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Fencer Vulns
medium 6.5

CVE-2020-5404 json

Authentication Leak On Redirect With Reactor Netty HttpClient

published 2020-03-03 6 y ago modified 2026-09-04 2 mo ago also GHSA-gpch-h32j-gx6x , EUVD-2022-1019

cvss
6.5
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 51%
public exploits
0
none known

Summary

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.

Patch / fix

  • maven io.projectreactor.netty:reactor-netty-http 0.8.16, 0.9.5
  • Pivotal Reactor Netty v0.8.16.RELEASE, v0.9.5.RELEASE

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-5404 updated cvss 5.9

reactor-netty: specific redirect configuration allows for a credentials leak

  • Red Hat Text-Only RHOAR
    fixed: vendor fix RHSA-2022:8761
  • Red Hat Integration Camel K 1 reactor-netty reactor-netty
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.66% chance of exploitation in the next 30 days, higher than 51% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.0 6.5 CVSS:3.0/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:L/A:N
NVD 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:N
NVD 2.0 4.9 AV:N/AC:M/Au:S/C:P/I:P/A:N
GitHub 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:N

Affected packages

ecosystem package affected fixed in
maven io.projectreactor.netty:reactor-netty-http
>=0.9.0, <0.9.5
>=0.8.0, <0.8.16
0.9.5
0.8.16

Affected products

  • Pivotal Reactor Netty

Classification

Weakness
  • CWE-522 Insufficiently Protected Credentials

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.