{"api_version":"1","generated_at":"2026-04-23T04:33:57+00:00","cve":"CVE-2020-14000","urls":{"html":"https://cve.report/CVE-2020-14000","api":"https://cve.report/api/cve/CVE-2020-14000.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2020-14000","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2020-14000"},"summary":{"title":"CVE-2020-14000","description":"MIT Lifelong Kindergarten Scratch scratch-vm before 0.2.0-prerelease.20200714185213 loads extension URLs from untrusted project.json files with certain _ characters, resulting in remote code execution because the URL's content is treated as a script and is executed as a worker. The responsible code is getExtensionIdForOpcode in serialization/sb3.js. The use of _ is incompatible with a protection mechanism in older versions, in which URLs were split and consequently deserialization attacks were prevented. NOTE: the scratch.mit.edu hosted service is not affected because of the lack of worker scripts.","state":"PUBLIC","assigner":"cve@mitre.org","published_at":"2020-07-16 15:15:00","updated_at":"2020-07-24 15:02:00"},"problem_types":["CWE-502"],"metrics":[],"references":[{"url":"https://github.com/LLK/scratch-vm/pull/2476","name":"https://github.com/LLK/scratch-vm/pull/2476","refsource":"CONFIRM","tags":["Third Party Advisory"],"title":"sanitize extension ID in getExtensionIdForOpcode by cwillisf · Pull Request #2476 · LLK/scratch-vm · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://scratch.mit.edu/discuss/topic/422904/?page=1#post-4223443","name":"https://scratch.mit.edu/discuss/topic/422904/?page=1#post-4223443","refsource":"CONFIRM","tags":["Vendor Advisory"],"title":"CVE-2020-14000: Script Injection vulnerability in scratch-vm - Discuss Scratch","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://www.cve.org/CVERecord?id=CVE-2020-14000","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-14000","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2020","cve_id":"14000","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"mit","cpe5":"scratch-vm","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2020","cve_id":"14000","vulnerable":"1","versionEndIncluding":"1","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"mit","cpe5":"scratch-vm","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[{"cve":"CVE-2020-14000","qid":"980744","title":"Nodejs (npm) Security Update for scratch-vm (GHSA-vc9j-fhvv-8vrf)"}]},"source_records":{"cve_program":{"CVE_data_meta":{"ASSIGNER":"cve@mitre.org","ID":"CVE-2020-14000","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":"MIT Lifelong Kindergarten Scratch scratch-vm before 0.2.0-prerelease.20200714185213 loads extension URLs from untrusted project.json files with certain _ characters, resulting in remote code execution because the URL's content is treated as a script and is executed as a worker. The responsible code is getExtensionIdForOpcode in serialization/sb3.js. The use of _ is incompatible with a protection mechanism in older versions, in which URLs were split and consequently deserialization attacks were prevented. NOTE: the scratch.mit.edu hosted service is not affected because of the lack of worker scripts."}]},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"n/a"}]}]},"references":{"reference_data":[{"refsource":"CONFIRM","name":"https://github.com/LLK/scratch-vm/pull/2476","url":"https://github.com/LLK/scratch-vm/pull/2476"},{"refsource":"CONFIRM","name":"https://scratch.mit.edu/discuss/topic/422904/?page=1#post-4223443","url":"https://scratch.mit.edu/discuss/topic/422904/?page=1#post-4223443"}]}},"nvd":{"publishedDate":"2020-07-16 15:15:00","lastModifiedDate":"2020-07-24 15:02:00","problem_types":["CWE-502"],"metrics":{"baseMetricV3":{"cvssV3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH","baseScore":9.8,"baseSeverity":"CRITICAL"},"exploitabilityScore":3.9,"impactScore":5.9},"baseMetricV2":{"cvssV2":{"version":"2.0","vectorString":"AV:N/AC:L/Au:N/C:P/I:P/A:P","accessVector":"NETWORK","accessComplexity":"LOW","authentication":"NONE","confidentialityImpact":"PARTIAL","integrityImpact":"PARTIAL","availabilityImpact":"PARTIAL","baseScore":7.5},"severity":"HIGH","exploitabilityScore":10,"impactScore":6.4,"acInsufInfo":false,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":false,"userInteractionRequired":false}},"configurations":{"CVE_data_version":"4.0","nodes":[{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:mit:scratch-vm:*:*:*:*:*:*:*:*","versionEndExcluding":"0.2.0-prerelease.20200714185213","cpe_name":[]}]}]}},"legacy_mitre":{"record":{"CveYear":"2020","CveId":"14000","Ordinal":"175226","Title":"CVE-2020-14000","CVE":"CVE-2020-14000","Year":"2020"},"notes":[{"CveYear":"2020","CveId":"14000","Ordinal":"1","NoteData":"MIT Lifelong Kindergarten Scratch scratch-vm before 0.2.0-prerelease.20200714185213 loads extension URLs from untrusted project.json files with certain _ characters, resulting in remote code execution because the URL's content is treated as a script and is executed as a worker. The responsible code is getExtensionIdForOpcode in serialization/sb3.js. The use of _ is incompatible with a protection mechanism in older versions, in which URLs were split and consequently deserialization attacks were prevented. NOTE: the scratch.mit.edu hosted service is not affected because of the lack of worker scripts.","Type":"Description","Title":null},{"CveYear":"2020","CveId":"14000","Ordinal":"2","NoteData":"2020-07-16","Type":"Other","Title":"Published"},{"CveYear":"2020","CveId":"14000","Ordinal":"3","NoteData":"2020-07-16","Type":"Other","Title":"Modified"}]}}}