{"id":"CVE-2021-36764","aliases":["EUVD-2021-23352","GHSA-qpw7-wx2f-6gc3"],"status":"published","title":"In CODESYS Gateway V3 before 3.5.17.10, there is a NULL Pointer Dereference. Crafted...","description":"In CODESYS Gateway V3 before 3.5.17.10, there is a NULL Pointer Dereference. Crafted communication requests may cause a Null pointer dereference in the affected CODESYS products and may result in a denial-of-service condition.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.01185,"percentile":0.68006,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-476"],"published":"2021-08-04T13:35:31Z","modified":"2026-06-17T03:59:07Z","products":[{"vendor":"codesys","product":"gateway"}],"references":[{"url":"https://customers.codesys.com/index.php?eID=dumpFile\u0026t=f\u0026f=16804\u0026token=d8c89c887979b22fdfc9fd5c3aa3804bbb1ddbff\u0026download=","tags":["x_refsource_CONFIRM","x_transferred","Broken Link"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-36764"},{"url":"https://github.com/advisories/GHSA-qpw7-wx2f-6gc3"}],"sources":{"cve":[{"id":"CVE-2021-36764","description":"In CODESYS Gateway V3 before 3.5.17.10, there is a NULL Pointer Dereference. Crafted communication requests may cause a Null pointer dereference in the affected CODESYS products and may result in a denial-of-service condition.","status":"published","published":"2021-08-04T13:35:31Z","modified":"2024-08-04T01:01:59.256Z","updated_at":"2026-11-02T14:33:05.989686Z"}],"euvd":[{"id":"EUVD-2021-23352","description":"In CODESYS Gateway V3 before 3.5.17.10, there is a NULL Pointer Dereference. Crafted communication requests may cause a Null pointer dereference in the affected CODESYS products and may result in a denial-of-service condition.","status":"published","published":"2021-08-04T13:35:31Z","modified":"2024-08-04T01:01:59Z","updated_at":"2026-11-03T03:24:29.329171Z"}],"ghsa":[{"id":"GHSA-qpw7-wx2f-6gc3","title":"In CODESYS Gateway V3 before 3.5.17.10, there is a NULL Pointer Dereference. Crafted...","description":"In CODESYS Gateway V3 before 3.5.17.10, there is a NULL Pointer Dereference. Crafted communication requests may cause a Null pointer dereference in the affected CODESYS products and may result in a denial-of-service condition.","status":"published","published":"2022-05-24T19:10:00Z","modified":"2023-01-30T05:01:14Z","cwes":["CWE-476"],"updated_at":"2026-11-02T14:46:22.009402Z"}],"nvd":[{"id":"CVE-2021-36764","description":"In CODESYS Gateway V3 before 3.5.17.10, there is a NULL Pointer Dereference. Crafted communication requests may cause a Null pointer dereference in the affected CODESYS products and may result in a denial-of-service condition.","status":"published","published":"2021-08-04T14:15:08.507Z","modified":"2026-06-17T03:59:07.71Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-476"],"updated_at":"2026-11-02T14:06:56.562207Z"}]}}