS 0.13741 96th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed CODESYS V2 (CODESYS): V1.1.9.22

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
CODESYSCODESYS V2all web servers to before V1.1.9.22V1.1.9.22Patch availableCNA
  • CODESYS V2 VendorCODESYS Affected all web servers to before V1.1.9.22 Fixed in V1.1.9.22 Patch available CNA

CPE configurations NVD · 55

CPEVersionsRoleVendor
cpe:2.3:o:wago:750-823_firmware:*:*:*:*:*:*:*:*before fw10VulnerableWAGO
cpe:2.3:h:wago:750-823:-:*:*:*:*:*:*:*not specified by NVDRunning onWAGO
cpe:2.3:o:wago:750-829_firmware:*:*:*:*:*:*:*:*before fw17VulnerableWAGO
cpe:2.3:h:wago:750-829:-:*:*:*:*:*:*:*not specified by NVDRunning onWAGO
cpe:2.3:o:wago:750-831_firmware:*:*:*:*:*:*:*:*before fw17VulnerableWAGO
cpe:2.3:h:wago:750-831:-:*:*:*:*:*:*:*not specified by NVDRunning onWAGO
cpe:2.3:o:wago:750-832_firmware:*:*:*:*:*:*:*:*before fw10VulnerableWAGO
cpe:2.3:h:wago:750-832:-:*:*:*:*:*:*:*not specified by NVDRunning onWAGO
cpe:2.3:o:wago:750-852_firmware:*:*:*:*:*:*:*:*before fw17VulnerableWAGO
cpe:2.3:h:wago:750-852:-:*:*:*:*:*:*:*not specified by NVDRunning onWAGO
  • cpe:2.3:o:wago:750-823_firmware:*:*:*:*:*:*:*:* Versions before fw10 Vulnerable ·WAGO
  • cpe:2.3:h:wago:750-823:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·WAGO
  • cpe:2.3:o:wago:750-829_firmware:*:*:*:*:*:*:*:* Versions before fw17 Vulnerable ·WAGO
  • cpe:2.3:h:wago:750-829:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·WAGO
  • cpe:2.3:o:wago:750-831_firmware:*:*:*:*:*:*:*:* Versions before fw17 Vulnerable ·WAGO
  • cpe:2.3:h:wago:750-831:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·WAGO
  • cpe:2.3:o:wago:750-832_firmware:*:*:*:*:*:*:*:* Versions before fw10 Vulnerable ·WAGO
  • cpe:2.3:h:wago:750-832:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·WAGO
  • cpe:2.3:o:wago:750-852_firmware:*:*:*:*:*:*:*:* Versions before fw17 Vulnerable ·WAGO
  • cpe:2.3:h:wago:750-852:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·WAGO
Show 45 more CPE
CPEVersionsRoleVendor
cpe:2.3:o:wago:750-862_firmware:*:*:*:*:*:*:*:*before fw10VulnerableWAGO
cpe:2.3:h:wago:750-862:-:*:*:*:*:*:*:*not specified by NVDRunning onWAGO
cpe:2.3:o:wago:750-880_firmware:*:*:*:*:*:*:*:*before fw17VulnerableWAGO
cpe:2.3:h:wago:750-880:-:*:*:*:*:*:*:*not specified by NVDRunning onWAGO
cpe:2.3:o:wago:750-881_firmware:*:*:*:*:*:*:*:*before fw17VulnerableWAGO
cpe:2.3:h:wago:750-881:-:*:*:*:*:*:*:*not specified by NVDRunning onWAGO
cpe:2.3:o:wago:750-882_firmware:*:*:*:*:*:*:*:*before fw17VulnerableWAGO
cpe:2.3:h:wago:750-882:-:*:*:*:*:*:*:*not specified by NVDRunning onWAGO
cpe:2.3:o:wago:750-885_firmware:*:*:*:*:*:*:*:*before fw17VulnerableWAGO
cpe:2.3:h:wago:750-885:-:*:*:*:*:*:*:*not specified by NVDRunning onWAGO
cpe:2.3:o:wago:750-889_firmware:*:*:*:*:*:*:*:*before fw17VulnerableWAGO
cpe:2.3:h:wago:750-889:-:*:*:*:*:*:*:*not specified by NVDRunning onWAGO
cpe:2.3:o:wago:750-890_firmware:*:*:*:*:*:*:*:*before fw10VulnerableWAGO
cpe:2.3:h:wago:750-890:-:*:*:*:*:*:*:*not specified by NVDRunning onWAGO
cpe:2.3:o:wago:750-891_firmware:*:*:*:*:*:*:*:*before fw10VulnerableWAGO
cpe:2.3:h:wago:750-891:-:*:*:*:*:*:*:*not specified by NVDRunning onWAGO
cpe:2.3:o:wago:750-893_firmware:*:*:*:*:*:*:*:*before fw10VulnerableWAGO
cpe:2.3:h:wago:750-893:-:*:*:*:*:*:*:*not specified by NVDRunning onWAGO
cpe:2.3:o:wago:750-8202_firmware:*:*:*:*:*:*:*:*before fw20VulnerableWAGO
cpe:2.3:h:wago:750-8202:-:*:*:*:*:*:*:*not specified by NVDRunning onWAGO
cpe:2.3:o:wago:750-8203_firmware:*:*:*:*:*:*:*:*before fw20VulnerableWAGO
cpe:2.3:h:wago:750-8203:-:*:*:*:*:*:*:*not specified by NVDRunning onWAGO
cpe:2.3:o:wago:750-8204_firmware:*:*:*:*:*:*:*:*before fw20VulnerableWAGO
cpe:2.3:h:wago:750-8204:-:*:*:*:*:*:*:*not specified by NVDRunning onWAGO
cpe:2.3:o:wago:750-8206_firmware:*:*:*:*:*:*:*:*before fw20VulnerableWAGO
cpe:2.3:h:wago:750-8206:-:*:*:*:*:*:*:*not specified by NVDRunning onWAGO
cpe:2.3:o:wago:750-8207_firmware:*:*:*:*:*:*:*:*before fw20VulnerableWAGO
cpe:2.3:h:wago:750-8207:-:*:*:*:*:*:*:*not specified by NVDRunning onWAGO
cpe:2.3:o:wago:750-8208_firmware:*:*:*:*:*:*:*:*before fw20VulnerableWAGO
cpe:2.3:h:wago:750-8208:-:*:*:*:*:*:*:*not specified by NVDRunning onWAGO
cpe:2.3:o:wago:750-8210_firmware:*:*:*:*:*:*:*:*before fw20VulnerableWAGO
cpe:2.3:h:wago:750-8210:-:*:*:*:*:*:*:*not specified by NVDRunning onWAGO
cpe:2.3:o:wago:750-8211_firmware:*:*:*:*:*:*:*:*before fw20VulnerableWAGO
cpe:2.3:h:wago:750-8211:-:*:*:*:*:*:*:*not specified by NVDRunning onWAGO
cpe:2.3:o:wago:750-8212_firmware:*:*:*:*:*:*:*:*before fw20VulnerableWAGO
cpe:2.3:h:wago:750-8212:-:*:*:*:*:*:*:*not specified by NVDRunning onWAGO
cpe:2.3:o:wago:750-8213_firmware:*:*:*:*:*:*:*:*before fw20VulnerableWAGO
cpe:2.3:h:wago:750-8213:-:*:*:*:*:*:*:*not specified by NVDRunning onWAGO
cpe:2.3:o:wago:750-8214_firmware:*:*:*:*:*:*:*:*before fw20VulnerableWAGO
cpe:2.3:h:wago:750-8214:-:*:*:*:*:*:*:*not specified by NVDRunning onWAGO
cpe:2.3:o:wago:750-8216_firmware:*:*:*:*:*:*:*:*before fw20VulnerableWAGO
cpe:2.3:h:wago:750-8216:-:*:*:*:*:*:*:*not specified by NVDRunning onWAGO
cpe:2.3:o:wago:750-8217_firmware:*:*:*:*:*:*:*:*before fw20VulnerableWAGO
cpe:2.3:h:wago:750-8217:-:*:*:*:*:*:*:*not specified by NVDRunning onWAGO
cpe:2.3:a:codesys:codesys:*:*:*:*:*:*:*:*before 1.1.9.22VulnerableCODESYS
  • cpe:2.3:o:wago:750-862_firmware:*:*:*:*:*:*:*:* Versions before fw10 Vulnerable ·WAGO
  • cpe:2.3:h:wago:750-862:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·WAGO
  • cpe:2.3:o:wago:750-880_firmware:*:*:*:*:*:*:*:* Versions before fw17 Vulnerable ·WAGO
  • cpe:2.3:h:wago:750-880:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·WAGO
  • cpe:2.3:o:wago:750-881_firmware:*:*:*:*:*:*:*:* Versions before fw17 Vulnerable ·WAGO
  • cpe:2.3:h:wago:750-881:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·WAGO
  • cpe:2.3:o:wago:750-882_firmware:*:*:*:*:*:*:*:* Versions before fw17 Vulnerable ·WAGO
  • cpe:2.3:h:wago:750-882:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·WAGO
  • cpe:2.3:o:wago:750-885_firmware:*:*:*:*:*:*:*:* Versions before fw17 Vulnerable ·WAGO
  • cpe:2.3:h:wago:750-885:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·WAGO
  • cpe:2.3:o:wago:750-889_firmware:*:*:*:*:*:*:*:* Versions before fw17 Vulnerable ·WAGO
  • cpe:2.3:h:wago:750-889:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·WAGO
  • cpe:2.3:o:wago:750-890_firmware:*:*:*:*:*:*:*:* Versions before fw10 Vulnerable ·WAGO
  • cpe:2.3:h:wago:750-890:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·WAGO
  • cpe:2.3:o:wago:750-891_firmware:*:*:*:*:*:*:*:* Versions before fw10 Vulnerable ·WAGO
  • cpe:2.3:h:wago:750-891:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·WAGO
  • cpe:2.3:o:wago:750-893_firmware:*:*:*:*:*:*:*:* Versions before fw10 Vulnerable ·WAGO
  • cpe:2.3:h:wago:750-893:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·WAGO
  • cpe:2.3:o:wago:750-8202_firmware:*:*:*:*:*:*:*:* Versions before fw20 Vulnerable ·WAGO
  • cpe:2.3:h:wago:750-8202:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·WAGO
  • cpe:2.3:o:wago:750-8203_firmware:*:*:*:*:*:*:*:* Versions before fw20 Vulnerable ·WAGO
  • cpe:2.3:h:wago:750-8203:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·WAGO
  • cpe:2.3:o:wago:750-8204_firmware:*:*:*:*:*:*:*:* Versions before fw20 Vulnerable ·WAGO
  • cpe:2.3:h:wago:750-8204:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·WAGO
  • cpe:2.3:o:wago:750-8206_firmware:*:*:*:*:*:*:*:* Versions before fw20 Vulnerable ·WAGO
  • cpe:2.3:h:wago:750-8206:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·WAGO
  • cpe:2.3:o:wago:750-8207_firmware:*:*:*:*:*:*:*:* Versions before fw20 Vulnerable ·WAGO
  • cpe:2.3:h:wago:750-8207:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·WAGO
  • cpe:2.3:o:wago:750-8208_firmware:*:*:*:*:*:*:*:* Versions before fw20 Vulnerable ·WAGO
  • cpe:2.3:h:wago:750-8208:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·WAGO
  • cpe:2.3:o:wago:750-8210_firmware:*:*:*:*:*:*:*:* Versions before fw20 Vulnerable ·WAGO
  • cpe:2.3:h:wago:750-8210:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·WAGO
  • cpe:2.3:o:wago:750-8211_firmware:*:*:*:*:*:*:*:* Versions before fw20 Vulnerable ·WAGO
  • cpe:2.3:h:wago:750-8211:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·WAGO
  • cpe:2.3:o:wago:750-8212_firmware:*:*:*:*:*:*:*:* Versions before fw20 Vulnerable ·WAGO
  • cpe:2.3:h:wago:750-8212:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·WAGO
  • cpe:2.3:o:wago:750-8213_firmware:*:*:*:*:*:*:*:* Versions before fw20 Vulnerable ·WAGO
  • cpe:2.3:h:wago:750-8213:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·WAGO
  • cpe:2.3:o:wago:750-8214_firmware:*:*:*:*:*:*:*:* Versions before fw20 Vulnerable ·WAGO
  • cpe:2.3:h:wago:750-8214:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·WAGO
  • cpe:2.3:o:wago:750-8216_firmware:*:*:*:*:*:*:*:* Versions before fw20 Vulnerable ·WAGO
  • cpe:2.3:h:wago:750-8216:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·WAGO
  • cpe:2.3:o:wago:750-8217_firmware:*:*:*:*:*:*:*:* Versions before fw20 Vulnerable ·WAGO
  • cpe:2.3:h:wago:750-8217:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·WAGO
  • cpe:2.3:a:codesys:codesys:*:*:*:*:*:*:*:* Versions before 1.1.9.22 Vulnerable ·CODESYS

Remediation

  • Fix · CNA CODESYS V2 (CODESYS) Fixed in V1.1.9.22

Fixed in the same release

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

  • Release ·

    CODESYS V2 V1.1.9.22

    4 records Highest priority Priority MEDIUM 3 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2021-13601 CODESYS V2 web server: crafted requests could trigger a heap-based buffer overflow (DoS)Priority MEDIUM 44
    • TI-2021-13602 CODESYS V2 web server: crafted requests could trigger a buffer over-read (DoS)Priority MEDIUM 41
    • TI-2021-13603 CODESYS V2 web server: crafted requests could trigger a pointer dereference with an invalid address (DoS)Priority LOW 35
    Show all 4 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-34586
  2. 2026-10-03 Alias added: GHSA-hmwx-8xfx-mg6m

References

Exploit 1

Advisory 1

  • TI-2019-12244 CODESYS V2.3 ENI server up to V3.2.2.24 has a Buffer Overflow. CVSS 3.1CRITICAL 9.8
  • TI-2021-13601 CODESYS V2 web server: crafted requests could trigger a heap-based buffer overflow (DoS) CVSS 3.1HIGH 7.5
  • TI-2021-13602 CODESYS V2 web server: crafted requests could trigger a buffer over-read (DoS) CVSS 3.1CRITICAL 9.1
  • TI-2019-10170 3S-Smart Software Solutions GmbH CODESYS V3 Library Manager, all versions prior to… CVSS 3.1HIGH 8.6
  • TI-2021-04914 Deserialization of untrusted data in CODESYS CVSS 3.1HIGH 7.8
  • TI-2021-04913 Deserialization of untrusted data in CODESYS CVSS 3.1HIGH 7.8
See all 12 →

Sources

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