{"cve":"CVE-2021-36765","nvd":{"published":"2021-08-04T14:15:08.540","modified":"2026-06-17T03:59:07.820","status":"Modified","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","score":7.5},"cwes":["CWE-476"],"references":["https://customers.codesys.com/index.php?eID=dumpFile&t=f&f=16806&token=3b0c51de5a6e35bccbb413ddaaa56551ca5490f6&download=","https://customers.codesys.com/index.php?eID=dumpFile&t=f&f=16806&token=3b0c51de5a6e35bccbb413ddaaa56551ca5490f6&download="],"products":["codesys:ethernetip"],"source":"nvd","synced_at":"2026-10-19T21:21:13.713336758+00:00"},"epss":{"cve":"CVE-2021-36765","score":0.00986,"percentile":0.62403,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}