# CVE-2023-40167: jetty9: Jetty is a Java based web server and servlet engine

CVE-2023-40167 is fixed in jetty9 on 1 platform, first by DEBIAN-CVE-2023-40167, released September 15, 2023. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2023-40167
- Priority: Routine
- CVSS: 5.3 (medium)
- EPSS: 0.0128
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 15, 2023

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | jetty9 Debian 12.15 (bookworm) | 9.4.50-4+deb12u1 | [DEBIAN-CVE-2023-40167](https://patchblox.com/security/data/fix/linux/debian-cve-2023-40167.md) | Sep 15, 2023 |
| Linux | jetty9 Debian 13.5 (trixie) | 9.4.52-1 | [DEBIAN-CVE-2023-40167](https://patchblox.com/security/data/fix/linux/debian-cve-2023-40167.md) | Sep 15, 2023 |
| Linux | jetty9 Debian 14 | 9.4.52-1 | [DEBIAN-CVE-2023-40167](https://patchblox.com/security/data/fix/linux/debian-cve-2023-40167.md) | Sep 15, 2023 |

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