{"api_version":"1","generated_at":"2026-07-23T08:55:36+00:00","cve":"CVE-2018-11518","urls":{"html":"https://cve.report/CVE-2018-11518","api":"https://cve.report/api/cve/CVE-2018-11518.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2018-11518","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2018-11518"},"summary":{"title":"CVE-2018-11518","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).","state":"PUBLIC","assigner":"cve@mitre.org","published_at":"2018-05-30 20:29:00","updated_at":"2018-07-20 16:10:00"},"problem_types":["CWE-20"],"metrics":[],"references":[{"url":"https://twitter.com/mishradhiraj_/status/1001664440759091207","name":"https://twitter.com/mishradhiraj_/status/1001664440759091207","refsource":"MISC","tags":["Third Party Advisory"],"title":"Dhiraj 的 Twitter: “The IVR nowadays includes multiple functionalities like recharges and subscriptions for services which can also be done even with modern Telecom operators.\n#DiggingOldSys… https://t.co/QBdbZUiEli”","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"http://virgil-cj.blogspot.com/2018/05/0day-legacy-ivr-lets-phreak.html","name":"http://virgil-cj.blogspot.com/2018/05/0day-legacy-ivr-lets-phreak.html","refsource":"MISC","tags":["Third Party Advisory"],"title":"A Virgil's Guide to Pentest: 0day - Legacy IVR - Let's Phreak","mime":"text/html","httpstatus":"200","archivestatus":"0"},{"url":"https://datarift.blogspot.com/2018/05/CVE-2018-11518-abusing-ivr-systems.html","name":"https://datarift.blogspot.com/2018/05/CVE-2018-11518-abusing-ivr-systems.html","refsource":"MISC","tags":["Third Party Advisory"],"title":"Abusing IVR Systems - Legacy Telecom [CVE-2018-11518] ~ inputzero","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://twitter.com/mishradhiraj_/status/1001664204485652482","name":"https://twitter.com/mishradhiraj_/status/1001664204485652482","refsource":"MISC","tags":["Third Party Advisory"],"title":"Dhiraj op Twitter: \"Yes there is no boundry crossing here and it does follow the flow but the flow is controlled by someone else not the user who has initiated the call. Select 1 for English is just an example to show we can control other users flow without their consent. 1/n… https://t.co/rTME60EolO\"","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://www.cve.org/CVERecord?id=CVE-2018-11518","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2018-11518","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2018","cve_id":"11518","vulnerable":"-1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"h","cpe4":"hcltech","cpe5":"legacy_ivr","cpe6":"-","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2018","cve_id":"11518","vulnerable":"0","versionEndIncluding":"1","cpe1":"cpe","cpe2":"2.3","cpe3":"h","cpe4":"hcltech","cpe5":"legacy_ivr","cpe6":"-","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2018","cve_id":"11518","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"hcltech","cpe5":"legacy_ivr_firmware","cpe6":"-","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2018","cve_id":"11518","vulnerable":"1","versionEndIncluding":"1","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"hcltech","cpe5":"legacy_ivr_firmware","cpe6":"-","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"CVE_data_meta":{"ASSIGNER":"cve@mitre.org","ID":"CVE-2018-11518","STATE":"PUBLIC"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"n/a","version":{"version_data":[{"version_value":"n/a"}]}}]},"vendor_name":"n/a"}]}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"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)."}]},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"n/a"}]}]},"references":{"reference_data":[{"name":"https://twitter.com/mishradhiraj_/status/1001664440759091207","refsource":"MISC","url":"https://twitter.com/mishradhiraj_/status/1001664440759091207"},{"name":"https://datarift.blogspot.com/2018/05/CVE-2018-11518-abusing-ivr-systems.html","refsource":"MISC","url":"https://datarift.blogspot.com/2018/05/CVE-2018-11518-abusing-ivr-systems.html"},{"name":"http://virgil-cj.blogspot.com/2018/05/0day-legacy-ivr-lets-phreak.html","refsource":"MISC","url":"http://virgil-cj.blogspot.com/2018/05/0day-legacy-ivr-lets-phreak.html"},{"name":"https://twitter.com/mishradhiraj_/status/1001664204485652482","refsource":"MISC","url":"https://twitter.com/mishradhiraj_/status/1001664204485652482"}]}},"nvd":{"publishedDate":"2018-05-30 20:29:00","lastModifiedDate":"2018-07-20 16:10:00","problem_types":["CWE-20"],"metrics":{"baseMetricV3":{"cvssV3":{"version":"3.0","vectorString":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH","baseScore":8.1,"baseSeverity":"HIGH"},"exploitabilityScore":2.2,"impactScore":5.9},"baseMetricV2":{"cvssV2":{"version":"2.0","vectorString":"AV:N/AC:M/Au:N/C:P/I:P/A:P","accessVector":"NETWORK","accessComplexity":"MEDIUM","authentication":"NONE","confidentialityImpact":"PARTIAL","integrityImpact":"PARTIAL","availabilityImpact":"PARTIAL","baseScore":6.8},"severity":"MEDIUM","exploitabilityScore":8.6,"impactScore":6.4,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":false,"userInteractionRequired":false}},"configurations":{"CVE_data_version":"4.0","nodes":[{"operator":"AND","children":[{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:o:hcltech:legacy_ivr_firmware:-:*:*:*:*:*:*:*","cpe_name":[]}]},{"operator":"OR","children":[],"cpe_match":[{"vulnerable":false,"cpe23Uri":"cpe:2.3:h:hcltech:legacy_ivr:-:*:*:*:*:*:*:*","cpe_name":[]}]}],"cpe_match":[]}]}},"legacy_mitre":{"record":{"CveYear":"2018","CveId":"11518","Ordinal":"127995","Title":"CVE-2018-11518","CVE":"CVE-2018-11518","Year":"2018"},"notes":[{"CveYear":"2018","CveId":"11518","Ordinal":"1","NoteData":"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).","Type":"Description","Title":null},{"CveYear":"2018","CveId":"11518","Ordinal":"2","NoteData":"2018-05-30","Type":"Other","Title":"Published"},{"CveYear":"2018","CveId":"11518","Ordinal":"3","NoteData":"2018-05-30","Type":"Other","Title":"Modified"}]}}}