{"schemaVersion":3,"id":"CVE-2020-17439","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"An issue was discovered in uIP 1.0, as used in Contiki 3.0 and other products. The code that parses incoming DNS packets does not validate that the incoming DNS replies match outgoing DNS queries in newdata() in resolv.c. Also, arbitrary DNS replies are parsed if there was any outgoing DNS query with a transaction ID that matches the transaction ID of an incoming reply. Provided that the default DNS cache is quite small (only four records) and that the transaction ID has a very limited set of values that is quite easy to guess, this can lead to DNS cache poisoning.","dates":{"published":"2020-12-11T22:26:47.000Z","modified":"2024-08-04T13:53:17.466Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":8.3,"severity":"high","version":"3.1","versionLabel":"v3.1","source":"NVD","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":8.3,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L","exploitability":null,"impact":null,"computed":false},{"version":"2.0","versionLabel":"v2.0","source":"NVD","score":7.5,"severity":"high","vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.03183,"percentile":0.87968,"severity":"low","asOf":"2026-10-21T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-21T00:00:00.000Z","baselineScore":0.03183},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.03183,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.03183,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.03183,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.03183,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.03183,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.03183,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.03183,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.03183,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.03183,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.03183,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.03183,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.03183,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.03183,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.03183,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.03183,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.03183,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.03183,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.03183,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.03183,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.03183,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.03183,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.03183,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.03183,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.03183,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.03183,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.03183,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.03183,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.03183,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.03183,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.03183,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.03183,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.03183,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.03183,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.03183,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.03183,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.03183,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.03183,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.03183,"percentile":0.87968}],"last30":[{"date":"2026-09-21T00:00:00.000Z","score":0.03183,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.03183,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.03183,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.03183,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.03183,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.03183,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.03183,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.03183,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.03183,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.03183,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.03183,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.03183,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.03183,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.03183,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.03183,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.03183,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.03183,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.03183,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.03183,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.03183,"percentile":null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Input Validation","description":"The product receives input or data, but it does\n        not validate or incorrectly validates that the input has the\n        properties that are required to process the data safely and\n        correctly.","type":"weakness","status":"Stable","abstraction":"Class","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/20.html"}],"affected":[{"vendor":"uip_project","product":"uip","name":"uip","label":"uip","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"1.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"1.0","eol":null,"hubHref":"/vendor/uip_project/uip"}],"affectedCount":1,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://www.kb.cert.org/vuls/id/815128","label":"www.kb.cert.org/vuls/id/815128","hostname":"www.kb.cert.org","tags":["X Refsource MISC","Third Party Advisory","US Government Resource"]},{"url":"https://us-cert.cisa.gov/ics/advisories/icsa-20-343-01","label":"us-cert.cisa.gov/ics/advisories/icsa-20-343-01","hostname":"us-cert.cisa.gov","tags":["X Refsource MISC","Third Party Advisory","US Government Resource"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2020-12-11T22:26:47.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2024-08-04T13:53:17.466Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":34,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-22T10:05:17.238Z","stale":false,"partial":false}}