🛡️ CVE-2025-25193 — netty

🟡 CVSS 5.5 — Medium ✅ No Known Exploit CWE-400 NVD
5.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Denial of Service attack on windows app using Netty

Summary

An unsafe reading of environment file could potentially cause a denial of service in Netty.

When loaded on an Windows application, Netty attemps to load a file that does not exist. If an attacker creates such a large file, the Netty application crash.

Details

A similar issue was previously reported in https://github.com/netty/netty/security/advisories/GHSA-xq3w-v528-46rv

This issue was fixed, but the fix was incomplete in that null-bytes were not counted against the input limit.

PoC

The PoC is the same as for https://github.com/netty/netty/security/advisories/GHSA-xq3w-v528-46rv with the detail that the file should only contain null-bytes; 0x00.

When the null-bytes are encountered by the InputStreamReader, it will issue replacement characters in its charset decoding, which will fill up the line-buffer in the BufferedReader.readLine(), because the replacement character is not a line-break character.

Impact

Impact is the same as https://github.com/netty/netty/security/advisories/GHSA-xq3w-v528-46rv

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

Weakness class

CVE-2025-25193 is classified as CWE-400: Uncontrolled Resource Consumption. A request can consume memory, CPU or storage without limit, exhausting capacity for everyone else.

Affected software

CVE-2025-25193 is recorded against 2 packages.

  • io.netty:netty-common (fixed in 4.1.118.Final)
  • netty (fixed in 4.1.118)

Timeline and source

Published on 10 February 2025 and last revised on 4 February 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

github.com (Web)
nvd.nist.gov (Advisory)
github.com (Web)
github.com (Package)
security.netapp.com (Web)

CVE-2025-25193 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Medium
CVSS Score 5.5
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE CWE-400
Public Exploit ✅ No
Source NVD
Published 2025-02-10
Updated 2026-08-12
Modified 2026-02-04

Affected Packages

Software From version Fixed in
io.netty:netty-common — 4.1.118.Final
netty — 4.1.118

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