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CVE-2025-22227VulnerabilityPublished 07/16/2025Updated 06/23/2026

CVE-2025-22227: Vulnerability in VMware Reactor Netty

Affects VMware Reactor NettySource CVE Database V5

0

Not known to be exploited · CVSS 6.1 Medium.

Data as of 10/25/2026, 04:40:09 UTC

CVSS 3.1 base score
6.1Medium
How severe the flaw is on the 0–10 CVSS scale.
Exploitation

Not in CISA KEV, no exploitation reported

EPSS
0.4% chance of exploitation in 30 days – higher than 33% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

What to do

Affected software

ProductAffectedFixed in
VMwareReactor NettyAffected
  • =>=1.0.0 <1.1.0
  • =>=1.1.0 <1.2.0
  • =>=1.2.0 <1.3.0
  • =>=1.3.0 <1.4.0
Fixed in
  • 1.0.49 (Reactor BOM 2020.0.48)
  • 1.1.32 (Reactor BOM 2022.0.27 and 2023.0.20)
  • 1.2.8 (Reactor BOM 2024.0.8)
  • 1.3.0-M5 (Reactor BOM 2025.0.0-M5)
Mavenio.projectreactor/reactor-nettypkg:maven/io.projectreactor/reactor-nettyOther threatsAffected
  • >=1.0.0 <1.1.0
  • >=1.1.0 <1.2.0
  • >=1.2.0 <1.3.0
  • >=1.3.0 <1.4.0
Fixed in
  • 1.1.0
  • 1.2.0
  • 1.3.0
  • 1.4.0

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Until a fix is available, avoid configuring the Reactor Netty HTTP client to follow redirects if possible, or carefully control and validate redirect targets to minimize credential exposure risk.

Description

In some specific scenarios with chained redirects, Reactor Netty HTTP client leaks credentials. In order for this to happen, the HTTP client must have been explicitly configured to follow redirects.

Impact

An attacker could potentially obtain leaked credentials during chained HTTP redirects if the client is configured to follow redirects. This leads to a confidentiality breach with limited impact on integrity and no impact on availability. No active exploitation has been reported.

Weaknesses

References

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