{"cve":"CVE-2023-40167","nvd":{"published":"2023-09-15T20:15:09.827","modified":"2026-06-17T06:16:31.000","status":"Modified","description":"Jetty is a Java based web server and servlet engine. Prior to versions 9.4.52, 10.0.16, 11.0.16, and 12.0.1, Jetty accepts the `+` character proceeding the content-length value in a HTTP/1 header field.  This is more permissive than allowed by the RFC and other servers routinely reject such requests with 400 responses.  There is no known exploit scenario, but it is conceivable that request smuggling could result if jetty is used in combination with a server that does not close the connection after sending such a 400 response. Versions 9.4.52, 10.0.16, 11.0.16, and 12.0.1 contain a patch for this issue. There is no workaround as there is no known exploit scenario.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","score":5.3},"cwes":["CWE-130"],"references":["https://github.com/eclipse/jetty.project/security/advisories/GHSA-hmr7-m48g-48f6","https://lists.debian.org/debian-lts-announce/2023/09/msg00039.html","https://www.debian.org/security/2023/dsa-5507","https://www.rfc-editor.org/rfc/rfc9110#section-8.6","https://github.com/eclipse/jetty.project/security/advisories/GHSA-hmr7-m48g-48f6"],"products":["debian:debian_linux","eclipse:jetty"],"source":"nvd","synced_at":"2026-10-19T21:39:24.235896374+00:00"},"epss":{"cve":"CVE-2023-40167","score":0.01279,"percentile":0.7,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-hmr7-m48g-48f6","url":"https://osv.dev/vulnerability/GHSA-hmr7-m48g-48f6","summary":"Jetty accepts \"+\" prefixed value in Content-Length","modified":"2026-09-10T03:49:58.471065499Z","packages":[{"ecosystem":"Maven","name":"org.eclipse.jetty:jetty-http","purl":"pkg:maven/org.eclipse.jetty/jetty-http","ranges":[">=9.0.0 <9.4.52"],"fixed":["9.4.52"]},{"ecosystem":"Maven","name":"org.eclipse.jetty:jetty-http","purl":"pkg:maven/org.eclipse.jetty/jetty-http","ranges":[">=10.0.0 <10.0.16"],"fixed":["10.0.16"]},{"ecosystem":"Maven","name":"org.eclipse.jetty:jetty-http","purl":"pkg:maven/org.eclipse.jetty/jetty-http","ranges":[">=11.0.0 <11.0.16"],"fixed":["11.0.16"]},{"ecosystem":"Maven","name":"org.eclipse.jetty:jetty-http","purl":"pkg:maven/org.eclipse.jetty/jetty-http","ranges":[">=12.0.0 <12.0.1"],"fixed":["12.0.1"]}]}],"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."]}