{"id":"CVE-2021-36765","aliases":["EUVD-2021-23353","GHSA-3mpj-h64q-x7gf"],"status":"published","title":"In CODESYS EtherNetIP before 4.1.0.0, specific EtherNet/IP requests may cause a null pointer...","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.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.00986,"percentile":0.62686,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-476"],"published":"2021-08-04T13:22:18Z","modified":"2026-06-17T03:59:07Z","products":[{"vendor":"codesys","product":"ethernetip"}],"references":[{"url":"https://customers.codesys.com/index.php?eID=dumpFile\u0026t=f\u0026f=16806\u0026token=3b0c51de5a6e35bccbb413ddaaa56551ca5490f6\u0026download=","tags":["x_refsource_CONFIRM","x_transferred","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-36765"},{"url":"https://github.com/advisories/GHSA-3mpj-h64q-x7gf"}],"sources":{"cve":[{"id":"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.","status":"published","published":"2021-08-04T13:22:18Z","modified":"2024-08-04T01:01:59.791Z","updated_at":"2026-11-02T14:33:05.989686Z"}],"euvd":[{"id":"EUVD-2021-23353","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.","status":"published","published":"2021-08-04T13:22:18Z","modified":"2024-08-04T01:01:59Z","updated_at":"2026-11-03T03:24:29.329171Z"}],"ghsa":[{"id":"GHSA-3mpj-h64q-x7gf","title":"In CODESYS EtherNetIP before 4.1.0.0, specific EtherNet/IP requests may cause a null pointer...","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.","status":"published","published":"2022-05-24T19:10:00Z","modified":"2023-01-30T05:01:16Z","cwes":["CWE-476"],"updated_at":"2026-11-02T14:46:22.480874Z"}],"nvd":[{"id":"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.","status":"published","published":"2021-08-04T14:15:08.54Z","modified":"2026-06-17T03:59:07.82Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:P/I:N/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-476"],"updated_at":"2026-11-02T14:06:56.562207Z"}]}}