{"schemaVersion":3,"id":"CVE-2018-19417","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"An issue was discovered in the MQTT server in Contiki-NG before 4.2. The function parse_publish_vhdr() that parses MQTT PUBLISH messages with a variable length header uses memcpy to input data into a fixed size buffer. The allocated buffer can fit only MQTT_MAX_TOPIC_LENGTH (default 64) bytes, and a length check is missing. This could lead to Remote Code Execution via a stack-smashing attack (overwriting the function return address). Contiki-NG does not separate the MQTT server from other servers and the OS modules, so access to all memory regions is possible.","dates":{"published":"2018-11-21T19:00:00.000Z","modified":"2024-08-05T11:37:10.864Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":10,"severity":"critical","version":"3.0","versionLabel":"v3.0","source":"NVD","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.0","versionLabel":"v3.0","source":"NVD","score":10,"severity":"critical","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false},{"version":"2.0","versionLabel":"v2.0","source":"NVD","score":10,"severity":"high","vector":"AV:N/AC:L/Au:N/C:C/I:C/A:C","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.05692,"percentile":0.92929,"severity":"low","asOf":"2026-10-20T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-20T00:00:00.000Z","baselineScore":0.05692},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.05692,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.05692,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.05692,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.05692,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.05692,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.05692,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.05692,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.0537,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.05692,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.05692,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.05692,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.05692,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.05692,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.05692,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.05692,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.05692,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.05692,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.05692,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.05692,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.05692,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.05692,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.05692,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.05692,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.05692,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.05692,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.05692,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.05692,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.05692,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.05692,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.05692,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.05692,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.05692,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.05692,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.05692,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.05692,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.05692,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.05692,"percentile":0.92929}],"last30":[{"date":"2026-09-20T00:00:00.000Z","score":0.05692,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.0537,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.05692,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.05692,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.05692,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.05692,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.05692,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.05692,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.05692,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.05692,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.05692,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.05692,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.05692,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.05692,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.05692,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.05692,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.05692,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.05692,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.05692,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.05692,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.05692,"percentile":nu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Ng","source":"github","url":"https://github.com/contiki-ng/contiki-ng/issues/594","maturity":"poc","reliabilityScore":0.3,"verified":false,"type":null,"platforms":[],"requiresAuth":null,"exploitdb":null,"metasploit":null}],"exploitCount":1,"weaknesses":[{"id":"CWE-119","name":"Improper Restriction of Operations within the Bounds of a Memory Buffer","description":"The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.","type":"weakness","status":"Stable","abstraction":"Class","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/119.html"}],"affected":[{"vendor":"contiki-ng","product":"contiki-ng","name":"contiki-ng","label":"contiki-ng","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"< 4.2","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 4.2","eol":null,"hubHref":"/vendor/contiki-ng/contiki-ng"}],"affectedCount":1,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://github.com/contiki-ng/contiki-ng/issues/600","label":"github.com/contiki-ng/contiki-ng/issues/600","hostname":"github.com","tags":["X Refsource MISC","Exploit","Third Party Advisory"]}],"lineage":{"upstream":[],"downstream":["MGASA-2019-0168"],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2018-11-21T19:00:00.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2024-08-05T11:37:10.864Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":90,"level":"critical","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-21T01:26:27.006Z","stale":false,"partial":false}}