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High severity7.5NVD Advisory· Published Aug 4, 2021· Updated Jun 17, 2026

CVE-2021-36765

CVE-2021-36765

Description

In CODESYS EtherNetIP before 4.1.0.0, specific EtherNet/IP requests may cause a null pointer dereference in the downloaded vulnerable EtherNet/IP stack that is executed by the CODESYS Control runtime system.

Affected products

3
  • Codesys/EtherNetIP2 versions
    cpe:2.3:a:codesys:ethernetip:*:*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:a:codesys:ethernetip:*:*:*:*:*:*:*:*range: <4.1.0.0
    • (no CPE)range: <4.1.0.0
  • CODESYS/EtherNetIPdescription

Patches

Vulnerability mechanics

References

1

News mentions

0

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