{"id":"CVE-2021-23339","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-23339","generatedAt":"2026-10-27T22:32:09.345Z","title":"It allows multiple Transfer-Encoding headers.","description":"This affects all versions before 10.1.14 and from 10.2.0 to 10.2.4 of package com.typesafe.akka:akka-http-core. It allows multiple Transfer-Encoding headers.","published":"2021-02-17T08:15:11.000Z","lastModified":"2026-06-17T03:38:35.000Z","status":"Modified","sourceIdentifier":"report@snyk.io","cvss":{"version":"3.1","score":6.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"},"cwe":["CWE-444"],"affected":["lightbend/akka-http"],"epss":{"score":0.00711,"percentile":0.5329,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.71%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://github.com/akka/akka-http/pull/3754%23issuecomment-779265201","tags":["Broken Link"],"source":"report@snyk.io"},{"url":"https://snyk.io/vuln/SNYK-JAVA-COMTYPESAFEAKKA-1075043","tags":["Broken Link"],"source":"report@snyk.io"},{"url":"https://github.com/akka/akka-http/pull/3754%23issuecomment-779265201","tags":["Broken Link"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://snyk.io/vuln/SNYK-JAVA-COMTYPESAFEAKKA-1075043","tags":["Broken Link"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-23339","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}