# CVE-2017-12165: libundertow-java: It was discovered that Undertow before 1.4.17, 1.3.31 and 2.0.0 processes http request headers with unusual whitespac...

CVE-2017-12165 is fixed in libundertow-java on 1 platform by libundertow-java 2.0.23-1 (version 2.0.23-1), released July 25, 2019. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2017-12165
- Priority: Routine
- CVSS: n/a (Medium)
- EPSS: 0.0186
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 27, 2018

## Description

It was discovered that Undertow before 1.4.17, 1.3.31 and 2.0.0 processes http request headers with unusual whitespaces which can cause possible http request smuggling.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libundertow-java Ubuntu 20.04 LTS (focal) | 2.0.23-1 | [libundertow-java 2.0.23-1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libundertow-java-2.0.23-1.md) | Jul 25, 2019 |

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Data as of 2026-11-07T18:46:35Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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