What is CVE-2021-36765?

CVE-2021-36765 is a high-severity vulnerability in Codesys Ethernetip, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2021-08-04.

How severe is CVE-2021-36765?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2021-36765 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

NULL pointer dereference in Codesys Ethernetip

CVE-2021-36765

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.

EPSS: 0.010 (58.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

Affected products

Codesys Ethernetip
N/a — versions n/a

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

Public proof-of-concept exploits

References

cve@mitre.org (x_refsource_CONFIRM, Vendor Advisory)

Frequently asked questions

What is CVE-2021-36765?: CVE-2021-36765 is a high-severity vulnerability in Codesys Ethernetip, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2021-08-04.
How severe is CVE-2021-36765?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2021-36765 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.