CVE-2025-25193Public exploit

Application crash via uncounted null bytes

Published Feb 10, 2025 · Updated Feb 21, 2025

Denial of service in BoundedInputStream in Netty before 4.1.118.Final allows local users to crash Windows applications. BoundedInputStream treats a zero byte as if no byte were read, so a null-filled environment file bypasses the input limit and makes BufferedReader grow its line buffer. Exploitation requires a local user able to create the probed file on Windows; the resulting memory exhaustion crashes the Netty-based application.

CVSS severity5.5
Medium
EPSS probability0.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in BoundedInputStream in Netty before 4.1.118.Final allows local users to crash Windows applications. BoundedInputStream treats a zero byte as if no byte were read, so a null-filled environment file bypasses the input limit and makes BufferedReader grow its line buffer. Exploitation requires a local user able to create the probed file on Windows; the resulting memory exhaustion crashes the Netty-based application.

The record

CVE
CVE-2025-25193
Published
Feb 10, 2025
Updated
Feb 21, 2025
Vendor
The Netty Project
Product
Netty
Classifications
CWE-400, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 10, 2025CVE publishedPublication date reported by the CVE source.
  2. Feb 21, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=<= 4.1.118

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Netty Project · Nettyversion=<= 4.1.118

Published CVSS scores

5.5GitHubCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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