{"cve":"CVE-2021-23339","nvd":{"published":"2021-02-17T08:15:11.330","modified":"2026-06-17T03:38:35.053","status":"Modified","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","score":6.5},"cwes":["CWE-444"],"references":["https://github.com/akka/akka-http/pull/3754%23issuecomment-779265201","https://snyk.io/vuln/SNYK-JAVA-COMTYPESAFEAKKA-1075043","https://github.com/akka/akka-http/pull/3754%23issuecomment-779265201","https://snyk.io/vuln/SNYK-JAVA-COMTYPESAFEAKKA-1075043"],"products":["lightbend:akka-http"],"source":"nvd","synced_at":"2026-10-19T21:15:50.279857260+00:00"},"epss":{"cve":"CVE-2021-23339","score":0.00711,"percentile":0.53577,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-2w7w-2j92-44hx","url":"https://osv.dev/vulnerability/GHSA-2w7w-2j92-44hx","summary":"HTTP Request Smuggling in akka-http-core","modified":"2026-07-08T06:49:40.385170912Z","packages":[{"ecosystem":"Maven","name":"com.typesafe.akka:akka-http-core","purl":"pkg:maven/com.typesafe.akka/akka-http-core","ranges":[">=10.2.0 <10.2.4"],"fixed":["10.2.4"]},{"ecosystem":"Maven","name":"com.typesafe.akka:akka-http-core","purl":"pkg:maven/com.typesafe.akka/akka-http-core","ranges":["<10.1.14"],"fixed":["10.1.14"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}