{"schemaVersion":3,"id":"CVE-2020-36048","aliases":["GHSA-j4f2-536g-r55m"],"status":"published","duplicateOf":null,"title":null,"description":"Engine.IO before 4.0.0 allows attackers to cause a denial of service (resource consumption) via a POST request to the long polling transport.","dates":{"published":"2021-01-07T23:24:33.000Z","modified":"2024-08-04T17:16:14.103Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":7.5,"severity":"high","version":"3.1","versionLabel":"v3.1","source":"NVD","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"OSV · Npm","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":10,"impact":6,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":null,"impact":null,"computed":false},{"version":"2.0","versionLabel":"v2.0","source":"NVD","score":5,"severity":"medium","vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.03276,"percentile":0.88269,"severity":"low","asOf":"2026-10-19T00:00:00.000Z","change":{"pp":0.03899999999999945,"baselineDate":"2026-09-19T00:00:00.000Z","baselineScore":0.03237},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.03237,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.03237,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.03237,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.03237,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.03237,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.03237,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.03237,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.03237,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.03237,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.03237,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.03237,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.03237,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.03237,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.03237,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.03237,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.03237,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.03237,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.03237,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.03276,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.03276,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.03276,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.03276,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.03276,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.03276,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.03276,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.03276,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.03276,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.03276,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.03276,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.03276,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.03276,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.03276,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.03276,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.03276,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.03276,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.03276,"percentile":0.88269}],"last30":[{"date":"2026-09-19T00:00:00.000Z","score":0.03237,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.03237,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.03237,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.03237,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.03237,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.03237,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.03237,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.03237,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.03237,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.03237,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.03237,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.03237,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.03237,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.03276,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.03276,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.03276,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.03276,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.03276,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.03276,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.03276,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.03276,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.03276,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.03276,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.03276,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.03276,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.03276,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.03276,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.03276,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.03276,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.03276,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.03276,"percentile":0.88269}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[{"id":"REF_2923AB8A9FD8FF17","name":"Exploit Reference (blog.caller.xyz)","source":"reference","url":"https://blog.caller.xyz/socketio-engineio-dos/","maturity":"unknown","reliabilityScore":0.2,"verified":false,"type":null,"platforms":[],"requiresAuth":null,"exploitdb":null,"metasploit":null}],"exploitCount":1,"weaknesses":[{"id":"CWE-400","name":"Uncontrolled Resource Consumption","description":"The product does not properly control the allocation and maintenance of a limited resource.","type":"weakness","status":"Draft","abstraction":"Class","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/400.html"}],"affected":[{"vendor":"Npm","product":"engine.io","name":"engine.io","label":"engine.io","ecosystem":"Npm","cpePart":null,"purl":"pkg:npm/engine.io","purlType":"npm","versions":[{"text":"< 3.6.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 3.6.0","eol":null,"hubHref":null},{"vendor":"socket","product":"engine.io","name":"engine.io","label":"engine.io","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 4.0.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 4.0.0","eol":null,"hubHref":"/vendor/socket/engineio"}],"affectedCount":2,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://github.com/socketio/engine.io/commit/734f9d1268840722c41219e69eb58318e0b2ac6b","label":"github.com/socketio/engine.io/commit/734f9d1268840722c41219e69eb58318e0b2ac6b","hostname":"github.com","tags":["X Refsource MISC","WEB","Patch","Third Party Advisory"]},{"url":"https://blog.caller.xyz/socketio-engineio-dos/","label":"blog.caller.xyz/socketio-engineio-dos/","hostname":"blog.caller.xyz","tags":["X Refsource MISC","Exploit","Third Party Advisory"]},{"url":"https://github.com/bcaller/kill-engine-io","label":"github.com/bcaller/kill-engine-io","hostname":"github.com","tags":["X Refsource MISC","WEB","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-36048","label":"nvd.nist.gov/vuln/detail/CVE-2020-36048","hostname":"nvd.nist.gov","tags":["Advisory"]},{"url":"https://github.com/socketio/engine.io/commit/58e274c437e9cbcf69fd913c813aad8fbd253703","label":"github.com/socketio/engine.io/commit/58e274c437e9cbcf69fd913c813aad8fbd253703","hostname":"github.com","tags":["WEB"]},{"url":"https://blog.caller.xyz/socketio-engineio-dos","label":"blog.caller.xyz/socketio-engineio-dos","hostname":"blog.caller.xyz","tags":["WEB"]},{"url":"https://github.com/socketio/engine.io","label":"github.com/socketio/engine.io","hostname":"github.com","tags":["PACKAGE"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2021-01-07T23:24:33.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2024-08-04T17:16:14.103Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":41,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-19T20:57:44.952Z","stale":false,"partial":false}}