{"id":"CVE-2024-40493","aliases":["EUVD-2024-38480","GHSA-cr59-3vcq-rrw6"],"status":"published","title":"Null Pointer Dereference in `coap_client_exchange_blockwise2` function in Keith Cullen FreeCoAP 1...","description":"Null Pointer Dereference in `coap_client_exchange_blockwise2` function in Keith Cullen FreeCoAP 1.0 allows remote attackers to cause a denial of service and potentially execute arbitrary code via a specially crafted CoAP packet that causes `coap_msg_get_payload(resp)` to return a null pointer, which is then dereferenced in a call to `memcpy`.","severity":{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-11","score":0.00784,"percentile":0.56499,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-476"],"published":"2024-10-22T00:00:00Z","modified":"2026-06-17T07:45:58Z","products":[{"vendor":"keith-cullen","product":"freecoap"},{"vendor":"keithcullen","product":"freecoap"}],"references":[{"url":"https://github.com/keith-cullen/FreeCoAP/issues/37","tags":["Exploit","Issue Tracking"]},{"url":"https://gist.github.com/dqp10515/fe80005e2fb58ed8ada178ac017e4ad4","tags":["Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2024-40493"},{"url":"https://github.com/advisories/GHSA-cr59-3vcq-rrw6"}],"sources":{"cve":[{"id":"CVE-2024-40493","description":"Null Pointer Dereference in `coap_client_exchange_blockwise2` function in Keith Cullen FreeCoAP 1.0 allows remote attackers to cause a denial of service and potentially execute arbitrary code via a specially crafted CoAP packet that causes `coap_msg_get_payload(resp)` to return a null pointer, which is then dereferenced in a call to `memcpy`.","status":"published","published":"2024-10-22T00:00:00Z","modified":"2024-10-23T15:50:04.486Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"adp"}],"cwes":["CWE-476"],"updated_at":"2026-11-02T14:34:06.811965Z"}],"euvd":[{"id":"EUVD-2024-38480","description":"Null Pointer Dereference in `coap_client_exchange_blockwise2` function in Keith Cullen FreeCoAP 1.0 allows remote attackers to cause a denial of service and potentially execute arbitrary code via a specially crafted CoAP packet that causes `coap_msg_get_payload(resp)` to return a null pointer, which is then dereferenced in a call to `memcpy`.","status":"published","published":"2024-10-22T00:00:00Z","modified":"2024-10-23T15:50:04Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-03T00:05:21.011532Z"}],"ghsa":[{"id":"GHSA-cr59-3vcq-rrw6","title":"Null Pointer Dereference in `coap_client_exchange_blockwise2` function in Keith Cullen FreeCoAP 1...","description":"Null Pointer Dereference in `coap_client_exchange_blockwise2` function in Keith Cullen FreeCoAP 1.0 allows remote attackers to cause a denial of service and potentially execute arbitrary code via a specially crafted CoAP packet that causes `coap_msg_get_payload(resp)` to return a null pointer, which is then dereferenced in a call to `memcpy`.","status":"published","published":"2024-10-23T00:31:43Z","modified":"2024-10-23T18:34:12Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"cwes":["CWE-476"],"updated_at":"2026-11-02T14:58:35.380011Z"}],"nvd":[{"id":"CVE-2024-40493","description":"Null Pointer Dereference in `coap_client_exchange_blockwise2` function in Keith Cullen FreeCoAP 1.0 allows remote attackers to cause a denial of service and potentially execute arbitrary code via a specially crafted CoAP packet that causes `coap_msg_get_payload(resp)` to return a null pointer, which is then dereferenced in a call to `memcpy`.","status":"published","published":"2024-10-22T22:15:04.407Z","modified":"2026-06-17T07:45:58.527Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"secondary"}],"cwes":["CWE-476"],"updated_at":"2026-11-02T14:10:33.928543Z"}]}}