What’s Vulnerable › Vulnerabilities

CVE-2025-25193: Denial of Service attack on windows app using Netty

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-02-10 · updated 2026-06-17
• Weakness: CWE-400

Description

Netty, an asynchronous, event-driven network application framework, has a vulnerability in versions up to and including 4.1.118.Final. An unsafe reading of environment file could potentially cause a denial of service in Netty. When loaded on an Windows application, Netty attempts to load a file that does not exist. If an attacker creates such a large file, the Netty application crash. A similar issue was previously reported as CVE-2024-47535. This issue was fixed, but the fix was incomplete in that null-bytes were not counted against the input limit. Commit d1fbda62d3a47835d3fb35db8bd42ecc205a5386 contains an updated fix.

Affected products

• netty: before 4.1.118 — fixed in 4.1.118

How to fix

Upgrade to a fixed version: netty 4.1.118. Check the vendor advisory for mitigations.

References

• https://github.com/netty/netty/commit/d1fbda62d3a47835d3fb35db8bd42ecc205a5386
• https://github.com/netty/netty/security/advisories/GHSA-389x-839f-4rhx
• https://security.netapp.com/advisory/ntap-20250221-0006/
• https://github.com/netty/netty/security/advisories/GHSA-389x-839f-4rhx

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