{"schemaVersion":3,"id":"CVE-2018-11518","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"A vulnerability allows a phreaking attack on HCL legacy IVR systems that do not use VoIP. These IVR systems rely on various frequencies of audio signals; based on the frequency, certain commands and functions are processed. Since these frequencies are accepted within a phone call, an attacker can record these frequencies and use them for service activations. This is a request-forgery issue when the required series of DTMF signals for a service activation is predictable (e.g., the IVR system does not speak a nonce to the caller). In this case, the IVR system accepts an activation request from a less-secure channel (any loudspeaker in the caller's physical environment) without verifying that the request was intended (it matches a nonce sent over a more-secure channel to the caller's earpiece).","dates":{"published":"2018-05-30T20:00:00.000Z","modified":"2024-08-05T08:10:14.610Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":8.1,"severity":"high","version":"3.0","versionLabel":"v3.0","source":"NVD","vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.0","versionLabel":"v3.0","source":"NVD","score":8.1,"severity":"high","vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false},{"version":"2.0","versionLabel":"v2.0","source":"NVD","score":6.8,"severity":"medium","vector":"AV:N/AC:M/Au:N/C:P/I:P/A:P","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.01398,"percentile":0.71979,"severity":"low","asOf":"2026-10-18T00:00:00.000Z","change":{"pp":-0.022000000000000144,"baselineDate":"2026-09-18T00:00:00.000Z","baselineScore":0.0142},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.0142,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.0142,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.0142,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.0142,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.0142,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.0142,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.0142,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.01302,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.0142,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.0142,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.0142,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.0142,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.0142,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.0142,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.0142,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.0142,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.0142,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.0142,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.0142,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.0142,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.0142,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.0142,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.01398,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.01398,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.01398,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.01398,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.01398,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.01398,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.01398,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.01398,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.01398,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.01398,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.01398,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.01398,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.01398,"percentile":0.71979}],"last30":[{"date":"2026-09-18T00:00:00.000Z","score":0.0142,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.0142,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.0142,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.01302,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.0142,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.0142,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.0142,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.0142,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.0142,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.0142,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.0142,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.0142,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.0142,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.0142,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.0142,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.0142,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.0142,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.0142,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.01398,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.01398,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.01398,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.01398,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.01398,"percentile":null},{"date":"2026-1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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":"hcltech","product":"legacy_ivr_firmware","name":"legacy ivr firmware","label":"legacy_ivr_firmware","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"na","noFixRecorded":false,"fixedIn":null}],"versionsText":"na","eol":null,"hubHref":"/vendor/hcltech/legacy_ivr"}],"affectedCount":1,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://twitter.com/mishradhiraj_/status/1001664440759091207","label":"twitter.com/mishradhiraj_/status/1001664440759091207","hostname":"twitter.com","tags":["X Refsource MISC","Third Party Advisory"]},{"url":"https://datarift.blogspot.com/2018/05/CVE-2018-11518-abusing-ivr-systems.html","label":"datarift.blogspot.com/2018/05/CVE-2018-11518-abusing-ivr-systems.html","hostname":"datarift.blogspot.com","tags":["X Refsource MISC","Third Party Advisory"]},{"url":"http://virgil-cj.blogspot.com/2018/05/0day-legacy-ivr-lets-phreak.html","label":"virgil-cj.blogspot.com/2018/05/0day-legacy-ivr-lets-phreak.html","hostname":"virgil-cj.blogspot.com","tags":["X Refsource MISC","Third Party Advisory"]},{"url":"https://twitter.com/mishradhiraj_/status/1001664204485652482","label":"twitter.com/mishradhiraj_/status/1001664204485652482","hostname":"twitter.com","tags":["X Refsource MISC","Third Party Advisory"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2018-05-30T20:00:00.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2024-08-05T08:10:14.610Z","label":"Last 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